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Math Help - Runge Kutta on HP50g

  1. #1
    Junior Member
    Joined
    Sep 2010
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    Runge Kutta on HP50g

    Hi anyone knows how to write a programme that allows us to do 1st, 2nd and 4th runge kutta on HP50g graphic calculator? I found 1 programme onthe internet but it is of another language so I couldn't figure it out. For long questions, I always do it on Excel for the iterations but out of convenience, I would like to have it on the calc as well. Anyone know how?

    THANKS!!! Your help will be greatly appreciated.
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  2. #2
    Newbie Bill Zimmerly's Avatar
    Joined
    Nov 2009
    From
    Hillsboro, Missouri, USA
    Posts
    24
    Page 16-57 of the HP-50G User's Guide covers this...

    "Numerical solution of first-order ODE

    Through the use of the numerical solver (RS-NUM.SLV), you can access an input
    form that lets you solve first-order, linear ordinary differential equations. The
    use of this feature is presented using the following example. The method used
    in the solution is a fourth-order Runge-Kutta algorithm preprogrammed in the
    calculator.


    Example 1 -- Suppose we want to solve the differential equation, dv/dt = -1.5
    v1/2, with v = 4 at t = 0. We are asked to find v for t = 2.

    First, create the expression defining the derivative and store it into variable EQ.
    The figure to the left shows the ALG mode command, while the right-hand side
    figure shows the RPN stack before pressing K.

    Then, enter the NUMERICAL SOLVER environment and select the differential
    equation solver ... Etc." (Emphasis mine)
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