differential equation

  1. S

    how to solve secondary differential equations with two unknowns

    I got the following equations, φ=f(Z), C is concentration, t is time, Z is distance. <!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:AllowPNG/> </o:OfficeDocumentSettings> </xml><![endif]--><!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom>...
  2. K

    Using substitute to define a user entered multi-variable function

    I have created a 4th order Runge Kutta Solver which will solve a pre-defined differential equation. I am trying to make the program more universal by allowing it to accept any user defined function. I have done this before for a polynomial but I am having problems extending that same application...

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