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Re: local or global variables

  • To: mathgroup at smc.vnet.net
  • Subject: [mg111011] Re: local or global variables
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Fri, 16 Jul 2010 07:00:03 -0400 (EDT)

Either should work if you use /. rather than \.

Clear[f]

f[x_] := Module[{},
  sigma /. {{sigma -> 1}, {sigma -> 2}}]

f[5]

{1,2}

Clear[f]

f[x_] := Module[{sigma},
  sigma /. {{sigma -> 1}, {sigma -> 2}}]

f[5]

{1,2}


Bob Hanlon

---- lynette <xiaochu at gmail.com> wrote: 

=============
HI:
    I have encountered a problem as follow, can anyone help? thanks a
lot.


	when sigma is defined as local variable, the function doesn't work
	 f[x_]:=Module[
		{sigma},
		sigma \. {{sigma->1},{sigma->2}}
	]
	when sigma is NOT defined as local variable, the function works

	f[x_]:=Module[
		{},
		sigma \. {{sigma->1},{sigma->2}}
	]



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