How to check if a string contains only numbers?

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Rahul Pillai 2017-12-14

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https://ww2.mathworks.cn/matlabcentral/answers/373000-how-to-check-if-a-string-contains-only-numbers

评论： YT 2017-12-15

采纳的回答： Walter Roberson

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Is there any expression for this ? For example :

              -100   should return 1
               a100b should return 0
              0.1256 should return 1   and so on

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采纳的回答

Walter Roberson 2017-12-14

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https://ww2.mathworks.cn/matlabcentral/answers/373000-how-to-check-if-a-string-contains-only-numbers#answer_296294

The easiest way is to check if str2double() returns nan. Otherwise you need to parse the string and there are a number of odd cases to account for in scientific notation.

Note: if you do use str2double() you should give some consideration as to what result you want for complex numbers, whether those are to be treated as numeric or as invalid because of the 'i' or 'j' present.