compass draws arrows starting from the origin toward the cartesian points defined by the input components on a polar grid.

With a single complex input Z, the real parts are the horizontal components and the imaginary parts are the vertical components; this is equivalent to compass(real(Z), imag(Z)).

With two real inputs U and V, each pair (U, V) is a cartesian point and the arrow points from the origin to that point. When U and V are matrices, one arrow is drawn for each element.

Each vector is drawn as a Line object made of a shaft from the origin and a short two-segment arrowhead, over a polar reference grid. h = compass(...) returns a column vector of Line objects, one per vector.