Re: Newbie Programming question

*To*: mathgroup at smc.vnet.net*Subject*: [mg53438] Re: Newbie Programming question*From*: "John Jowett" <John.Jowett at cern.ch>*Date*: Wed, 12 Jan 2005 03:41:08 -0500 (EST)*Organization*: CERN*References*: <crvtn6$144$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

"Kerry Kim" <kjkim at u.washington.edu> wrote in message news:crvtn6$144$1 at smc.vnet.net... > Hello, > > Is there any way in Mathematica to store/assign a value to a variable > whose name is in a string? In other words something like this: > > i = 17; > foo="var" + ToString[i]; > SomeFunctionThatConvertsStringToSymbolName[foo] = 17; > > and then assign some value (say, 23) to the variable whose name is > contained in the foo string? (i.e. var17=23) > > Thanks! > One possibility using StringJoin (StringJoin["a","b"} is also written as "a"<>"b"): i=17; foo = "var" <> ToString[i]; ToExpression[foo <> "=23"] Since you describe yourself as a "newbie", perhaps you will not mind my suggesting an alternative approach. I remember that when I came to Mathematica from other programming languages, I often wanted to do the same sort of thing. Now I would find it more natural (and simpler) to define a function to store this information: i=17; var[i]=23 Note that this defines the value of the function for a particular argument (17) because I did not write var[i_]. Also note that var is not a list (there is no need to define var[1], say). And of course it may be convenient to use non-integer arguments, e.g., var["North"]=29 To find out what var contains, type ??var John Jowett