Unevaluation of known functions

[rtoy]

Imported from SourceForge on 2024-07-04 23:18:22 Created by caprilo on 2019-09-27 19:56:19 Original: https://sourceforge.net/p/maxima/bugs/3584

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Some expressions do not get wholy evaluated. For instance, take

f(x):= sqrt(1-(cos(x) + sin(x)-1)^2);

when typing f(0), the answer is sqrt(1- sin(0)^2), and I expected it to be 1.

wxMaxima version: 19.01.2x using wxWidgets version: wxWidgets 3.0.4 Maxima version: 5.42.1 Maxima build date: 2018-11-02 17:35:03 Host type: x86_64-pc-linux-gnu System type: BSD BSD NIL Lisp implementation type: GNU Common Lisp (GCL) Lisp implementation version: GCL 2.6.12 wxMaxima's idea of the directory layout is: User configuration dir: /home/carlos/.maxima/ Help dir: /usr/share/doc/wxmaxima Maxima lisp dir: /usr/share/maxima//5.42.1

[rtoy]

Imported from SourceForge on 2024-07-04 23:18:23 Created by willisbl on 2019-09-28 12:10:22 Original: https://sourceforge.net/p/maxima/bugs/3584/#2d12

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I'm unable to duplicate this using SBCL. Did you have a non-default value for some option variable? Try restarting Maxmia and try again. This is what I get:

(%i1)   f(x):= sqrt(1-(cos(x) + sin(x)-1)^2)$
(%i2)   f(0);
(%o2)   1
(%i3)   build_info();
(%o3)   build_info(version="5.42.2",timestamp="2019-01-25 00:03:21",host="x86_64-w64-mingw32",lisp_name="SBCL",lisp_version="1.4.2")

[rtoy]

Imported from SourceForge on 2024-07-04 23:18:27 Created by caprilo on 2019-09-29 05:36:33 Original: https://sourceforge.net/p/maxima/bugs/3584/#2d12/d407

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I cannot replicate it now that I'm trying!

I've got this error many times recently with different notebooks and functions, but, now that I try to reproduce it, I can't :/

I'll try to look for the cause if it happens again. Thanks.

On 28/09/19 5:10, Barton Willis wrote:

I'm unable to duplicate this using SBCL. Did you have a non-default value for some option variable? Try restarting Maxmia and try again. This is what I get:

(%i1) f(x):= sqrt(1-(cos(x) + sin(x)-1)^2)$ (%i2) f(0); (%o2) 1 (%i3) build_info(); (%o3) build_info(version="5.42.2",timestamp="2019-01-25 00:03:21",host="x86_64-w64-mingw32",lisp_name="SBCL",lisp_version="1.4.2")

[bugs:#3584] https://sourceforge.net/p/maxima/bugs/3584/ Unevaluation of known functions

Status: open Group: None Labels: evaluation Created: Fri Sep 27, 2019 07:56 PM UTC by caprilo Last Updated: Fri Sep 27, 2019 07:56 PM UTC Owner: nobody

Some expressions do not get wholy evaluated. For instance, take

|f(x):= sqrt(1-(cos(x) + sin(x)-1)^2);|

when typing |f(0)|, the answer is |sqrt(1- sin(0)^2)|, and I expected it to be |1|.

wxMaxima version: 19.01.2x using wxWidgets version: wxWidgets 3.0.4 Maxima version: 5.42.1 Maxima build date: 2018-11-02 17:35:03 Host type: x86_64-pc-linux-gnu System type: BSD BSD NIL Lisp implementation type: GNU Common Lisp (GCL) Lisp implementation version: GCL 2.6.12 wxMaxima's idea of the directory layout is: User configuration dir: /home/carlos/.maxima/ Help dir: /usr/share/doc/wxmaxima Maxima lisp dir: /usr/share/maxima//5.42.1

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Attachments:

• https://sourceforge.net/p/maxima/bugs/_discuss/thread/8308ea3450/2d12/d407/attachment/alternate

[rtoy]

Imported from SourceForge on 2024-07-04 23:18:31 Created by willisbl on 2019-09-29 09:31:02 Original: https://sourceforge.net/p/maxima/bugs/3584/#4b37

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• status: open --> closed

[rtoy]

Imported from SourceForge on 2024-07-04 23:18:34 Created by willisbl on 2019-09-29 09:31:02 Original: https://sourceforge.net/p/maxima/bugs/3584/#112a

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I'm going to close this bug report. If it happens again, please re-open the ticket.

[rtoy]

Imported from SourceForge on 2024-07-04 23:18:38 Created by willisbl on 2019-09-29 09:31:15 Original: https://sourceforge.net/p/maxima/bugs/3584/#9d32

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I'm going to close this bug report.