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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');
+