Re: Array
- To: mathgroup at smc.vnet.net
- Subject: [mg69245] Re: [mg69220] Array
- From: "Adriano Pascoletti" <pascolet at dimi.uniud.it>
- Date: Sun, 3 Sep 2006 23:46:30 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Bruce Colletti wrote ..
> The command:
>
> {A[1], A[2], A[3]} = {1, 2, 3}
>
> assigns a value to each A-variable. However, the command:
>
> Array[A,3] = {1,2,3}
>
> generates an error message.
>
> What is the difference between the two lines?
>
> Thankx.
>
> Bruce
>
Array[A,3] is the list {A[1],A[2],A[3]} only after evaluation so
In[2]:=
Evaluate[Array[A, 3]] = {1, 2, 3}
Out[2]=
{1, 2, 3}
does what you want:
In[3]:=
DownValues[A]
Out[3]=
{HoldPattern[A[1]] :> 1, HoldPattern[A[2]] :> 2,
HoldPattern[A[3]] :> 3}
Adriano Pascoletti