Re: Global variables with Octave

[Mats Jansson]

Eric Bouyoux wrote:
> 
> Hi,
> 
> I have a problem with variables in functions:
> 
> This works :
> 
> function y = toto (x)
> a = 5;
> b = 20;
> y = a*x+b;
> endfunction
> 
> for x = 0:1:20
> printf("Result = %fŠÜn",toto(x));
> endfor
> 
> This does not work :
> 
> global a = 5;
> global b = 20;
> function y = toto (x)
> y = a*x+b;
> endfunction
> 
> for x = 0:1:20
> printf("Result = %fŠÜn",toto(x));
> endfor
> 
> error: `a' undefined near line 2 column 5
> error: evaluating expression near line 2, column 5
> error: evaluating binary operator `*' near line 2, column 6
> error: evaluating binary operator `+' near line 2, column 8
> error: evaluating assignment expression near line 2, column 3
> error: called from `toto'
> error: evaluating argument list element number 2
> 
> Is anyone able to help me.
> 
> Regards.
> 
> Eric Bouyoux.

You have to tell the function to use the global variables:

global a = 5;
global b = 20;

function y = toto (x)
  global a
  global b
  y = a*x+b;
endfunction

Regards,
Mats



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