Solve the ODE which uses a max() function

I have an ODE that I would like to solve in labview, but it's the max() for the third function OF. How can I integrate this into the Solver, RK4? I also apply it over a period of ten minutes (t here is in minutes), so I would put the RK4 Solver within some set time the end time to be 10 + loop with a start time register offset, or simply? I've included the variables + constants table for your reference.

I do not understand your question about the error. Comments about all numerical values are already doubled.

I found the basic problem. Column to 1 d array.vi returns an array containing a single element. This causes the Solver RK choke because it needs of 4 elements. The solution is to use only the Index table. This version converge in about 11 iterations.

The solution seems to be sensitive to the value of h, so something's not quite yet. Fixing that may depend on your knowledge of what represent equations.

I enclose the things that I've changed. In the f picker.vi I added the * as mentioned previously. I also reformatted some constants, although I think it was unnecessary. In the Main VI, I added a bunch of indicators so I could see what was going on. These indicators led me to the size of the array, I also added a waiting for me to see the results of each iteration. You will want to remove that in your final version.  I've implemented a "approximately equal" function to stop the loop. I put it as stop on an error.

I consider calculate two options outside the loop and then simply select the one you want on the inside. No time to run, but if you need hundreds or thousands of iterations to solve the equations we can add.

Lynn

Tags: NI Software

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