I'm trying to create a function and it's not working, I don't know what's wrong with it?

function gx = g(x)
x1 = find(x <-pi);
gx(x1)=-1;

x2 = find(x>=-pi & x<=pi);
xs = x(x2);
gx(x2)=cos(xs);

x3 = find(x>pi);
gx(x3)=-1;

end
x=-2.*pi;0.01;2.*pi;
gx=g(x)
plot (x,gx)

Answer 1

[the cyclist]

You need

x=-2.*pi:0.01:2.*pi;

instead of using semicolons for defining the vector.