[Maxima-bugs] [maxima:bugs] #4815 Matrix ordered incorrectly in sums and products

[David S. <tom...@us...>]

- **labels**: simplus, matrix --> simplus, matrix, simptimes
- **summary**: Matrix ordered incorrectly in sum --> Matrix ordered incorrectly in sums and products
- Description has changed:

Diff:

~~~~

--- old
+++ new
@@ -9,3 +9,13 @@
 ~~~
 
 The correct output for `(%o3)` is `v + matrix([2])`.
+
+The exact same bug exists for products:
+
+~~~
+(%i4) expr : v * matrix([1]);
+(%o4) v * matrix([1])
+
+(%i5) expr * matrix([1]);
+(%o5) v * matrix([1]) * matrix([1])
+~~~

~~~~




---

**[bugs:#4815] Matrix ordered incorrectly in sums and products**

**Status:** open
**Group:** None
**Labels:** simplus matrix simptimes 
**Created:** Sun Jul 12, 2026 01:00 PM UTC by David Scherfgen
**Last Updated:** Sun Jul 12, 2026 01:00 PM UTC
**Owner:** nobody


~~~
(%i1) declare(v, nonscalar)$

(%i2) expr : v + matrix([1]);
(%o2) v + matrix([1])

(%i3) expr + matrix([1]);
(%o3) v + matrix([1]) + matrix([1])
~~~

The correct output for `(%o3)` is `v + matrix([2])`.

The exact same bug exists for products:

~~~
(%i4) expr : v * matrix([1]);
(%o4) v * matrix([1])

(%i5) expr * matrix([1]);
(%o5) v * matrix([1]) * matrix([1])
~~~


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