Return the spectral density estimator given a data vector x, window name win, and bandwidth, b.
The window name, e.g., "triangle" or "rectangle" is used to
search for a function called win_sw.
If win is omitted, the triangle window is used.
If b is omitted, 1 / sqrt (length (x)) is used.
See also: spectral_adf.
Package: octave