Passing global variables into sqp

[Alebron]

Is it possible to pass global variables into the cost function (phi) in sqp?
This code doesn't work:

global a;
a = 3;
global b;
b = 4;

function r = phi(x)
  a
  b
  x
  r=(x(1)-a)^2+(x(2)-b)^2
endfunction

x0=[0;0];

sqp(x0, @phi, [], [])

I get: "error: `a' undefined near line 7 column 3"

Any ideas?

Thanks,

Agustin
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