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MathGroup Archive 2011

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Re: Visibility of value of variable bindings in module

  • To: mathgroup at smc.vnet.net
  • Subject: [mg121232] Re: Visibility of value of variable bindings in module
  • From: Bill Rowe <readnews at sbcglobal.net>
  • Date: Mon, 5 Sep 2011 07:07:03 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

On 9/4/11 at 6:05 PM, cawright.99 at gmail.com (caw) wrote:

>Module[{x = Sum[i, {i, Length[{1, 2, 3}]}], y = x + 1}, Print[y];
>Print[x]]

>prints out:

>1 + x
>6

>So, in the variable declaration section of the Module statement, the
>binding of x to 6 isn't visible to y. (It's a bit like let and let*,
>but not)

>Is there a form which will allow the bindings to be visible within
>the variable declaration section?

Not using Module. But clearly you could do

Module[{x = Sum[i, {i, Length[{1, 2, 3}]}], y}, y = x + 1; Print[y];
 Print[x]]

7

6

Or you could use Block instead of Module

Block[{x = Sum[i, {i, Length[{1, 2, 3}]}], y = x + 1}, Print[y];
 Print[x]]

7

6





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