Search for components in symbolic

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Xin 2018-5-25

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回答： Walter Roberson 2018-5-25

Hello. Let's say I have a symbolic function: exp(5*x)*x^3. Is it possible to let MATLAB automatically search for the component within the exponential part (result is 5), and the power of x (result is 3). Thanks!

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John D'Errico 2018-5-25

I'd suggest your best chance is to use string processing techniques. Do the parsing yourself, since you know what you are looking for.

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Walter Roberson 2018-5-25

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Unfortunately, this is not possible with the tools that are made available at the MATLAB level. You would need to use feval(symengine) or evalin(symengine) to invoke checking at the MuPAD symbolic engine level.

See https://www.mathworks.com/help/symbolic/mupad_ref/match.html for a useful MuPAD call.

I do not recommend dipping into MuPAD for these operations. I find the matching operations of Maple or Mathematica to be easier to work with.