initial commit / add all books

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diff --git a/1332/CH19/EX19.3/19_3.pdf b/1332/CH19/EX19.3/19_3.pdf
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+++ b/1332/CH19/EX19.3/19_3.pdf
diff --git a/1332/CH19/EX19.3/19_3.sce b/1332/CH19/EX19.3/19_3.sce
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+//Example 19.3

+//Simple Explicit Method

+//Page no. 658

+clc;clear;close;

+

+c=-2;dt=0.07;dx=0.2;

+r=abs(c)*dt/dx;

+printf('\n  x\ti\t|\tj -->\t')

+for i=0:6

+    printf('  %i\t',i)

+end

+printf('\n  |\t|\t|\tt -->\t')

+for i=0:6

+    printf('%.3f\t',i*dt)

+end

+printf('\n---------------------------------------------------------------------------------------')

+for j=1:6

+    printf('\n %.1f\t%i\t|\t\t',(j-1)*dx,j-1)

+    for i=1:7

+        if i==1 then

+            u(j,i)=0;

+        elseif j==1 then

+            u(j,i)=1

+        else

+            u(j,i)=(1-r)*u(j,i-1)+r*u(j-1,i-1)

+        end

+        printf('%.3f\t',u(j,i))

+    end

+end
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