How can I turn a string into a function and obtain the result?

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Brent King
Brent King 2018-7-29
回答： Titus Edelhofer 2018-7-30
To be more precise I have a sequence of functions that result in several outputs that all look similar to this:
'((5/5)+5)+(5*((5*5)-5))'
I tried using str2func but that didn't seem to work.
  2 个评论
per isakson
per isakson 2018-7-29
" that didn't seem to work." Always describe exactly what you did and what error message was returned.
Try
>> foo = str2func('@() ((5/5)+5)+(5*((5*5)-5))');
>> foo()
ans =
106
>>
Brent King
Brent King 2018-7-29
Thank you that seems to have done the trick.
I do apologize for the lack of detail, this is my first time posting a question.

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采纳的回答

Titus Edelhofer
Titus Edelhofer 2018-7-30
Hi Brent,
maybe you can describe a little more what you are trying to achieve? Your "function" has no input, so you could basically evaluate the string:
str = '((5/5)+5)+(5*((5*5)-5))';
value = eval(str);
If you indeed have a function, e.g.
str = '2*exp(x)';
then Per's suggestion of using the "@" and str2func works fine:
fcn = str2func(['@(x) ' str]);
Regards, Titus

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