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+//Scilab Code for Example 3.13 of Signals and systems by

+//P.Ramakrishna Rao

+//Complex Exponential Fourier Expansion

+//A=3.14 or pi

+clear;

+close;

+clc;

+T0=4;

+t=-5.99:0.01:6;

+t_temp=0.01:0.01:T0/2;

+s=length(t)/length(t_temp);

+x=[];

+for i=1:s

+    if modulo(i,2)==1  then

+        x=[x -ones(1,length(t_temp))*%pi];

+    else

+        x=[x ones(1,length(t_temp))*%pi];

+    end

+end

+figure(1);

+title('Signal');

+ylabel('x(t)');

+xlabel('t');

+plot(t,x,'r')

+w0=%pi/2;

+for k=-10:10

+    cc(k+11,:)=exp(-%i*k*w0*t);

+    ck(k+11)=x*cc(k+11,:)'/length(t);

+    if abs(ck(k+11))<0.01 then

+    ck(k+11)=0;

+    else if real(ck(k+11))<0.1  then

+    ck(k+11)=%i*imag(ck(k+11));

+    end

+    end

+    if k==0 then

+        c0=ck(k+11);

+    end

+end 

+q=abs(ck);

+figure(2);

+title('Magnitude Spectrum');

+ylabel('|cn|');

+xlabel('fo');

+f=-10:1:10;

+plot2d3(f,q)