initial commit / add all books

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diff --git a/1332/CH20/EX20.5/20_5.pdf b/1332/CH20/EX20.5/20_5.pdf
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+++ b/1332/CH20/EX20.5/20_5.pdf
diff --git a/1332/CH20/EX20.5/20_5.sce b/1332/CH20/EX20.5/20_5.sce
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+//Example 20.5

+//Nine Point Formula

+//Page no. 688

+clc;clear;close;

+

+printf('Itr\t\t U11\t\t U12\t\t U21\t\t U22\n-----------------------------------------------------------------------\n')

+for i=1:4

+    for j=1:4

+        if j==1 then

+            u(i,j)=0

+        elseif j==4

+            u(i,j)=100

+        elseif (i==1 | i==4) & j==2

+            u(i,j)=25

+        elseif i==1 | i==4

+            u(i,j)=u(i,j-1)*2

+        else

+            u(i,j)=0

+        end

+    end

+end

+for k=0:17

+    printf('  %i\t\t%.3f\t\t%.3f\t\t%.3f\t\t%.3f\n',k,u(3,2),u(2,2),u(3,3),u(2,3))

+    for i=3:-1:2

+        for j=2:3

+            u1(i,j)=(u(i+1,j-1)+u(i-1,j-1)+u(i+1,j+1)+u(i-1,j+1)+4*(u(i,j+1)+u(i,j-1)+u(i-1,j)+u(i+1,j)))/20

+        end

+    end

+    for i=3:-1:2

+        for j=2:3

+            u(i,j)=u1(i,j)

+        end

+    end

+end

+disp(u,'The Solution of the System is = ')
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