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Matrix function Issues

Re: Matrix function Issues

what is nr in the program?

Re: Matrix function Issues

In the program "make P & T" "n" is the number of iterations and "nr" means that only every nr-th calculated value is added to the return vectors.

When I call that function I use the worksheet variable N (120000) for iteration number and worksheet n (300) gets nr in the program. I thought that 400 points are enough, so I set n to 300 (=120000/400).

When I think about it - it would make more sense if the last parameter nr would mean the number of points (at least approx.) which are returned. To make this work you could add "nr <-- floor(n/nr)" somewhere in the front before the for-loop.

Re: Matrix function Issues

Is there a way to display w_dot(P,T) at any of the given time steps? I'd like to see what is going on in the calculation for w_dot during each time increment. There should be a 5x5 matrix called w_dot during each time increment and I would like to display certain ones.

Re: Matrix function Issues

First it seems that you have a superfluous line in your program because w is not used in you calculations at all.

no+effect.png

As for the wdot values. You should be able to calculate and display them after the routine has run and you would not have to change anything in the program. The programm returns all Pressure and temperature values, so you could select the step of interest (a specific column in the resulting matrices) and feed them in wdot().

I can't try as the sheet does not work without the extern excel table, but something like the following should work:

wdot.png

Re: Matrix function Issues

What you posted comes up with an error. I'll attach the excel file so you can work with it.

Re: Matrix function Issues

You are right, the P- and T-values for each step are the rows, not the columns as I wrote. So we have to use the row selector and then transpose to get a columnvector.

wdot2.png

Re: Matrix function Issues

You could graph the values of wdot if that would help

wdot3.png

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