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
- References:
- Test function argument with VectorQ and NumericQ
- From: Oliver Fochler <janitor048@googlemail.com>
- Test function argument with VectorQ and NumericQ