Q- using MATLAB make a code , take a vector have 12 point "N=12 ,M=4, L=3", then convert to function that take N,M parameters and return ,X " DFT" using Divide and Conquer Approach .

-store the signal row wise , compute the L-point DFT at each column , multiply the resulting array by the factor W^pm , compute the M-point of each row , read resulting array column -wise . .