[Maxima-bugs] [ maxima-Bugs-1734231 ] even / odd functions with matrix args

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Bugs item #1734231, was opened at 2007-06-09 17:34
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Category: Lisp Core
Group: None
Status: Open
Resolution: None
Priority: 2
Private: No
Submitted By: Barton Willis (willisbl)
Assigned to: Barton Willis (willisbl)
Summary: even / odd functions with matrix args

Initial Comment:
For a declared even function, I think Maxima uses
mminusp to decide when to apply the even function
rule. This scheme sometimes fails:

(%i8) declare(f,evenfun)$
(%i9) f(matrix([-a])) - f(matrix([a]));
(%o9) f(matrix([-a]))-f(matrix([a])) <-- should be 0.

The trig functions use a different scheme. This method works for matrix arguments

(%i10) cos(matrix([-a]));
(%o10) cos(matrix([a]))

I think Maxima should uniformly use the even / odd
function rule code that is in trigi.lisp.



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