string that may or may not need to be converted to num...

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David Pesetsky
David Pesetsky 2018-9-24
编辑： Bish Erbas 2018-9-24
I am bringing a string into a function. I need to convert it to num ONLY if it's intended as a number like 2, 40, 100... but when the user enters it as something else, leave it as a string. Can that be done?
Thanks!

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Bish Erbas
Bish Erbas 2018-9-24
编辑：Bish Erbas 2018-9-24
Yes. Take a look at the function below:
str2num
https://www.mathworks.com/help/matlab/ref/str2num.html
Edit: OP clarified their question and one way to accomplish what they need would be using the following function:
https://www.mathworks.com/matlabcentral/fileexchange/52925-words-to-number
Edit2: Use str2double instead. See comments section for details.
https://www.mathworks.com/help/matlab/ref/str2double.html
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Bish Erbas
Bish Erbas 2018-9-24
@Stephen Cobeldick is absolutely right. Thanks for the helpful reminder. Old habits die hard. I gotta learn to remember using the more efficient str2double

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Walter Roberson
Walter Roberson 2018-9-24
str2double() and test for nan, keep the original if you got nan.

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