Expression is too large for MATLAB to evaluate

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Gabriele Porcelli
回答： Walter Roberson 2024-12-3，7:49
Hello everybody, I have a 6x36 symbolic matrix and I wanted to make it a function handle with function matlabFunction. I need to do this because later on I need to evaluate this 6x36 matrix numerically and I've noticed that numerical substitution with function feval is much faster than function subs. Unluckily when I use matlabFunction with the matrix in input I obtain this errore code:
Error using symengine
Error: Expression is too large for MATLAB to evaluate.
Error in symengine
Error in sym/matlabFunction (line 190)
g = symengine('makeFhandle',varnames,body);
I've also tried to simplify the symbolic matrix with the opportune function but the result was the MATLAB crashed twitce. I'm open to other suggestion on how evaluate numerically a symbolic matrix.

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回答（2 个）

BhaTTa
BhaTTa 2024-12-3，3:49
  1 个评论
Walter Roberson
Walter Roberson 2024-12-3，7:47
No, that answer says that piecewise() now exists as a Symbolic Toolbox function. It has nothing to do with "Expression is too long for MATLAB to evaluate"

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Walter Roberson
Walter Roberson 2024-12-3，7:49
Unfortunately, the expression is simply too large for the Symbolic Toolbox to handle.
You will need to do something like taking children() several times, converting the children to function handles, and piecing together calls to the function handles with appropriate joining functions.

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