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diff --git a/27/CH7/EX7.3.1/Example_7_3_1.sce b/27/CH7/EX7.3.1/Example_7_3_1.sce
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+++ b/27/CH7/EX7.3.1/Example_7_3_1.sce
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+function xd=linear731(t,x)
+ xd(1)=(cos(t)*sqrt(x(1)^2+x(2)^2)*(1-x(1)^2-x(2)^2))+(cos(t)*1*sqrt(x(1)^2+x(2)^2)*cos(t))-(sqrt(x(1)^2+x(2)^2)*sin(t));
+    xd(2)=(sin(t)*sqrt(x(1)^2+x(2)^2)*(1-x(1)^2-x(2)^2))+(sin(t)*1*sqrt(x(1)^2+x(2)^2)*cos(t))-(sqrt(x(1)^2+x(2)^2)*cos(t));
+        //x(dot);   x(2) means y.
+        //y(dot);   x(1) means x.; 
+  endfunction
+  bound=[-4,-4,4,4];        //Bounds of x-axis and y-axis as [xmin ymin xmax ymax], change them according to your needs.
+  nrect=12;     //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=1:12
+     x0=[x(i);y(i)];
+     t0=0;
+     t=0:0.01:3000;
+     xout=ode(x0,t0,t,linear731);
+     plot2d(xout(1,:),xout(2,:));
+ end
+ xtitle('Phase Portrait','x-axis ( x )','y-axis ( y )')
+\ No newline at end of file