How to get numbers from char array?

Question

David Mabwa 2020-8-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/577726-how-to-get-numbers-from-char-array

编辑： Adam Danz 2020-8-10

采纳的回答： Adam Danz

I have an array of characters that are produced from a fitSVMposterior

'@(S)sigmoid(S,-1.588276e+00,-2.598747e-01)'

I need to access the numbers in this array but don't know how.

Might anyone know how to do so?

Thanks

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Answer 1

Adam Danz 2020-8-10

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/577726-how-to-get-numbers-from-char-array#answer_477682

编辑：Adam Danz 2020-8-10

Assuming your string is named, str,

str = '@(S)sigmoid(S,-1.588276e+00,-2.598747e-01)'; 
numstr = regexp(str,'(-)?\d+(\.\d+)?(e(-|+)\d+)?','match')
% numstr =
%   1×2 cell array
%     {'-1.588276e+00'}    {'-2.598747e-01'}

to convert to double,

 num = str2double(numstr)
 
%  num =
%       -1.5883     -0.25987

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David Mabwa 2020-8-10

Worked like a charm. Thank you very much!

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Answer 2

Shae Morgan 2020-8-10

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/577726-how-to-get-numbers-from-char-array#answer_477679

编辑：Shae Morgan 2020-8-10

str2double(char_array)

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Adam Danz 2020-8-10

编辑：Adam Danz 2020-8-10

This will not work when non-numeric values are in the character array.

Otherwise, when the string contains only a numeric representation, this is a good solution.

Shae Morgan 2020-8-10

excellent point!

better solution below

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