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Re: Symbol function, a question
*To*: mathgroup at smc.vnet.net
*Subject*: [mg90522] Re: Symbol function, a question
*From*: "David Park" <djmpark at comcast.net>
*Date*: Fri, 11 Jul 2008 02:06:47 -0400 (EDT)
*References*: <g54om5$f1i$1@smc.vnet.net>
I'm not quite certain what your objective here is.
x95 = 100;
Notice what happens if you Trace the evaluation of the Symbol expression.
Symbol["x" <> ToString[95]] // Trace
{{{ToString[95], 95}, x<>95, x95}, Symbol[x95], x95, 100}
So the statement:
Symbol["x" <> ToString[95]] = 20
evaluates to:
100 = 20 which Mathematica baulks at.
So if you want to reset the value of the symbol why not just write:
x95 = 20
If you want x95 to change its value in other expressions when you assign a
new value to it use:
Dynamic[x95]
Evaluate that, and then evaluate in turn:
x95 = 100;
x95 = 20
and see what happens to the Dynamic[x95] output.
--
David Park
djmpark at comcast.net
http://home.comcast.net/~djmpark/
"tung tran" <tunganhtr at yahoo.fr> wrote in message
news:g54om5$f1i$1 at smc.vnet.net...
> Hi everybody, I have a question needing your help.
> Firstly, I create a variable
> x95 = 100
> Now, I want to change the value of my variable x95 to 20 ,
> so I want to use some procedure like :
>
> Symbol["x" <> ToString[95]] = 20
> my idea is to make Mathematica write the term "x95" automatically for
> me but when I use the Symbol function in this case, it gives me
> automatically 100 and I don' t know how to call only x95.
> Thank you if someone can give me a suggestion.
>
>
> Tung
>
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