Remove numbers during preprocessing

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Rachele Franceschini 2022-9-30

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评论： Ergin Sezgin 2022-9-30

I would like to remove numbers within text. I have this function or script for the preprocessing, how I can remove all numbers?

%Create Co-occurence Network for only class1 and 0 5%
data = dataone.text;
%textdata = data.text;
data = randsample(data,100)
%data=data(1:100,1)
documents = preprocessText(data);
bag = bagOfWords(documents);
bag1 = removeInfrequentWords(bag,2);
counts = bag1.Counts;
cooccurrence = counts.'*counts;
G = graph(cooccurrence,bag1.Vocabulary,'omitselfloops');

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Answer 1

Ergin Sezgin 2022-9-30

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Hello Rachele,

Try using the following code with your string array.

words = ["stringOne", "stringTwo", "2022", "stringThree"]
words = 1×4 string array
    "stringOne"    "stringTwo"    "2022"    "stringThree"
doubleArray = str2double(words)
doubleArray = 1×4
         NaN         NaN        2022         NaN
nanIdx = isnan(doubleArray)
nanIdx = 1×4 logical array
   1   1   0   1
wordsArray = words(1,nanIdx)
wordsArray = 1×3 string array
    "stringOne"    "stringTwo"    "stringThree"

Good luck

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Rachele Franceschini 2022-9-30

Thank you for your suggest, but I am not sure. I corrected my question, maybe the preprocessing function it was not clear. I tried your script, but I have had some problem of error ('The logical indices in position 2 contain a true value outside of the array bounds.') on second-to-last.

Ergin Sezgin 2022-9-30

If the issue is with a char array, its possible to remove all numbers from it, checking each element by an explicit loop or vectorization. If there are multiple char elements in a container, same method should also work after some additional steps are added. Could you please share some of the data?

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