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Convert a symbolic equation to a vector equation

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Daniel Wells
Daniel Wells 2011-9-8
评论： Walter Roberson 2018-11-7
I would like to be able to input a multi-variate symbolic equation into MATLAB and convert that equation into a function which takes in a vector. I know that matlabFunction() can turn this symbolic function into a function handle, but that equation does not take in a vector, but rather a list of inputs. -Is there a command which will convert my symbolic expression to a vector equation? -If not, is there a way to convert the function handle returned by matlabFunction() to one that takes in a vector?

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Walter Roberson
Walter Roberson 2011-9-8
Start with
S = vectorize(char(EXPRESSION))
To turn that in to an anonymous function depends upon your MATLAB version. If you have a very new version, you can use
f = str2func(['@(x) ' S]);
The (x) should be whatever list of symbolic names is in your symbolic expression.
If you do not have one of the very newest versions, then you:
eval(['f = @(x) ' S]);
Yes, ugly and evil, but we have to play the hand we are dealt.
  2 个评论
Daniel Shub
Daniel Shub 2011-11-28
I think f = eval(['@(x) ' S]); might be a bit safer and easier to deal with since you are not poofing a variable into the workspace.

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