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+// example no. 6.20,
+// caption: solve the system of equations
+
+//1) eulercauchy  method solving simultanious ODE
+
+deff('[z]=f1(t,u,v)','z=-3*u+2*v');
+deff('[w]=f2(t,u,v)','w=3*u-4*v');
+
+
+[u,v,t] = simeulercauchy(0,.5,0,.4,.2,f1,f2)
+
+// 2)  RK4 method solving simultanious ODE
+
+
+
+[u,v,t]=simRK4(0,.5,0,.4,.2,f1,f2)
+
+