Converting string to function/number
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Hello, sorry to bother your time. So in this case, my problem is, i'm trying to design an app using app designer that can take user input in string and convert it into numbers. However, when i try to use some mathematical function like 'sin, cos, exp' etc, as an input, i want those strings to be converted into the mathematical function as they were stated. How can i achieve this?
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Stephen23
le 27 Mai 2022
Modifié(e) : Stephen23
le 27 Mai 2022
"How can i achieve this?"
If you are interested in writing debuggable, robust, secure code and have only a limited number of such functions then use SWITCH or a cell array of explicit function handles or similar.
If you are happy with the risks of allowing the user to be able to run anything then use STR2FUNC.
Réponses (3)
Rik
le 26 Mai 2022
The way to avoid eval in this case is to use str2func:
f=str2func('cos');
f(pi)
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Walter Roberson
le 27 Mai 2022
str2sym()
matlabFunction is commonly used together with str2sym()
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