Signal incident directions in degrees.
be either a 2-by-M matrix or a row vector of length M.
ANG is a 2-by-M matrix, each column
of the matrix specifies the direction in the form [azimuth; elevation].
The azimuth angle must be between –180 and 180 degrees, inclusive.
The elevation angle must be between –90 and 90 degrees, inclusive.
ANG is a row vector of length M, each
element specifies a direction's azimuth angle. In this case,
the corresponding elevation angle is assumed to be 0.