Hi Palguna,
The equations are in the attachment. rect(t) is a rectagle function, = 1 for -1/2<= t <= 1/2, 0 otherwise. That's intended to describe a continous function. For an N-point discrete window, the function is evaluated at N equally spaced points between and including
-1/2 +1/(2N) and 1/2 -1/(2N).
The reference is a freely available Sandia report, SAND2017-4042, Catalog of Window Taper Functions
for Sidelobe Control, Armin W. Doerry. You should be able to find these same expressions in taylorwin.
