• To: mathgroup at smc.vnet.net
• Subject: [mg17082] Re: List of function-heads
• From: tobiasoed at my-dejanews.com
• Date: Sat, 17 Apr 1999 03:34:52 -0400
• Organization: Deja News - The Leader in Internet Discussion
• Sender: owner-wri-mathgroup at wolfram.com

```Peter Breitfeld wrote:
>
> I want to create a List of function-heads like this:
> {a[1][x_],a[2][x_],...,a[n][x_]}
> (to keep this message short I'll use n=2 in the following) to assign
> these to a list of Functions, e.g
>
> {a[1][x_],a[2][x_]}={x^2,x-1}
>
> I can do that with the following command:
>
> In[1]:=fl=Table[a[i][x_],{i,2}]
> Out[1]={{a[1][x_],a[2][x_]}
>
> But then I can't write:
>
> ll={x^2,x-1}
>

Set has attribute HoldFirst, so you need to force
the evaluation of fl to get the assignement to the a's:

In[20]:=  fl=Table[a[i][x_],{i,2}]

Out[20]= {a[1][x_], a[2][x_]}

In[21]:= Evaluate[fl]={x, x^2}

2
Out[21]= {x, x }

In[22]:=
In[22]:= ??a
Global`a

a[1][x_] = x

a[2][x_] = x^2

cheers, Tobias

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