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MathGroup Archive 2006

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RE: Not accepting function as parameter

  • To: mathgroup at smc.vnet.net
  • Subject: [mg71730] RE: [mg71681] Not accepting function as parameter
  • From: "Mark Harder" <harderm at onid.orst.edu>
  • Date: Tue, 28 Nov 2006 06:03:34 -0500 (EST)

	When I inserted Print[width] before f[width] in the definition of
happy and ran the program, it wouldn't even execute the Print[].  I imagine
this was because happy couldn't match Sin with _Function.  So I removed the
Function requirement and for simplicity also the Module structure.  Then I
created a function out of f and named it fnc.  The following works.

Clear[happy]
happy[ f_, a_Integer, b_Integer] :=
  (fnc = f[#] &;
    width = N[(b - a)/1000 ];
    ans = fnc[width] )

happy[Sin, 1, 21]
   0.0199987

-Mark Harder




> -----Original Message-----
> From: wooks [mailto:wookiz at hotmail.com]
> Sent: Sunday, November 26, 2006 12:49 AM
> To: mathgroup at smc.vnet.net
> Subject: [mg71681] Not accepting function as parameter
> 
> This is a piece of experimental code. The function happy does not
> evaluate whenever I pass f as a parameter as in the example below.
> 
> Clear[happy]
> happy[ f_Function, a_Integer, b_Integer] := Module[{width = (b -
> a)/1000},
>        f[width]];
> 
> happy[ Sin, 1, 21]
> 
> I'd be grateful for help.
> 



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