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

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

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
Edited: 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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