Received: (at 74760) by debbugs.gnu.org; 10 Dec 2024 18:42:14 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Dec 10 13:42:14 2024 Received: from localhost ([127.0.0.1]:59559 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1tL5BW-0005qk-8d for submit <at> debbugs.gnu.org; Tue, 10 Dec 2024 13:42:14 -0500 Received: from mail-pj1-f54.google.com ([209.85.216.54]:42434) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <tingbg@HIDDEN>) id 1tL5BT-0005qb-T3 for 74760 <at> debbugs.gnu.org; Tue, 10 Dec 2024 13:42:12 -0500 Received: by mail-pj1-f54.google.com with SMTP id 98e67ed59e1d1-2ee76929a98so4632049a91.1 for <74760 <at> debbugs.gnu.org>; Tue, 10 Dec 2024 10:42:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1733856071; x=1734460871; darn=debbugs.gnu.org; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=n0/+tFtyNlZBDQLCXh4X8iKMmIFk43zd6LbB//yoixI=; b=RXVCBKpPrfoiZCe7NVSVkxGZbgCW0H2cwx51GjR/L3XyjgrmS2gS4ocD0EwRKykDr8 ChWL5/Ndv318S3g3e1Whh200LVxVQUa8b/zHkvMzOJyFva4YPrfoSeYmpSzrH586Z/q7 XIAPtYAiBANzki17CyYbk6H+tcAf/uAj01F1cKFXdhmgkMiRbuVKiz87td+ayA6G1SoJ kuAUl0lf1kiKan5y4TmMDzdahLPeNPQeZ8qpy7r8GGYe8Y/ovlZIGSORIdfs5Oi0Mcxr weSSGie/5/CPJ/R6RS+zEaQ6Keug6nK4R4zNWQ0p7O+AL9MVz5lh+xQE4IK+3wVhdHY8 LIIA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1733856071; x=1734460871; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=n0/+tFtyNlZBDQLCXh4X8iKMmIFk43zd6LbB//yoixI=; b=cG15XVmsmD3EEZyvdYr4MbyGuADeukrfqWYdHFcdMNZaAwhIvbCf5ATZQ2CgprnYs2 iDe3jQHuJZSkW5J3Gm8zhil+Asz52utnbAxulVB1bV5+rl4MEtwuSUBbsRkn5y9cFiPH 0uF5DPbsTeZdO06Z6db4ZjvSUYw791hXRexp7YHbNDJp5P2oGPSLj88EwA9Br/fHabee JIYkYAK3FYlJJMIVptP3cLbbA7/Ro7vEMTt+cUemP20BX94Z7knwCgen3RZnRM1mkm0+ tyNgW7JSS1hT7UKXqu8vhfyhewOuQV6nRwkGLAyII+5aO8BJz0U4oF72/7DlLwOSBGNM jNUA== X-Gm-Message-State: AOJu0Yx33/OfhAkBa823nn5uIBY2lxicWmzLjmSdjoaphO1M642+TJsE OmbiHsPNO9U2A9uf/4/ZldufkHmB+pQg3ZvIbFtLGm+Xy3M4gaifTBipi3lttuUbliwy7gZcUf8 5JHDnafSNU/oSNN83EjIWMHnziX4= X-Gm-Gg: ASbGncucvMd33Zlh4w8FvZA5sM+ajAFKnCWtSYzTMSe0tkwYaPnQRhavOYEOaHO+qj5 JhdvdsuUIZSaa2QAXlXmYCuX3e+PgGZh1Eg== X-Google-Smtp-Source: AGHT+IHM3xCupKSNpsU97eGejor+gvRYoA+7759CAU4V5wGGy66fGoe93VftV4m4tnbS8J8KpFtOPP8eluBYLugZXMI= X-Received: by 2002:a17:90b:1c8a:b0:2ee:9229:e4bd with SMTP id 98e67ed59e1d1-2efd597df71mr6628577a91.2.1733856070933; Tue, 10 Dec 2024 10:41:10 -0800 (PST) MIME-Version: 1.0 References: <87ldwobycr.fsf@BULLSEYE-debian-live-builder> <87v7vrsb5u.fsf@HIDDEN> In-Reply-To: <87v7vrsb5u.fsf@HIDDEN> From: Ting Boon Ghee <tingbg@HIDDEN> Date: Wed, 11 Dec 2024 02:40:34 +0800 Message-ID: <CAE5kas+D-NafCA-zGcyj=GVQUuhWToQmQ2_mP-f8LA3-qsouCA@HIDDEN> Subject: Re: bug#74760: 29.4; Calc : calcFunc-rate does not produce negative results To: Michael Heerdegen <michael_heerdegen@HIDDEN> Content-Type: multipart/alternative; boundary="000000000000332b1b0628eed3af" X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 74760 Cc: 74760 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) --000000000000332b1b0628eed3af Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Thanks everyone for response. These financial functions (and more) are available in spreadsheets such as Libreoffice Calc. There is no restriction for Rate to be negative in Libreoffice Calc. One way to look at this is, from investment perspective, it just means the series of payments is less than the initial outlay, resulting in negative return. The Info manual describes the Rate function as an inverse of =E2=80=98pv=E2= =80=99: =E2=80=98rate(N, PAYMENT, AMOUNT)=E2=80=99 computes the value of RATE such = that =E2=80=98pv(RATE, N, PAYMENT) =3D AMOUNT=E2=80=99. So let's try PV. If Rate =3D -0.1, N =3D 1, PAYMENT =3D 90, calculate PV. Thus, M-x calc <RET> _0.1 <RET> 1 <RET> 90 <RET> b P Answer : 100 This means PV function can accept Rate as a negative number. I stumbled upon this issue because I was trying to recreate a table that I had done previously in Libreoffice Calc into an Org Table. The table uses Rate function to calculate a series of returns with a range of negative to positive returns. The negative returns generated errors in the table fields= . I suppose Emacs Calc was developed long ago to mimic handheld calculators. I'd wonder whether anyone is still using it as a "handheld" financial calculator. Such functions are most useful in spreadsheets. Emacs now has an implementation of a spreadsheet in the form of Org Table that uses Emacs Calc. This does mean that it is restricted to what Emacs Calc can provide. A missing function that I wish for is the XIRR function available in other spreadsheet softwares. --=20 Best regards, Boon Ghee --000000000000332b1b0628eed3af Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div>Thanks everyone for response.</div><div><br></div><di= v>These financial functions (and more) are available in spreadsheets such a= s Libreoffice Calc. There is no restriction for Rate to be negative in Libr= eoffice Calc. One way to look at this is, from investment perspective, it j= ust means the series of payments is less than the initial outlay, resulting= in negative return.</div><div><br></div><div>The Info manual describes the= Rate function as an inverse of =E2=80=98pv=E2=80=99: =E2=80=98rate(N,=C2= =A0PAYMENT, AMOUNT)=E2=80=99 computes the value of RATE such that =E2=80=98= pv(RATE, N,=C2=A0PAYMENT) =3D AMOUNT=E2=80=99. So let's try PV.</div><d= iv><br></div><div>If Rate =3D -0.1, N =3D 1, PAYMENT =3D 90, calculate PV. = Thus,</div><div><br></div><div>M-x calc <RET> _0.1 <RET> 1 <= RET> 90 <RET> b P</div><div>Answer : 100</div><div><br></div><div>= This means PV function can accept Rate as a negative number.</div><div><br>= </div><div><div>I stumbled upon this issue because I was trying to recreate= a table that I had done previously in Libreoffice Calc into an Org Table. = The table uses Rate function to calculate a series of returns with a range = of negative to positive=C2=A0returns. The negative returns generated errors= in the table fields.</div></div><div><br></div><div>I suppose Emacs Calc w= as developed long ago to mimic handheld calculators. I'd wonder whether= anyone is still using it as a "handheld" financial calculator. S= uch functions are most useful in spreadsheets. Emacs now has an implementat= ion of a spreadsheet in the form of Org Table that uses Emacs Calc. This do= es mean that it is restricted to what Emacs Calc can provide. A missing fun= ction that I wish for is the XIRR function available in other spreadsheet s= oftwares.</div><div dir=3D"ltr"><br></div><span class=3D"gmail_signature_pr= efix">-- </span><br><div dir=3D"ltr" class=3D"gmail_signature">Best regards= ,<br>Boon Ghee<br></div></div> --000000000000332b1b0628eed3af--
bug-gnu-emacs@HIDDEN:bug#74760; Package emacs.
Full text available.Received: (at 74760) by debbugs.gnu.org; 10 Dec 2024 17:24:24 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Dec 10 12:24:24 2024 Received: from localhost ([127.0.0.1]:59447 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1tL3yB-0000PD-TI for submit <at> debbugs.gnu.org; Tue, 10 Dec 2024 12:24:24 -0500 Received: from mout.web.de ([212.227.15.4]:42797) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <michael_heerdegen@HIDDEN>) id 1tL3y9-0000ON-LU for 74760 <at> debbugs.gnu.org; Tue, 10 Dec 2024 12:24:22 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=web.de; s=s29768273; t=1733851455; x=1734456255; i=michael_heerdegen@HIDDEN; bh=iSYSembDPyyW1nedyxCHIU/xFlQG1SYiFbrnnjKQ0dA=; h=X-UI-Sender-Class:From:To:Cc:Subject:In-Reply-To:References:Date: Message-ID:MIME-Version:Content-Type:cc:content-transfer-encoding: content-type:date:from:message-id:mime-version:reply-to:subject: to; b=id9ceINeojJSQcQz2SI3rrf2QvkPmW/HzNpyLik4IT7xr9GbpLOviP6JJcMXwI3M NkM7hMnkFvgUAMMR4JL8++FbCW2MMhXdBZ3/I80KVE1LWabSL9EwmXWHs4aq/7KUr qJrAUwTlQU+CPZa33fQORWOHtTadN94kxHRB6/140U5Bx96hfTaNga0UBG1Le0aXy aq+eb7aw9tMyuCJdwzf+NaarzSP1SUNH8BgALJRVLhGCi+iDPXqTxAjyZ+SZLywfh 9GFxCralKm0007huT/zk2mB9rjkW08d2Q+Ys2de7eAhIOl6R0jz6Hc0Qd27vn8I+J pKfUfN0hyCsmouIc1A== X-UI-Sender-Class: 814a7b36-bfc1-4dae-8640-3722d8ec6cd6 Received: from drachen.dragon ([92.75.138.197]) by smtp.web.de (mrweb005 [213.165.67.108]) with ESMTPSA (Nemesis) id 1M5j1q-1tEzQ504fS-004bo2; Tue, 10 Dec 2024 18:24:15 +0100 From: Michael Heerdegen <michael_heerdegen@HIDDEN> To: Ting Boon Ghee <tingbg@HIDDEN> Subject: Re: bug#74760: 29.4; Calc : calcFunc-rate does not produce negative results In-Reply-To: <87ldwobycr.fsf@BULLSEYE-debian-live-builder> (Ting Boon Ghee's message of "Tue, 10 Dec 2024 00:44:04 +0800") References: <87ldwobycr.fsf@BULLSEYE-debian-live-builder> Date: Tue, 10 Dec 2024 18:25:17 +0100 Message-ID: <87v7vrsb5u.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Provags-ID: V03:K1:8ThsAOWYOL7yUNl1/vqqr7thwUaQ7srWNsNM0z6bDnSI+6ExEvG YwqgizA0NW7mjk4zXK6daWoc94Ajn/x4jP/VvXlqO1LGg6dWdUdYAg4d57P99mWa1T5sDGe p4XNpYAdRBffD1Fdk3vUUT345wuV5IvlTj2WxZawJfn6xSOa5U8qxUMx+Lk5F8hnF6ZApOX q6ck6KBhR7+3OZnbaRoww== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:BrsJRP60Sh0=;yUCpPxq5BTqHqxPab/Nukmz8g+R FoWdU1E3QhtaNT0xFedXWjHJ+Ic6z7yow+VFyzbZ/vQaWKk160geVcDUwiQbQOryXcvYVtiJ9 YWZPNwp8NARN8sga017nQfQBKh4bHUdXEetMfcybl/QQ41JalMZu93C4Xibt8IpQlpP/28oqa Ij7gMQZOPY80r6gDQgnZx2mTbAq6vnAipN+d/9qNPDDGI5sk8cRszJg7saj9gW+Q3Iy8bkGj3 5fdNalBWDpFOyMaudgoNjGra21xV/Lh8tjwpnNrICUH5m6rE/lrf/KVufhmdd3AEdI+6EVpJj ZsRpZUFdJwIzaOR8uKmRtwAaWJ3rP4pmKGxWxW3XU2MOoFPCdnWITgqBnI6TfF5Y/Q1o7LvZH wblyHUDR64VnZ2RS4tcorEppgWm2yopx/lyiep0RDP6ShI02wk6SSws8y6jMxBSHXxHirPdS0 vnadkiND/m/QwMY74xxvqHV5/rZCVrFDwr/Z6wnP9QwNWTbe1dNcLodcRGbigHPgJt5/c5wdQ e376sQwv1JdfGOmH9jXKkyD5AcLZbvw1CS0vQohdaVs/0uMQG/UrdNuqZg+7VxRPO1k7w3t9i H7dkFj/Hpmw5PF/H/96v+MSMKEY7Sa4Oqvfzjbig3rJ59caHzDd1AdF4uZaTJemLOtXCRMWHF WbT+1RSQ0N5TR6cBz2CMCnCeod4B6yM8JTC8rpAZpXC5+ZYge4ZqxG/7Y0YKu6v5E0oUkdefB 1+LxpTvYzDHWVGJQN7TqgvZOMX4OhX3Jfz0j//hWkbKoopSFmp5rTaPMnk5JGNp4ARkOAew9X U6EUm0N3qy2xw4gsDT5+vdXSMGsyulQ1d/r+g5uD89d/5B/yaDrvutOfyYS+5ID9aX9Fl4R+j kSWEYVBu9x7RRWSELcoNfUAfVQF6qhtcW63sRT/+hod/q2zF6FZXVNG/NKNnLjLt5LXxLARXf fNvKjfn5cEjnAnb88CzH2FvQOE9LkTclPMq6esJ1DkqUWOWatB7SLqxCB9hYK+SIP4PQ60Y0q ZV8l+gziFfM0pPOUbT5vz9a+Q3xohijPIj9h8p2WaEw8i5ZRkcCW7wzR+3MSBrIyL1BF7Cv8d IFKAOsPk4= X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 74760 Cc: 74760 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.7 (-) Ting Boon Ghee <tingbg@HIDDEN> writes: > I am not sure if this is a bug or due to some restrictions or > constrains elsewhere that the interval cannot be negative in the > original function definition of math-compute-rate. It could be that the original authors just did not have this special case in mind when writing the code, and there is no such reason. Michael.
bug-gnu-emacs@HIDDEN:bug#74760; Package emacs.
Full text available.Received: (at 74760) by debbugs.gnu.org; 10 Dec 2024 16:14:51 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Dec 10 11:14:51 2024 Received: from localhost ([127.0.0.1]:59231 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1tL2ss-000228-P1 for submit <at> debbugs.gnu.org; Tue, 10 Dec 2024 11:14:51 -0500 Received: from ledu-giraud.fr ([51.159.28.247]:7946) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <manuel@HIDDEN>) id 1tL2sp-00021i-TU for 74760 <at> debbugs.gnu.org; Tue, 10 Dec 2024 11:14:48 -0500 DKIM-Signature: v=1; a=ed25519-sha256; c=simple/simple; s=ed25519; bh=9LSSqCrS 7ZWKg6LUowC08vIJyaiTA1ESl7q2UrNPV0o=; h=date:references:in-reply-to: subject:cc:to:from; d=ledu-giraud.fr; b=II3fS2VnMicE6ZmaHnVWf8CYEGozFV n7DUyqcdKLexmp+sCy1KjcNLZv/dg5q/I4+n9zizcSCxv91VqTKfzMBQ== DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; s=rsa; bh=9LSSqCrS7ZWKg6LU owC08vIJyaiTA1ESl7q2UrNPV0o=; h=date:references:in-reply-to:subject: cc:to:from; d=ledu-giraud.fr; b=K2q36yZ0lkG2NMw3PFgb0b1I5dy8DZzXQVGvMa w3xtKU36RhkS9kQNFZKNO2Ha6PNOFVOuCy0XwrSS2VOPCYwpGjDpRib3OgBZGe09ddcDN9 1YdqpwwYVbDEHKGMy7EmWpzQQeQQoVUwc3oB43OqXPeOfS6lLb9tI4Dz64ii4vrN8VaHmd pje9OF/KdrztNcz/PbcS96EHSEpR6SQw9MJHGqbcnZHb+3ykSoZnskHw99mpQciiMoyd+U q4QfI80CEgGcdwXCMc3aaNHcE0AK8lDvcX0k8654uhwXMKe/cZH3+mjg0ueRKs4ynI8Q2x YWTrpubiB2i7DNorhP/+PCaQ== Received: from computer (<unknown> [10.1.1.1]) by ledu-giraud.fr (OpenSMTPD) with ESMTPSA id 73815b61 (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Tue, 10 Dec 2024 17:14:46 +0100 (CET) From: Manuel Giraud <manuel@HIDDEN> To: Michael Heerdegen via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN> Subject: Re: bug#74760: 29.4; Calc : calcFunc-rate does not produce negative results In-Reply-To: <877c87tu0c.fsf@HIDDEN> (Michael Heerdegen via's message of "Tue, 10 Dec 2024 16:52:51 +0100") References: <87ldwobycr.fsf@BULLSEYE-debian-live-builder> <877c87tu0c.fsf@HIDDEN> Date: Tue, 10 Dec 2024 17:14:45 +0100 Message-ID: <87frmvo6q2.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 74760 Cc: Michael Heerdegen <michael_heerdegen@HIDDEN>, 74760 <at> debbugs.gnu.org, Ting Boon Ghee <tingbg@HIDDEN> X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) Michael Heerdegen via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN> writes: > Hello, > > could you please post a recipe? Hi, The recipe is at the end of the mail. -- Manuel Giraud
bug-gnu-emacs@HIDDEN:bug#74760; Package emacs.
Full text available.Received: (at submit) by debbugs.gnu.org; 10 Dec 2024 16:14:53 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Dec 10 11:14:53 2024 Received: from localhost ([127.0.0.1]:59234 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1tL2sv-00022a-9R for submit <at> debbugs.gnu.org; Tue, 10 Dec 2024 11:14:53 -0500 Received: from lists.gnu.org ([209.51.188.17]:57732) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <manuel@HIDDEN>) id 1tL2su-00022N-7K for submit <at> debbugs.gnu.org; Tue, 10 Dec 2024 11:14:52 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <manuel@HIDDEN>) id 1tL2st-0001xS-Sd for bug-gnu-emacs@HIDDEN; Tue, 10 Dec 2024 11:14:51 -0500 Received: from ledu-giraud.fr ([51.159.28.247]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <manuel@HIDDEN>) id 1tL2ss-0005p1-83 for bug-gnu-emacs@HIDDEN; Tue, 10 Dec 2024 11:14:51 -0500 DKIM-Signature: v=1; a=ed25519-sha256; c=simple/simple; s=ed25519; bh=9LSSqCrS 7ZWKg6LUowC08vIJyaiTA1ESl7q2UrNPV0o=; h=date:references:in-reply-to: subject:cc:to:from; d=ledu-giraud.fr; b=II3fS2VnMicE6ZmaHnVWf8CYEGozFV n7DUyqcdKLexmp+sCy1KjcNLZv/dg5q/I4+n9zizcSCxv91VqTKfzMBQ== DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; s=rsa; bh=9LSSqCrS7ZWKg6LU owC08vIJyaiTA1ESl7q2UrNPV0o=; h=date:references:in-reply-to:subject: cc:to:from; d=ledu-giraud.fr; b=K2q36yZ0lkG2NMw3PFgb0b1I5dy8DZzXQVGvMa w3xtKU36RhkS9kQNFZKNO2Ha6PNOFVOuCy0XwrSS2VOPCYwpGjDpRib3OgBZGe09ddcDN9 1YdqpwwYVbDEHKGMy7EmWpzQQeQQoVUwc3oB43OqXPeOfS6lLb9tI4Dz64ii4vrN8VaHmd pje9OF/KdrztNcz/PbcS96EHSEpR6SQw9MJHGqbcnZHb+3ykSoZnskHw99mpQciiMoyd+U q4QfI80CEgGcdwXCMc3aaNHcE0AK8lDvcX0k8654uhwXMKe/cZH3+mjg0ueRKs4ynI8Q2x YWTrpubiB2i7DNorhP/+PCaQ== Received: from computer (<unknown> [10.1.1.1]) by ledu-giraud.fr (OpenSMTPD) with ESMTPSA id 73815b61 (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Tue, 10 Dec 2024 17:14:46 +0100 (CET) From: Manuel Giraud <manuel@HIDDEN> To: Michael Heerdegen via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN> Subject: Re: bug#74760: 29.4; Calc : calcFunc-rate does not produce negative results In-Reply-To: <877c87tu0c.fsf@HIDDEN> (Michael Heerdegen via's message of "Tue, 10 Dec 2024 16:52:51 +0100") References: <87ldwobycr.fsf@BULLSEYE-debian-live-builder> <877c87tu0c.fsf@HIDDEN> Date: Tue, 10 Dec 2024 17:14:45 +0100 Message-ID: <87frmvo6q2.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain Received-SPF: pass client-ip=51.159.28.247; envelope-from=manuel@HIDDEN; helo=ledu-giraud.fr X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: -1.4 (-) X-Debbugs-Envelope-To: submit Cc: Michael Heerdegen <michael_heerdegen@HIDDEN>, 74760 <at> debbugs.gnu.org, Ting Boon Ghee <tingbg@HIDDEN> X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -2.4 (--) Michael Heerdegen via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN> writes: > Hello, > > could you please post a recipe? Hi, The recipe is at the end of the mail. -- Manuel Giraud
bug-gnu-emacs@HIDDEN:bug#74760; Package emacs.
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From: Michael Heerdegen <michael_heerdegen@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#74760: 29.4; Calc : calcFunc-rate does not produce negative
results
In-Reply-To: <86pllzbrkv.fsf@HIDDEN> (Eli Zaretskii's message of "Tue, 10 Dec
2024 15:22:40 +0200")
References: <87ldwobycr.fsf@BULLSEYE-debian-live-builder>
<86pllzbrkv.fsf@HIDDEN>
Date: Tue, 10 Dec 2024 17:00:08 +0100
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Eli Zaretskii <eliz@HIDDEN> writes:
> Isn't it true that in the financial world there are no negative rates,
> only positive rates written in red color? Maybe this explains what
> you see?
It's probably not related but: this part of `calc-fin-rate' is clearly
suspicious:
(calc-to-percentage
(calc-normalize
(cons (if (calc-is-hyperbolic) 'calcFunc-ratel
(if (calc-is-hyperbolic) 'calcFunc-rateb ;; !@?!
'calcFunc-rate))
(calc-top-list-n n))))
Looks like one of those two identical `calc-is-hyperbolic' tests
must be replaced with `calc-is-inverse' (the second one?).
Michael.
bug-gnu-emacs@HIDDEN:bug#74760; Package emacs.
Full text available.Received: (at 74760) by debbugs.gnu.org; 10 Dec 2024 15:51:59 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Dec 10 10:51:59 2024 Received: from localhost ([127.0.0.1]:59168 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1tL2Wl-00008W-5U for submit <at> debbugs.gnu.org; Tue, 10 Dec 2024 10:51:59 -0500 Received: from mout.web.de ([212.227.17.12]:56797) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <michael_heerdegen@HIDDEN>) id 1tL2Wi-000080-Sa for 74760 <at> debbugs.gnu.org; Tue, 10 Dec 2024 10:51:57 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=web.de; s=s29768273; t=1733845909; x=1734450709; i=michael_heerdegen@HIDDEN; bh=pf2uLWI/8FQLbPEzBeBwc58AqgfdNyjgBIKw+BcbpmQ=; h=X-UI-Sender-Class:From:To:Cc:Subject:In-Reply-To:References:Date: Message-ID:MIME-Version:Content-Type:cc:content-transfer-encoding: content-type:date:from:message-id:mime-version:reply-to:subject: to; b=nxfWhlcxKd3f09NlxcLPb8yOWzaOzc9MV51DvDBBwnNH/tjJL9CqbZtSJYcs/ISD NALF1KGPfmS4KwiwGRZUsQQLIcXNLDsh33K6vI55gSk095bsjXRqJyR+Xc5w7izta x6FSozkLsUQ9HMGGNBwaUpMmCQ0uOBTeZPr+ve3qeb/N+UMqTz7LwhJ27wIZem33H YalXEp19yr59GCFy00oL4mqcdK5CQyGTNzHAiayt6NVKyVeFpgcwOko/jX/w350Gp QlyaOnDLi4bOU4++hsuD/ND+A42VihqLlIuFzbF/MhqZddHixZPaHRCUGC3d0CcWJ 2nxqEwgEI5Sie/FmCw== X-UI-Sender-Class: 814a7b36-bfc1-4dae-8640-3722d8ec6cd6 Received: from drachen.dragon ([92.75.138.197]) by smtp.web.de (mrweb106 [213.165.67.124]) with ESMTPSA (Nemesis) id 1MhFlo-1tqXWJ3N9W-00bfoY; Tue, 10 Dec 2024 16:51:49 +0100 From: Michael Heerdegen <michael_heerdegen@HIDDEN> To: Ting Boon Ghee <tingbg@HIDDEN> Subject: Re: bug#74760: 29.4; Calc : calcFunc-rate does not produce negative results In-Reply-To: <87ldwobycr.fsf@BULLSEYE-debian-live-builder> (Ting Boon Ghee's message of "Tue, 10 Dec 2024 00:44:04 +0800") References: <87ldwobycr.fsf@BULLSEYE-debian-live-builder> Date: Tue, 10 Dec 2024 16:52:51 +0100 Message-ID: <877c87tu0c.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Provags-ID: V03:K1:OEvi+6Gd64r63q2uihpHJeosnfwRWzzeFtzsPFEfs9RE9gFHZZs IqiTe/0YnurMHiPE2JIbSj9nvhb95WZwVOFq0qSfefrlx7XkQHMylq0OfYwLeSH5YdA10Oq /G2+cCdd6GcukQyoOxqcVD1wgVfEpsnzPP5tFDBoyz4YKlO9D6AqB+8s1xmLtHCGNJeS8oT SkJFu5+Z/4mIEPvOPhQnQ== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:EeEdD9zMokE=;29F1ONf1VfBvpqmeHtLZpO08SsK k1EJO68iYoEKRyIwGavpubX2XEZzzfwjyKXjzFhQpQassksMR29Iobea4ruNDIb6PmCZX4F29 MDQ4+n7SiG+FsO51NmnZEDLwvMU05vlh5JaNokwimkux1orEDHC5dAxbpS6NSTC8CXRIrvTJN Fw6R2mXp35Ug2EjWEZSKheZThxs754CHoGPWPKUNWMDvqhdiXPu+3glEUPW/gODFI1oDPm9rF TTYVic5wah5UtfIl2HBOKctNIWKq+tBabnc1hqPBvJBdAAx6hMxBjb7i0oCD+rugDHd+0LZzC NdGjuu7/xHEGXCBj3pWC6uqzhlzQAU8iFKy5/IPh+LRDIrau+U47Io/edzEsECStdnO1ErYU2 kWYxBu+usXNl1D/3rjp8ZVec+tMQwoUA3AG1QAMWHALPGKloEcIEVaPXvdbPWBaUhrBlingLN EKefGvU1ZmRsgpcoDYJnLr4dqDvrsYw5wqhPihsIOHhiX+y9bpQd5skZ1B1F2Sh1sZSFEiTTg IXBLtGrr2fFtCwPCQx3oTMA22hbCYAEudoFlRCpReETaB3Exx2eC0SsZLTGvCyGcoPANohu49 NNLTjYBA3x6X5je/5BmZmL9SFyG16t7Dtwn+UrRtoo8l1ILQNE2/DVcOGNxlkavxzmK2XojnM QPnZ9Va+OuW4FWztJOSkumij0e4awbwRO40sL62xdLORqwPZ0IPRz0LNcXTcK9SCG6F2W5+8q Q/X2d8W1Ohu7nOpbt++TJn/G1fLWLa76jYTR75M6hoK/8uSfFsUWYqG/rgJ9odurViOhCXVwE mpB8l9FumnPzUgktoknunFpt8znT9hO0+ECKaMwTZ5Km0J07m+4swSnjM57wajWxv9LbbVcis uThkWQVMPyYamw/5GJFAM1Y8xZ9ExaVnTJb2g8xIBeMOaViKHXjeyARqky69OSAgh1M4ziafZ XWbY7Sb/M6OMEordZYc3p1Gxl8fHzresvCqD7gybyUFr6c/fItOHSKmuoGMDhsiXL5WJRBZ9c /t+dZOD6/w+WBulrcTSQ0upJp5e+arIqnEa9M+k8yMYpa3BwfIoS5WXox7JR7TBBk9xBtA9b2 1Ftk1T0Lo= X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 74760 Cc: 74760 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) Hello, could you please post a recipe? TIA, Michael.
bug-gnu-emacs@HIDDEN:bug#74760; Package emacs.
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Central banks, for example, have set their very short-term rates negative to deter savings (depositor pays bank to save rather than the bank paying the depositor) and encourage credit growth and reduce longer-term rates (lending or investing in longer-term instruments). Of course, you won't get a negative-rate mortgage, this scheme is focused on money-center banks, not retail consumers. In other places like the commodity markets, you can also see negatives for things you might not expect. Oil prices were driven negative for a short time when there was no excess shipping capacity and the cost of shipping hyperinflated. On Tue, Dec 10, 2024 at 8:23=E2=80=AFAM Eli Zaretskii <eliz@HIDDEN> wrote: > > Date: Tue, 10 Dec 2024 00:44:04 +0800 > > From: Ting Boon Ghee <tingbg@HIDDEN> > > > > Using Calc to compute the rate of return on an investment, negative > returns will result in error. > > Isn't it true that in the financial world there are no negative rates, > only positive rates written in red color? Maybe this explains what > you see? > > > > --0000000000002372fa0628eaafe0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:monospac= e">Negative rates do indeed exist in the real world. Central banks, for exa= mple, have set their very short-term rates negative to deter=C2=A0savings (= depositor pays bank to save rather than the bank paying the depositor) and = encourage credit growth and reduce longer-term rates (lending or investing = in longer-term instruments). Of course, you won't get a negative-rate m= ortgage, this scheme is focused on money-center banks,=C2=A0not retail cons= umers. In other places like the commodity markets, you can also see negativ= es for things you might not expect. Oil prices were driven negative for a s= hort time when there was no excess shipping capacity and the cost of shippi= ng hyperinflated.</div></div><br><div class=3D"gmail_quote gmail_quote_cont= ainer"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Dec 10, 2024 at 8:23= =E2=80=AFAM Eli Zaretskii <<a href=3D"mailto:eliz@HIDDEN">eliz@HIDDEN<= /a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0= px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">&= gt; Date: Tue, 10 Dec 2024 00:44:04 +0800<br> > From: Ting Boon Ghee <<a href=3D"mailto:tingbg@HIDDEN" target=3D= "_blank">tingbg@HIDDEN</a>><br> > <br> > Using Calc to compute the rate of return on an investment, negative re= turns will result in error.<br> <br> Isn't it true that in the financial world there are no negative rates,<= br> only positive rates written in red color?=C2=A0 Maybe this explains what<br= > you see?<br> <br> <br> <br> </blockquote></div> --0000000000002372fa0628eaafe0--
bug-gnu-emacs@HIDDEN:bug#74760; Package emacs.
Full text available.Received: (at 74760) by debbugs.gnu.org; 10 Dec 2024 13:22:54 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Dec 10 08:22:54 2024 Received: from localhost ([127.0.0.1]:57343 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1tL0CT-0005TF-2j for submit <at> debbugs.gnu.org; Tue, 10 Dec 2024 08:22:53 -0500 Received: from eggs.gnu.org ([209.51.188.92]:55402) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1tL0CR-0005SH-3F for 74760 <at> debbugs.gnu.org; Tue, 10 Dec 2024 08:22:51 -0500 Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <eliz@HIDDEN>) id 1tL0CL-0001gI-G3; Tue, 10 Dec 2024 08:22:45 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=References:Subject:In-Reply-To:To:From:Date: mime-version; bh=Z+iboHS3OiKZXADvy8o/RXG179m+9zXtad6cERQ2rTE=; b=Gj/7NGeNu8Sz VDTp8bBKWgpVAJsKeYhmgQs71Bd0qzpRYz2zRf7kDPOKfsc6uP2cyUueFaJOjs6GCq8B26/eel9lv M+UWVt15UelmG/FRqU5JDkS6FnDBiQo877FgrzHPIqDVk9rPx4oIMwDB6h9ZhPpo2pPwcTIjijAen 4z9AmRbWDo496HLyTPhDafEWD/agzBQ171mOfCwcuOw4GHpl+DuBAtdsNB1nQUztIw1J+WY6tQ4Pg 13TSk/t4s7CFiphycShnHAm53ntL/xevBascdFYLqWgJfa1loQ6tWvVCbBPqmFl85KnQOQoqd1UvO iGHP4by6+k9y7qxx9UM0tA==; Date: Tue, 10 Dec 2024 15:22:40 +0200 Message-Id: <86pllzbrkv.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: Ting Boon Ghee <tingbg@HIDDEN> In-Reply-To: <87ldwobycr.fsf@BULLSEYE-debian-live-builder> (message from Ting Boon Ghee on Tue, 10 Dec 2024 00:44:04 +0800) Subject: Re: bug#74760: 29.4; Calc : calcFunc-rate does not produce negative results References: <87ldwobycr.fsf@BULLSEYE-debian-live-builder> X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 74760 Cc: 74760 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) > Date: Tue, 10 Dec 2024 00:44:04 +0800 > From: Ting Boon Ghee <tingbg@HIDDEN> > > Using Calc to compute the rate of return on an investment, negative returns will result in error. Isn't it true that in the financial world there are no negative rates, only positive rates written in red color? Maybe this explains what you see?
bug-gnu-emacs@HIDDEN:bug#74760; Package emacs.
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From: Ting Boon Ghee <tingbg@HIDDEN>
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Subject: 29.4; Calc : calcFunc-rate does not produce negative results
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Using Calc to compute the rate of return on an investment, negative returns will result in error.
;; Extract from manual on the description of this function
8.6.4 Related Financial Functions
---------------------------------
The ‘b T’ (‘calc-fin-rate’) [‘rate’] command computes the rate of return on an investment. This is also an inverse of ‘pv’: ‘rate(N, PAYMENT, AMOUNT)’ computes the value of RATE such that ‘pv(RATE, N, PAYMENT) = AMOUNT’. The result is expressed as a formula like ‘6.3%’.
;; Example of positive return working correctly
;; Calculations for N=1, Payment=110 Amount=100
;; Answer is 10% as expected
;; Using the calculator
M-x calc <RET> 1 <RET> 110 <RET> 100 <RET> b T
Answer is 10%
;; Evaluating the original function from calc-fin.el
(calcFunc-rate 1 110 100)
Answer : (float 1 -1)
;; Negative returns result in error
;; Calculations for N=1, Payment=90 Amount=100
;; Answer should be -10%
;; Using the calculator
M-x calc <RET> 1 <RET> 90 <RET> 100 <RET> b T
Result : rate(1, 90, 100)
Pressing '=' in the calculator subsequently gives the following message
Working... widen = (-1.59974 .. 199261559.20347)
Unable to bracket root: (-1.599740 .. 199261559.203470)
;; Evaluating the original function from calc-fin.el
(calcFunc-rate 1 90 100)
Evaluating the function produces this Backtrace message
Debugger entered--Lisp error: (wrong-type-argument "*Unable to bracket root" (intv 0 (float -159974 -5) (float 19926155920347 -5)))
math-reject-arg((intv 0 (float -159974 -5) (float 19926155920347 -5)) "*Unable to bracket root")
math-search-root((- (calcFunc-pv (var DUMMY var-DUMMY) 1 90 0) 100) (+ (/ 90 (* (var DUMMY var-DUMMY) (^ (+ (var DUMMY var-DUMMY) 1) 2))) (/ (- (/ 90 (+ (var DUMMY var-DUMMY) 1)) 90) (^ (var DUMMY var-DUMMY) 2))) (float 1 -4) (float -1000899910009 -11) (float 1 0) (float -55 0))
math-newton-search-root((- (calcFunc-pv (var DUMMY var-DUMMY) 1 90 0) 100) (+ (/ 90 (* (var DUMMY var-DUMMY) (^ (+ (var DUMMY var-DUMMY) 1) 2))) (/ (- (/ 90 (+ (var DUMMY var-DUMMY) 1)) 90) (^ (var DUMMY var-DUMMY) 2))) nil nil nil nil (float 1 -4) (float -1000899910009 -11) (float 1 0) (float -55 0))
math-find-root((calcFunc-eq (calcFunc-pv (var DUMMY var-DUMMY) 1 90 0) 100) (var DUMMY var-DUMMY) (intv 3 (float 1 -4) 1) t)
math-compute-rate(1 90 100 nil calcFunc-pv)
calcFunc-rate(1 90 100)
elisp--eval-last-sexp(nil)
eval-last-sexp(nil)
funcall-interactively(eval-last-sexp nil)
command-execute(eval-last-sexp)
;; Original definition of calcFunc-rate and math-compute-rate copied from calc-fin.el as follows
(defun calcFunc-rate (num pmt amount &optional lump)
(math-compute-rate num pmt amount lump 'calcFunc-pv))
(defun math-compute-rate (num pmt amount lump func)
(or (math-objectp num)
(math-reject-arg num 'numberp))
(or (math-objectp pmt)
(math-reject-arg pmt 'numberp))
(or (math-objectp amount)
(math-reject-arg amount 'numberp))
(or (null lump)
(math-objectp lump)
(math-reject-arg lump 'numberp))
(let ((root (math-find-root (list 'calcFunc-eq
(list func
'(var DUMMY var-DUMMY)
num
pmt
(or lump 0))
amount)
'(var DUMMY var-DUMMY)
'(intv 3 (float 1 -4) 1)
t)))
(if (math-vectorp root)
(nth 1 root)
root)))
;; My modified function definitions
(defmath my/rate (num pmt amount &optional lump)
(my/compute-rate num pmt amount lump 'calcFunc-pv))
(defmath my/compute-rate (num pmt amount lump func)
(or (math-objectp num)
(math-reject-arg num 'numberp))
(or (math-objectp pmt)
(math-reject-arg pmt 'numberp))
(or (math-objectp amount)
(math-reject-arg amount 'numberp))
(or (null lump)
(math-objectp lump)
(math-reject-arg lump 'numberp))
(let ((root (math-find-root (list 'calcFunc-eq
(list func
'(var DUMMY var-DUMMY)
num
pmt
(or lump 0))
amount)
'(var DUMMY var-DUMMY)
'(intv 3 -1 1)
t)))
(if (math-vectorp root)
(nth 1 root)
root)))
By changing the interval from '(intv 3 (float 1 -4) 1) to '(intv 3 -1 1), the correct answer of -10% for above example can be computed.
;; Evaluating my modified function
(calcFunc-my/rate 1 90 100)
Answer : (float -1 -1)
That is -10% as expected.
I am not sure if this is a bug or due to some restrictions or constrains elsewhere that the interval cannot be negative in the original function definition of math-compute-rate. Other than Rate, IRR function is also facing the same issue as the interval for math-compute-irr is also set as '(intv 3 (float 1 -4) 1).
Calculations can also be crosschecked with spreadsheets. Results should be same.
--
Best regards,
Boon Ghee
Ting Boon Ghee <tingbg@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.bug-gnu-emacs@HIDDEN:bug#74760; Package emacs.
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