Problem 3.1 Find 8x8 DFT matrix using dftmtx and perform DFT of the following se- quences using (1) matrix multiplication and (2) fft command. Do you get the same result? (a) x1= [1:8]; (b) x2=ones (1,8); (c) x3= [1 1 1 0 0 0 0 0]; Problem 3.2 Write your own function mydt fmtx.m (without using dftmtx command) which will behave the same as dftmtx command. This function should take the signal length as the input. Let D-mydftmtx (16) and find D*D' and D' *D. Comment.