initial commit / add all books

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diff --git a/3720/CH4/EX4.3/Ex4_3.sce b/3720/CH4/EX4.3/Ex4_3.sce
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+//Example 4_3
+clc;clear;funcprot(0);
+//Given values
+x=2;
+y=3;
+// Analysis
+function[ax,ay]=vecac(x,y)
+    [X,Y] = meshgrid(x,y);
+    ax = 0.4+0.64*X;
+    ay=-1.2+0.64*Y;
+endfunction
+x = linspace(-2,2,5);
+y = linspace(0,5,6);
+[ax,ay]=vecac(x,y);
+[ax1,ay1]=vecac(2,3);
+printf('\nThe material acceleration at point (x=2m,y=3m),a_x=%0.2f m/s^2 and a_y=%0.2f m/s^2',ax1,ay1);
+champ(x',y',ax',ay'); 
+xgrid(1);
+xtitle('Scale:10 m/s^2');
+xlabel('x');
+ylabel('y');