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

[Raymond T. <rt...@us...>]

I think that's caused by two things.  `t[2]` is a list, not matrix.  And `listarith` idefaults to `true`, so list arithmetic is done.  If you set `listarith` to `false`,  then I get:
```
(%i17) listarith:false;
(%o17)                               false
(%i18) .1/(t[2]-1);
                                      0.1
(%o18)                              ───────
                                    [2] - 1
```
I do not know why `t[2]` doesn't return a matrix.


---

**[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



---

Sent from sourceforge.net because max...@li... is subscribed to https://sourceforge.net/p/maxima/bugs/

To unsubscribe from further messages, a project admin can change settings at https://sourceforge.net/p/maxima/admin/bugs/options.  Or, if this is a mailing list, you can unsubscribe from the mailing list.