Thread: 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.

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)