initial commit / add all books

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+//Example 7.5.2

+//Find the laplace transform of the following signal.

+clc;

+close;

+t=-10:.01:10;

+for i=1:length(t)

+    if t(i)>=0 then

+        x(i)=1;

+    else

+        x(i)=0;

+    end

+end

+s=%s;

+numfs=1;

+denfs=s;

+fs=syslin('c',numfs/denfs);

+fs1=csim('impulse',t,fs);

+disp(fs);

+f=scf(0);

+subplot(2,1,1);

+plot2d(t,x,2);

+xtitle('Phrasing');

+xgrid;

+subplot(2,1,2);

+plot2d(t,fs1,1);

+xtitle('solution');

+xgrid;

+xs2jpg(0, 'EX7_5-plot-a.jpg');