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Re: function definition


Concerning defining functions, Richard Mercer writes:

>y_ is considered to be different than x_. This is useful e.g. if you have
>f[x_Rational]:= and f[y_Integer]:=
>as then you can define different behaviors for different inputs, i.e.  
>"overload" the symbol f.

That's not really useful at all.  One can accomplish exactly the
same thing with

f[x_Rational]:= and f[x_Integer]:=

So Richard's explanation doesn't explain anything.  I'm inclined to
go along with the attitude mainly expressed so far on this question--
it really shouldn't work the way it does.  Maybe someone should send
a bug report to Wolfram and see what they reply...

Will Self
Billings, Montana






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