Matlab is unable to evaluate very a very long expression
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Dominik Hiltbrunner
2021 年 11 月 5 日
編集済み: Dominik Hiltbrunner
2021 年 11 月 5 日
Attached to this post is a text file containing a very long expression.
I want to evaluate this expression numerically in a Matlab function, i.e. something like this:
function result = (<long lost of all the parameters>)
result = '<this very long expression from the text file>'
end
The computer gets stuck when doing so, not returning a result even after hours of running.
Is there anything I can do to speed up the computation of very long expressions?
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Stephen23
2021 年 11 月 5 日
Note that you should replace all of the ^(1/2) with SQRT.
What sizes are the input arrays?
Are you intentionally using matrix operations instead of array operations everywhere in this code?
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Steven Lord
2021 年 11 月 5 日
How did you generate this long expression? Did you generate this using Symbolic Math Toolbox? If so consider using matlabFunction to create a function file from this expression (leaving the 'Optimize' option set to its default value of true) and see if the optimization process simplifies the computation of that expression by extracting out some common terms that it can compute once and use repeatedly.
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