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MathGroup Archive 2006

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RE: Variables Within Homemade Functions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg69601] RE: [mg69590] Variables Within Homemade Functions
  • From: "David Annetts" <davidannetts at aapt.net.au>
  • Date: Sun, 17 Sep 2006 06:57:25 -0400 (EDT)

Hi Gregory,

> How can I ensure that variables in my home made function do 
> not conflict with variables with the same name outside the 
> function?  Say I have a variable, t, whose value in my 
> notebook is 17.  I've brought in a function from another 
> notebook, myFunction, that contains a variable named t, and 
> in running the function, t will take on a value.  
> Unfortunately, both t's are the same.  Is there any way to 
> make the t within the my function a local variable just like 
> index counters in the Table and Do functions?

You can use either Module[] or Block[] to localise a variable.

	t = 20;
	newt[a_] := Module[
      	{t},
	      t = a
      	];
	{t, newt[#]} & /@ Range[10]

Regards,

Dave.


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