Dear group,
A substitution like this is easy to make with SymPy:
(a*x**2+b*x+c).subs(x,y)
However, how can I make a conditional substitution, such as:
a) One that would replace even powers of x only.
b) One which would replace even powers of x by y**(n/2) resulting in
a*y**7+b*x+c? I.e. one where parts of the object being replaced would be
available to form part of the result - thus x**14 would contribute '7'
to the resultant expression.
Thanks in anticipation!
David
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