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MathGroup Archive 2005

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Re: Assign a value to a variable

  • To: mathgroup at smc.vnet.net
  • Subject: [mg63009] Re: [mg62996] Assign a value to a variable
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Sun, 11 Dec 2005 04:56:32 -0500 (EST)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

Clear[a,b,c,d,e,f,g,h,i];

vars={a,b,c,d,e,f,g,h,i};

numbers=Range[9];

Set has attribute HoldFirst so that the LHS is not evaluated

Attributes[Set]

{HoldFirst,Protected,SequenceHold}

Force evaluation of the LHS of Set

rn=
    (Evaluate[vars[[
              varsPos=
                Random[Integer,{1,Length[vars]}]]]]=
        numbers[[
            Random[Integer,{1,Length[numbers]}]]]);

{rn, varsPos,vars}

{3,2,{a,3,c,d,e,f,g,h,i}}

rn==vars[[varsPos]]==
  ToExpression[
    FromCharacterCode[
      ToCharacterCode["a"]+varsPos-1]]


True


Bob Hanlon

> 
> From: Ben Becker <ben.becker at gmx.de>
To: mathgroup at smc.vnet.net
> Date: 2005/12/10 Sat AM 06:03:11 EST
> Subject: [mg63009] [mg62996] Assign a value to a variable
> 
> Hi!
> 
> I have a list of variables:
> vars = {a, b, c, d, e, f, g, h, i}
> 
> and a list of numbers:
> numbers = Range[9]
> 
> Now i'd like to choose randomly a variable and a number. and then i'd 
> like to assign the number to the variable.
> I thought of somehting like that:
> 
> vars[[Random[Integer, {1, Length[vars]}]]] =
> numbers[[Random[Integer, {1, Length[numbers]}]]]
> 
> but it doesn't work.
> 
> i hope you have an idea!
> 
> thank you for answering!
> 
> MFG Ben
> 
> 


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