Angle in u/v space, specified
as a two-row matrix. Each column of the matrix represents a pair of
coordinates in the form [u; v].
Each coordinate is between –1 and 1, inclusive. Also, each
pair must satisfy u^{2} + v^{2}≤
1.

Phi and theta angles, returned as a two-row matrix. Each column
of the matrix represents an angle in degrees, in the form [phi; theta].
The matrix dimensions of PhiTheta are the same
as those of UV.

The φ angle is the angle from the positive y-axis
toward the positive z-axis, to the vector's
orthogonal projection onto the yz plane. The φ
angle is between 0 and 360 degrees. The θ angle is the angle
from the x-axis toward the yz plane,
to the vector itself. The θ angle is between 0 and 180 degrees.

The figure illustrates φ and θ for a vector that
appears as a green solid line. The coordinate system is relative to
the center of a uniform linear array, whose elements appear as blue
circles.

The coordinate transformations between φ/θ and az/el are
described by the following equations