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**I have been asked to apply a suitable window to a data set, for this I have chosen Von Hann's approach**

**This is the formula I know must be used**

w(n) = 0.5-0.5 cos (2* PI* n/N)

where n = 0,1,2,3....N-1

N= number of terms

My question is how do I apply this to an already given data set, with N=3144? Do I simply use n=0,1,2 or other values.