[Maxima-bugs] [maxima:bugs] Re: #4641 is does not work

[dan h. <zm...@us...>]

 The reason i think it should work because(t:matrix([1],[2]),t,t[2],.1/( t[2]-1));does come back with the correct answer using it as i should think without any t[2][1] or first(t[2]) etc.so it should do so in(t:matrix([1],[2]),t,t[2],is( t[2]=2));rather than giving false should be true and (t:matrix([1],[2]),is(abs(t[2])>0));should come back true rather than unknown. To be consistent if it workedcorrectly in the numeric case it should do the same in these other cases. It is not consistent if it didn't.I would have written this in the forum but i could not find it in bugs. I could not even get a list of bugs so i wrote it here.

    On Monday, December 1, 2025 at 10:10:50 AM CST, Raymond Toy <rt...@us...> wrote:  
 
 
With your example t[2] is [2], a 1x1 matrix. (Well, a list of one element). I think unknown is a good answer. Perhaps you really wanted is(t[2][1]>0). This returns true.

[bugs:#4641] is does not work

Status: open
Group: None
Created: Mon Dec 01, 2025 04:03 PM UTC by dan hayes
Last Updated: Mon Dec 01, 2025 04:03 PM UTC
Owner: nobody

build_info() or bug_report()
"branch_5_44_base_231_g5c411f69f",timestamp="2021-01-12 23:51:42",host="x86_64-w64-mingw32",lisp_name="SBCL",lisp_version="2.0.0",maxima_userdir="C:/Users/zmth1/maxima",maxima_tempdir="C:/Users/zmth1/AppData/Local/Temp",maxima_objdir="C:/Users/zmth1/maxima/binary/branch_5_44_base_231_g5c411f69f/sbcl/2_0_0",maxima_frontend="wxMaxima",maxima_frontend_version="20.12.2-DevelopmentSnapshot_MSW_OpenMP201511+Locks")

(t:matrix([1],[2]),t,t[2],is( t[2]>0)); 

and it comes back with unknown

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**[bugs:#4641] is does not work**

**Status:** not-a-bug
**Group:** None
**Created:** Mon Dec 01, 2025 04:03 PM UTC by dan hayes
**Last Updated:** Wed Dec 03, 2025 03:37 PM UTC
**Owner:** nobody


build_info()  or bug_report()
"branch_5_44_base_231_g5c411f69f",timestamp="2021-01-12 23:51:42",host="x86_64-w64-mingw32",lisp_name="SBCL",lisp_version="2.0.0",maxima_userdir="C:/Users/zmth1/maxima",maxima_tempdir="C:/Users/zmth1/AppData/Local/Temp",maxima_objdir="C:/Users/zmth1/maxima/binary/branch_5_44_base_231_g5c411f69f/sbcl/2_0_0",maxima_frontend="wxMaxima",maxima_frontend_version="20.12.2-DevelopmentSnapshot_MSW_OpenMP201511+Locks")

(t:matrix([1],[2]),t,t[2],is( t[2]>0));   

and it comes back with unknown



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