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Re: Test function argument with VectorQ and NumericQ

  • To: mathgroup at smc.vnet.net
  • Subject: [mg107315] Re: [mg107305] Test function argument with VectorQ and NumericQ
  • From: DrMajorBob <btreat1 at austin.rr.com>
  • Date: Tue, 9 Feb 2010 02:43:51 -0500 (EST)
  • References: <201002081254.HAA07544@smc.vnet.net>
  • Reply-to: drmajorbob at yahoo.com

For instance,

Clear[f]
f[list : {__?NumericQ}, y_?NumericQ] := {y, list}

f[{1, 2, 3}, 4]

{4, {1, 2, 3}}

Bobby

On Mon, 08 Feb 2010 06:54:52 -0600, Oliver Fochler  
<janitor048 at googlemail.com> wrote:

> Hi there,
>
> in order to get my NIntegrate running properly it seems that I need to
> ensure that my functions actually take numeric arguments (without
> NIntegrate trying to do some symbolic stuff before).
>
> For a simple case something like
>
> f[x_?NumericQ] := (stuff)
>
> seems to work fine. However, I do use vectors (lists) as function
> arguments, i.e. f[x_, y_]:= (stuff) needs to be called as f[ {1,2,3},
> 4].
> How do I test this for numerical values? I know that I can use
> VectorQ[ x, NumericQ ] to check whether x is a vector that contains
> only numeric values.
>
> But how do I combine this into a pattern test, that can be used in an
> argument list?
> I would appreciate any help!
>
> Cheers,
> Oliver
>


-- 
DrMajorBob at yahoo.com


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