Output from while-loop at fixed values

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Arjan Marelis
Arjan Marelis 2020-3-16
评论： Arjan Marelis 2020-3-16
I am running time-dependent simulations with variable time-step size dt in seconds. I have implemented a while-loop that updates the elapsed time t_elapsed as t_elapsed + dt and stops when t_elapsed > t_total where t_total is a predefined number in seconds. Now I want to output the solution (a vector) to a text file at every x seconds, i.e. every 3600 seconds. This problem throws me of my game a bit as dt is now variable. Any help is much appreciated.
Arjan

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dpb
dpb 2020-3-16
Either compute the number of timesteps corresponding to your dt and desired frequency if dt is constant and output every N timesteps:
N=Tout/dt;
if mod(iterNo,N)==0
fprintf(fid,data)
end
or, alternatively, test the time variable modulo Tout is within dt. ismembertol might be of interest here for floating point comparisons.

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