how to detect global vars before calling global?

[Eric Chassande-Mottin]

is it possible to know that a global variable exists
before to create it in the local workspace of a function?
with is_global, it seems impossible.

octave2.1:1> x=1;global x;
octave2.1:2> is_global("x")
ans = 1
octave2.1:3> function foo(y);is_global("x"),end;
octave2.1:4> foo(0)
ans = 0

cheers,
é.




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