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Re: Pattern matching in functions


On 19 Feb 2005, at 08:32, Maximilian Ulbrich wrote:
> Hi,
>
> I would like to find subexpressions using Cases.
> In the following case, I expected to find a[b] and a[c] and therefore
> get {b,c} as the result. However, I get {l,l}.
> What happens and how can I solve this?
>
> Cases[l^4*a[b][l] + l*a[c][l], x_a[y_] -> y, {0, Infinity}]
>
> Thanks,
> Max
>
>
>

Cases[l^4*a[b][l] + l*a[c][l], x_a[y_] :> First[x], Infinity]

{b,c}



Andrzej Kozlowski
Chiba, Japan
http://www.akikoz.net/andrzej/index.html
http://www.mimuw.edu.pl/~akoz/


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