Find only numeric strings on cellstr array.
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I'd like to know the index of the "numerical strings" within a cellstr array.
arr = {'123', 'Hola', 'my', 'String', '', '1453', 'stay'};
A correct output will give me index 1 and 6.
isnumeric contained within cellfun doesn't work well here, I'd have to use it in combination with something else but I don't know exactly what that might be.
Any help is appreciated.
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Krishna Sutar
le 15 Juin 2021
From my understanding you want to find the indexes of the strings in the cell string array that are numerical. Here is the code which might help you:
arr = {'123', 'Hola', 'my', 'String', '', '1453', 'stay'};
idx = find(~isnan(str2double(arr)))
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Walter Roberson
le 15 Juin 2021
arr = {'123', 'Hola', 'my', 'String', '', '1453', 'stay'};
find(~cellfun(@isempty, regexp(arr, '^\d+$', 'once')))
find(matches(arr, lineBoundary + digitsPattern + lineBoundary))
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Stephen23
le 15 Juin 2021
Modifié(e) : Stephen23
le 15 Juin 2021
Writing regular expressions or pattern matching that robustly detects all valid number formats is not such a trivial task... it is more reliable to let MATLAB do the heavy lifting:
arr = {'123', 'Hola', 'my', 'String', '', '1453', 'stay', '-1.234', 'NaN', '9e-87'};
idx = strcmpi(arr,'NaN')|~isnan(str2double(arr))
find(idx)
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