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Why can 'matrix' not use cached functions?

asked 2015-06-15 15:09:01 -0500

Peter Luschny gravatar image

Consider

def L(n,k):
    if n==k: return 1
    if k<0 or k>n: return 0
    return L(n-1,k-1)+(n+k-1)*L(n-1,k)

print parent(L)
matrix(ZZ, 8, L)

This works. However, as soon as I decorate the above function L with the very reasonable "@CachedFunction" I receive an ValueError: "Invalid matrix constructor".

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answered 2015-06-16 02:38:51 -0500

updated 2015-06-16 09:47:14 -0500

(after change of CachedFunction to cached_function there is a ValueError)

It's a bug. When I add sage.misc.cachefunc.CachedFunction to this line in matrix/constructor.py it works fine:

if isinstance(args[0], (types.FunctionType, types.LambdaType, types.MethodType)):

I have submitted the fix for review: http://trac.sagemath.org/ticket/18713

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Of course it's a bug. It does not make any sense. Thanks!

Peter Luschny gravatar imagePeter Luschny ( 2015-06-16 03:29:24 -0500 )edit

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Asked: 2015-06-15 15:09:01 -0500

Seen: 95 times

Last updated: Jun 16 '15