initial commit / add all books

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diff --git a/27/CH5/EX5.2.4/Example_5_2_4.sce b/27/CH5/EX5.2.4/Example_5_2_4.sce
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+clear;

+clc;

+close;

+

+disp("When the eigen values are complex, then the fixed point is either :")

+disp("1.    Center, or")

+disp("2.    Spiral.")

+

+function xd=linear524(t,x)

+    xd(1)=0*x(1)+x(2);         //x(dot);   x(2) means y.

+    xd(2)=-4*x(1)+0*x(2);     //y(dot);   x(1) means x.; 

+  endfunction

+  bound=[-14,-25,14,25];        //Bounds of x-axis and y-axis as [xmin ymin xmax ymax], change them according to your needs.

+  nrect=10;     //increase it to get more number of curves, i.e. more information will be available.

+  set(gca(),"auto_clear","off")        //hold on

+  x=linspace(bound(1),bound(3),nrect);

+  y=linspace(bound(2),bound(4),nrect);

+  x0=[];

+ 

+ for i=1:10

+     x0=[x(i);y(i)];

+     t0=0;

+     t=0:0.01:3000;

+     xout=ode(x0,t0,t,linear524);

+     plot2d(xout(1,:),xout(2,:));

+ end

+   xtitle('Phase Portrait','x-axis ( x )','y-axis ( y )')

+ figure

+ function xd=linear5242(t,x)

+    xd(1)=-x(1)-x(2);         //x(dot);   x(2) means y.

+    xd(2)=4*x(1)-x(2);     //y(dot);   x(1) means x.; 

+  endfunction

+  bound=[-14,-25,14,25];        //Bounds of x-axis and y-axis as [xmin ymin xmax ymax], change them according to your needs.

+  nrect=10;     //increase it to get more number of curves, i.e. more information will be available.

+  set(gca(),"auto_clear","off")        //hold on

+  x=linspace(bound(1),bound(3),nrect);

+  y=linspace(bound(2),bound(4),nrect);

+  x0=[];

+ 

+ for i=1:10

+     x0=[x(i);y(i)];

+     t0=0;

+     t=0:0.01:3000;

+     xout=ode(x0,t0,t,linear5242);

+     plot2d(xout(1,:),xout(2,:));

+ end

+   xtitle('Phase Portrait','x-axis ( x )','y-axis ( y )')
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