Re: global variables

[Michal Studniarek]

You are indeed right!!! Sorry for my mistake. It looks like the problem is solved:

You WILL MODIFY the value of a global variable by using it like this:

global var x=2;

function test()

global x;

x=4

endfunction;

and you WILL NOT MODIFY the value of it when you pass it as a parameter like this:

global var x=2;

function test(x)

x=4

endfunction;

The second way creates a copy for local use.

Regards,

Michal

2014/1/21 Mike Miller <address@hidden>

On Tue, Jan 21, 2014 at 17:39:35 +0100, Michal Studniarek wrote:
>
> I think the question was if you can define a global variable then change
> its value inside function and to have a new value available outside.
>
> In example:
>
> global x=2;
>
> function x=test()
>  global x;
>  x=4;
> endfunction
>
> Value of global variable x will be still 2. Function operates on global var x
> locally but can not change its value globaly.

In fact your example is almost exactly out of the manual and shows
that a function can indeed modify the value of a global variable, both
inside and outside the scope of the function.

See https://www.gnu.org/software/octave/doc/interpreter/Global-Variables.html

--
mike

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