[Maxima-bugs] [maxima:bugs] #4490 error message when adding non-conformable matrices

[Robert D. <rob...@us...>]

- **labels**:  --> matrix, list, arithmetic
- **status**: open --> closed
- **Comment**:

I've pushed commit [ fa4dcfa1d ] to give a more meaningful error message. Examples:
```
(%i2) matrix ([a, b], [c, d]) + [x, y, z]; 
addition: non-conformable list or matrix arguments.
 -- an error. To debug this try: debugmode(true);

(%i3) matrix ([a, b], [c, d]) + matrix ([x, y, z], [z, y, x]);
addition: non-conformable list or matrix arguments.
 -- an error. To debug this try: debugmode(true);

(%i4) [a, b, c, d] + [x, y, z];
addition: non-conformable list or matrix arguments.
 -- an error. To debug this try: debugmode(true);
```
Closing this ticket as fixed.



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**[bugs:#4490] error message when adding non-conformable matrices**

**Status:** closed
**Group:** None
**Labels:** matrix list arithmetic 
**Created:** Thu Feb 13, 2025 02:52 PM UTC by Barton Willis
**Last Updated:** Thu Feb 13, 2025 02:52 PM UTC
**Owner:** nobody


For addition of non-conformable matrices, the error message should be something like "Attempt to sum non-conformable matrices", not an error message about the arguments to  `fullmap.` 

~~~
(%i3) matrix([1,2],[3,4]) + matrix([a,b]);
fullmap: arguments must have same formal structure.
 -- an error. To debug this try: debugmode(true);
~~~


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