#15487: better error message when doing symbolic things with matrices
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Reporter: kcrisman | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Changes (by kcrisman):
* component: linear algebra => symbolics
Old description:
> [https://groups.google.com/forum/#!msg/sage-
> support/lpqzCOja6kg/lWVdmInFa8gJ This sage-support post] points out that
> our error message isn't very helpful when trying to use matrices in
> symbolic expressions.
> {{{
> sage: P=x^2
> sage: P(x=4)
> 16
> sage: M=matrix([(1, -3, -1),(0, 1, 1),(-1, 2, 1)])
> sage: P(x=M)
> <boom that doesn't tell you do use polynomial rings>
> }}}
> Let's improve this. If we can even get this to work properly (no boom)
> that would be even better.
New description:
[https://groups.google.com/forum/#!msg/sage-
support/lpqzCOja6kg/lWVdmInFa8gJ This sage-support post] points out that
our error message isn't very helpful when trying to use matrices in
symbolic expressions.
{{{
sage: P=x^2
sage: P(x=4)
16
sage: M=matrix([(1, -3, -1),(0, 1, 1),(-1, 2, 1)])
sage: P(x=M)
<boom that doesn't tell you do use polynomial rings>
}}}
Let's improve this. If we can even get this to work properly (no boom)
that would be even better.
See also [https://groups.google.com/forum/#!topic/sage-edu/0hPo7pl-G5I
this sage-edu thread] and [http://stackoverflow.com/questions/37303271
/how-to-define-the-variable-as-a-matrix-in-sage/ this SO.com question].
There's really no reason not to fix this if we can. It seems to really be
a coercion question.
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Ticket URL: <http://trac.sagemath.org/ticket/15487#comment:4>
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