initial commit / add all books

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+//Example 4.4 <ii>

+//Find the step response of the following impulse response.

+clc;

+t=-1:.01:1;

+for i=1:length(t)

+    if t(i)==0 then

+        del1(i)=1;del2(i)=0;

+    elseif t(i)==1 then

+        del1(i)=0;del2(i)=1;

+    else

+        del1(i)=0;del2(i)=0;

+end

+h(i)=del1(i)-del2(i);

+if t(i)<0 then

+    u(i)=0;

+else

+    u(i)=1;

+end

+end

+s=convol(h,u);

+t1=-10:.05:10;

+f=scf(0);

+plot(t1,s,'red');

+xtitle('s[t]');

+xs2jpg(0, 'EX4_4_2-plot-a.jpg');