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Re: pure function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg113717] Re: pure function
  • From: Albert Retey <awnl at gmx-topmail.de>
  • Date: Mon, 8 Nov 2010 05:40:50 -0500 (EST)
  • References: <ib8cre$2e1$1@smc.vnet.net>

Am 08.11.2010 09:37, schrieb Stephan:
> Hi,
> 
> I have a function that returns a pure function:
> 
> In[1]:= getFunc := Module[{a=2}, Function[{x}, a * x]]
> 
> In[2]:= f = getFunc
> 
> Out[2]= Function[{x$}, a$57 x$]
> 
> 
> Is there any way, to have the body of the returned function contain
> the actual _value_ of the local variable a, instead of the _symbol_
> ?

Use With instead of Module:

getFunc := With[{a=2}, Function[{x}, a * x]]

See the documentation of With for some more details and explanations,
and note that Function has attribute HoldAll. You might want to look at
tutorial/NonStandardEvaluation, too.

hth,

albert


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