initial commit / add all books

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+clc;

+close();

+clear();

+//page no 309

+//prob no. 9.3

+//input graph

+t=[0:.1:15-.1];

+y=[(1/9)*(0:.1:1)^2 (1/8)*(1.1:.1:1.9)^2.1];

+y=[y (7/8)*sin(2*%pi*t(21:150)/18.5)];

+plot(t,y);

+y=8*y;   

+//quantized form

+y1=[];

+for i=1:10:150

+    for m=-7:7

+        if y(i) < m+0.5 then

+            break();

+        end

+     end

+     

+    y1=[y1 m*ones(1:10)]

+end

+y1=y1./8;

+plot2d(t,y1,[5]);

+a=gca(); // Handle on axes entity

+a.x_location = "origin"; 

+a.y_location = "origin"; 

+// Some operations on entities created by plot2d ...

+a=gca();

+a.isoview='off'; 

+a.children // list the children of the axes

+xtitle('Analog and quantized signals','t,ms','Normalised signal level')

+xgrid()