Re: Assign value to variable

*To*: mathgroup at smc.vnet.net*Subject*: [mg111243] Re: Assign value to variable*From*: Bill Rowe <readnews at sbcglobal.net>*Date*: Sun, 25 Jul 2010 01:57:00 -0400 (EDT)

On 7/24/10 at 5:07 AM, miguelwon at gmail.com (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[#]]], #] & /@ Range[5]; {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.