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The 3d n body pendulum example takes too long to run #470

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moorepants opened this issue Oct 13, 2022 · 3 comments
Open

The 3d n body pendulum example takes too long to run #470

moorepants opened this issue Oct 13, 2022 · 3 comments
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@moorepants
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On my computer it takes:

To numerically integrate an intervall of 25.000 sec the routine cycled 20243 times and it took 555.632 sec

Each example needs to run in, ideally, less than 30 seconds. The docs won't even finish building on readthedocs.org with this long example.
@moorepants
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I changed the interval from 25 seconds to 2 seconds to get the time down.

@moorepants
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Setting to a 2 second interval gives: it took 6.905 sec to set up Kanes equations
Starting values: [0.2, 0.2, 0.2, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 7.5, 0.0, 0.0, 7.5, 0.0, 0.0, 7.5, 0.0]
shape of resultat (200, 18)
Integration finished successfully
To numerically integrate an intervall of 2.000 sec the routine cycled 826 times and it took 7.787 sec

@moorepants
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Peter noted that using cse in lambdify helps the speed tremendously. But we will need to get sympy > 1.9 working first.

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