how to solve the problem given in j prokaris text book fundamentals of communication system chapter 2.computer problems 2.3 and 2.5

% MATLAB script for Computer Problem 2.3. df=0.01; fs=10; ts=1/fs; t=[−5:ts:5]; x1=zeros(size(t)); x1(41:51)=t(41:51)+1; x1(52:61)=ones(size(x1(52:61))); x2=zeros(size(t)); x2(51:71)=x1(41:61); 10 [X1,x11,df1]=fftseq(x1,ts,df); [X2,x21,df2]=fftseq(x2,ts,df); X11=X1/fs; X21=X2/fs; f=[0:df1:df1*(length(x11)−1)]−fs/2; plot(f,fftshift(abs(X11))) figure plot(f(500:525),fftshift(angle(X11(500:525))),f(500:525),fftshift(angle(X21(500:525))),’--’)