Mathematica 9 is now available
Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2008

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: How to test if list of arguments are numeric

  • To: mathgroup at smc.vnet.net
  • Subject: [mg89533] Re: How to test if list of arguments are numeric
  • From: "Michael A. Gilchrist" <mikeg at utk.edu>
  • Date: Thu, 12 Jun 2008 02:57:42 -0400 (EDT)
  • References: <g2nu84$ej1$1@smc.vnet.net> <484FB895.6070505@gmail.com>

Hi Jean (and Oliver and Szabolcs),

Thank you all for your solutions.  I didn't realize that VectorQ could take 
that optional argument.

Mike


On Wed, 11 Jun 2008, Jean-Marc Gulliet wrote:

> Michael A. Gilchrist wrote:
>
>> I'm trying to use a function with NMinimize and running into problems with 
>> holding off its evaluation until NMinimize passes real values. 
>> Essentially, I have something like this
>> 
>> TestFunction[avec_]:=Module[{},
>> ..
>> ..
>> ..
>> ]
>> 
>> Where avec should be a list of real numbers.  I know that to ensure avec is 
>> a list I use avec_?ListQ, but I need to ensure that avec is a list of real 
>> numbers (not the symbols that NMinimizes passes).
>> 
>> Unfortunately, I have no idea what the correct syntax is.  Could someone 
>> please clue me in on this?
>
> The following should do it:
>
> TestFunction[avec_?(VectorQ[#, NumericQ] &)]:=Module[{},
> ..
> ..
> ..
> ]
>
> See "How do I write a function which evaluates only when the argument is a 
> number?" at
>
> http://support.wolfram.com/mathematica/kernel/features/evalwhennumber.html
>
> Regards,
> -- Jean-Marc
>


  • Prev by Date: What "style"s are available in a notebook?
  • Next by Date: Re: Re: snippets
  • Previous by thread: Re: How to test if list of arguments are numeric
  • Next by thread: DiffMaps package