initial commit / add all books

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+//Example 1_7_<i>

+//Sketch the following signal.

+clc;

+clear all;

+t=-5:1/1000:5;

+for i=1:length(t)

+    if t(i)>1 then

+        x(i)=0;

+    else

+        x(i)=1;

+    end

+end

+f=scf(0);

+plot2d(t,x);

+plot(t,x,'red');

+xtitle('Required figure','t','x(t)');

+xgrid();

+xs2jpg(0, 'problem1_7_i-plot.jpg');

+//Example 1_7_<ii>

+//Sketch the following signal.

+clc;

+t=-5:1/1000:5;

+for i=1:length(t)

+    if t(i)<1 then

+        x(i)=0;

+    else

+        x(i)=1;

+    end

+end

+for i=1:length(t)

+    x1(i)=-2*x(i);

+end

+//figure

+f=scf(0);

+plot2d(t,x);

+xtitle('required figure','t','x(t)');

+xs2jpg(0, 'problem1.7.2-plot-a.jpg');

+//figure

+f=scf(1);

+plot2d(t,x1);

+plot(t,x1,'blue');

+xtitle('Required figure','t','x1(t)');

+xs2jpg(1, 'problem1.7.2-plot-b.jpg');

+