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Re: Retained Value

From: Mike Miller
Subject: Re: Retained Value
Date: Wed, 13 Jul 2016 09:16:27 -0700
User-agent: Mutt/1.6.0 (2016-04-01)

On Wed, Jul 13, 2016 at 08:44:58 -0700, Thomas D. Dean wrote:
> I have some code, that unless I clear all, does not change value when
> changed.
> X=[0,38000]
> Y=[0,3000]
> poly_deg = 4
> global P = polyfit(X,Y,poly_deg)
> P
> X=[0,38000]
> Y=[0,3000]
> poly_deg = 8
> global P = polyfit(X,Y,poly_deg)
> P
> P has the same value as before.
> What am I doing wrong?

The "global" keyword is not meant to be used with assignment. You should
declare a name as "global" and then assign to it. The global attribute
is retained any time the name is assigned to in the same scope.

As a shortcut Octave allows you to do "global foo" and "foo = 0" in one
expression, but the assignment only has an effect when the variable is
declared the first time.

Safest to stick to the Matlab compatible syntax of

  global P
  P = polyfit (...
  P = something else


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