Dear all

I compute the solution of first order nonlinear ode, supplied to initial condition.

The code is written, the exact solution is derived.

 plot the solution in a small interval like (0,1/5) I see that there is no difference between exact and semi-analytical soluton.

But, If I plot the solution in other interval like (0,1) or (0,2), It is noticed that the semi-analytical solution is different to the exact solution. 
Thansk you in advance for your help 

test3.mw

Dear all
Dear all, is  there any Maple code available to solve the heat  two dimensional heat equations using Rk4. The second derivative will be replaced using Finite difference, so that we get a linear system of odes.  
Thank you for any help 

Dear all

How can I show using maple that the function g(x,y,z) =f(x,y,z)- 4 2^1/2 is strictly positive

strictly_positive_function.mw

thank you for your help 

Dear I have 

Vectors of locations points 

X=[ 1 , 2] ; 

Y =[ 6 , 7 ] 

I would like to point of the point of this grid a vertical bars with different given length...how can I do this using maple or matlab 

Dear all

I have a second order PDE, i used pdesolve but no solution obtained, why?

pdsolve_pde.mw

thanks