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Re: Assign value to variable

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  • Subject: [mg111243] Re: Assign value to variable
  • From: Bill Rowe <readnews at>
  • Date: Sun, 25 Jul 2010 01:57:00 -0400 (EDT)

On 7/24/10 at 5:07 AM, miguelwon at (miguelwon) wrote:

>I'm working with some expressions that are dependent of several
>variables co1, co2, ... , con. I would like to know how can I assign
>values iteratively to some of these variables. I tried:

>For[i=1,i<=100,i++, Symbol["co"<>ToString[i]]=0;

>but it doesn't work. For each iteration it says coi is Protected.
>Can someone help me?

Assuming the variables you want to assign values to do not have
values already assigned to them, then the following will do what
you want.

In[1]:= Set[Evaluate[ToExpression["c" <> ToString[#]]], #] & /@
{c1, c5}

Out[2]= {1,5}

This doesn't work if the variables have values assigned to them
since the Evaluate will cause the variable to be evaluated to
its value resulting in a non-sensical attempt to assign a number
to a number.

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