[Date Index]
[Thread Index]
[Author Index]
Re: How to extract functions from a list and call them with any argument?
*To*: mathgroup at smc.vnet.net
*Subject*: [mg65929] Re: [mg65919] How to extract functions from a list and call them with any argument?
*From*: Andrzej Kozlowski <akoz at mimuw.edu.pl>
*Date*: Mon, 24 Apr 2006 06:01:23 -0400 (EDT)
*References*: <200604231017.GAA11838@smc.vnet.net>
*Sender*: owner-wri-mathgroup at wolfram.com
On 23 Apr 2006, at 19:17, dmp55 at sympatico.ca wrote:
> 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
>
It would be much better if your list was really a list of functions,
i.e.
funcs = {Sin, #1^3 & , Cos};
funcs[[1]][Pi]
0
funcs[[2]][3]
27
This suggests a solution to your problem: just convert your list of
expressions into a list of functions.
exprs = {Sin[x], Cos[x], x^2};
funcs = Function /@ (exprs /. x -> #1)
{Sin[#1] & , Cos[#1] & , #1^2 & }
now you can proceed as above, e.g.
funcs[[1]][Pi]
0
funcs[[3]][4]
16
Andrzej Kozlowski
Tokyo, Japan
Prev by Date:
**Re: solving a set of inequalities**
Next by Date:
**Re: How to remove extra empty lines generated when exporting to HTML?**
Previous by thread:
**Re: How to extract functions from a list and call them with any argument?**
Next by thread:
**Re: How to extract functions from a list and call them with any argument?**
| |