I am not good in patterns in Mathematica, and so can’t figure what I am doing wrong.
This example works, when the exponent is 1
ClearAll[y,x,n] Cases[{( y[x]/x)^1}, (y[x]/x )^(n_.) :> n]
But when exponent is 2
it does not find it
Cases[{( y[x]/x)^2}, (y[x]/x )^(n_.) :> n]
Help says
I think this happens, because the font end changes (y[x]/x)^2
to y[x]^2/x^2
before Cases
gets hold of it? So the pattern is lost. But when I tried
Cases[{( y[x]/x)^2}, (y[x]^n_.)/(x^n_.):>n]
It still returned {}
What is the correct way to handle this? I need to find all powers of expressions of form y[x]/x
Tried HoldForm
and Verbatim
and Inactive
but can’t get it to work.
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