need urgent help I'm a beginner using matlab, I saw this function working: function une=coloca(u) num=1:256; val=288-(u*3000); une(1,:)=val; une(2,:)=num; but when I try to use it, this error appears: ??? Input argument "u" is undefined. Error in ==> une at 3 val=288-(u*3000); What could be the problem? Could someone help me ?