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Re: FunctionQ?

• To: mathgroup at smc.vnet.net
• Subject: [mg113324] Re: FunctionQ?
• From: "Nasser M. Abbasi" <nma at 12000.org>
• Date: Sat, 23 Oct 2010 07:07:57 -0400 (EDT)
• References: <i9r7vd$hoo$1@smc.vnet.net>
• Reply-to: nma at 12000.org

On 10/21/2010 10:37 PM, Sam Takoy wrote:
> Hi,
>
> How does one tell whether a variable is a function?

one way, for Mathematica functions:

isFunction[name_String]:=If[Length[SyntaxInformation[Symbol[name]]]>0,True,False]

isFunction["Plot"]
True

isFunction["LinearSolve"]
True

isFunction["mikeyMouse"]
False

isFunction["Joined"]
False

For the rest may be ? and ?? can be of help.

> More specifically, how does one tell whether a variable is a function of
> two arguments?
> Finally, how does one tell whether a variable is a function of two
> arguments that returns an array?
>
> Many thanks in advance,
>
> Sam
>

--Nasser