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How to get numbers from char array?

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David Mabwa
David Mabwa on 10 Aug 2020
Edited: Adam Danz on 10 Aug 2020
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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Accepted Answer

Adam Danz
Adam Danz on 10 Aug 2020
Edited: Adam Danz on 10 Aug 2020
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
David Mabwa on 10 Aug 2020
Worked like a charm. Thank you very much!

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More Answers (1)

Shae Morgan
Shae Morgan on 10 Aug 2020
Edited: Shae Morgan on 10 Aug 2020
str2double(char_array)

  2 Comments

Adam Danz
Adam Danz on 10 Aug 2020
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
Shae Morgan on 10 Aug 2020
excellent point!
better solution below

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