Neat trick

[bill.daly@tradition.co.uk (Bill Daly)]

There are occasions when it's handy to be able to define a function
which takes another function as a parameter. This is easy in C, but
PARI/GP complains if you try the same thing. However, I've found a quick
and dirty way of fooling GP into doing it. Here is an example:

  calc(f,x) = eval(Str(f "(x)"))

If you call this with

  calc("sin",1)

it will return sin(1).

Regards,

Bill
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