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matlabFunction very slow

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Martin
Martin 2011-7-29
Hi,
I am using the symbolic math toolbox to generate analytical derivatives of single valued function in approximately 190 unknowns. This works all fine (within 3 min). However, if I use matlabFunction to generate an m-file consisting of the first-order conditions, this actually takes hours... I am even more concerned by the fact that the cpu-usage is only around 0.2 percent (I have eight cores, so it would be still below 2 percent for one core).
Why is matlabFunction so slow compared to fprintf? Is it just because it tries to optimize the output? Why does matlabFunction use only a negligible fraction of the cpu?
Thanks for your answers, Best, Martin
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Walter Roberson
Walter Roberson 2011-7-29
Related: http://www.mathworks.com/matlabcentral/answers/12491-why-is-matlabfunction-so-slow

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回答（2 个）

the cyclist
the cyclist 2011-7-29
What is the memory usage like? If you need to use virtual memory, the whole thing will slow down dramatically.
Martin
Martin 2011-7-29
Actually, it uses virtual memory in a modest way. That was my first thought as well. This should not be the problem: matlabFunction is always quite slow even for small functions. Is there a way to write the function unoptimized?

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