String to matlabFunction is there any way to replace sym('StringFunction') in R2016a

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I wanted to create a simple GUI that take a function edited in edit text and convert it from a string to an anonymous function to use it in optimization problem, first I planned as follows:
strg = 'a*X-bX^2+c';
symStrg = sym(strg);
funStrg = matlabFunction(symStrg);
and processed with the resulting anonymous function, but this seems to be no longer supported starting from R2016a see here ,am I right? and if yes, is there any work around to have a GUI taking edited function as string and convert it to Matlab function that can be used in optimization problem or plotting or any other staff.

Accepted Answer

Walter Roberson
Walter Roberson on 26 Apr 2016
No, it is still supported in R2016a; it will be removed in a later release. It does emit a warning, though.
Remember, by the way, to have a multiplication between your b and your X^2

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