how to use certain maxima functions (e.g. ratsubst)?

matthjes
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I cannot figure out how to use maxima functions like ratsubst within sage.

For example: X = maxima('x^2') Now I'd like to substitute x with k. In Maxima, this is done via: X: x^2; ratsubst(k, x, X);

How do I call ratsubst from Sage? If I use X.ratsubst('k', 'x') then it simply prints out 'x'...

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achrzesz
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sage: maxima('X:x^2')            
x^2
sage: maxima('ratsubst(k,x,X)')
k^2
sage: maxima('X,x=k')            
k^2

sage: X=x^2 sage: var('k') k sage: X(x=k) k^2

achrzesz ( 2012-03-12 11:43:33 +0100 )edit

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Asked: 2012-03-12 09:24:47 +0100

Seen: 724 times

Last updated: Mar 12 '12