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MathGroup Archive 2006

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Re: How to extract functions from a list and call them with any argument?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg65932] Re: [mg65919] How to extract functions from a list and call them with any argument?
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Mon, 24 Apr 2006 06:01:30 -0400 (EDT)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

funclist={Sin[x],x^3,Cos[x]^2};

Use Set rather than SetDelayed

Clear[f];
f[x_]=funclist[[1]];

f[2]

sin(2)

or use Evaluate with SetDelayed

Clear[f];
f[x_]:=Evaluate[funclist[[1]]];

f[3]

sin(3)


Bob Hanlon

> 
> From: dmp55 at sympatico.ca
To: mathgroup at smc.vnet.net
> Subject: [mg65932] [mg65919] How to extract functions from a list and call them with 
any argument?
> 
> I have a list of functions, i.e.,
> 
> funclist = {Sin[x], x^3, Cos[x]^2}.
> 
> I can extract each of the functions, like
> 
> In[1]:=funclist[[1]]
> Out[1]=Sin[x]
> 
> , but I don't know how to call these functions with a general argument.
> If I type
> 
> In[2]:=funclist[t][[1]]
> 
> , I get
> 
> Out[2]=t
> 
> instead of Sin[t] (or t^3 or Cos[t]^2)
> 
> What I would like is to extract a function from the list and to call it
> with any argument, as it was defined in a standard way:
> f[x_]:=Sin[x].
> 
> Dom
> 
> 


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