Splitting a cell array of multi-word strings into a cell array of single-word strings

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Illan Kramer 2020-2-3

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https://ww2.mathworks.cn/matlabcentral/answers/503402-splitting-a-cell-array-of-multi-word-strings-into-a-cell-array-of-single-word-strings

评论： Illan Kramer 2020-2-3

I have a cell array of multi-word strings that is very long (many tens of thousands of cells) that I want to split into a cell array of single-word strings. Is there a way to do this without combining the split function and a for loop?

Currently, I am doing the following:

CellStrings = {'Here is my First String';'Now a second string';'And here is a third'}

SingleColumnStrings = {};

for i = 1:length(CellStrings)

temp = split(CellStrings(i));

SingleColumnStrings = [SingleColumnStrings; temp];

clear temp

end

clear i

When CellStrings gets large, this for loop takes forever. Is there a way to do this as a matrix/vector operation?

Thanks in advance.

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Guillaume 2020-2-3

Note that clear is rarely needed. clear inside a loop is a particularly bad idea and will slow the loop for no useful purpose.

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Answer 1

fred ssemwogerere 2020-2-3

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I think this can do nicely:

SingleColumnStrings=cellstr(strsplit(strjoin(string({'Here is my First String';'Now a second string';'And here is a third'})'))')

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Illan Kramer 2020-2-3

编辑：Illan Kramer 2020-2-3

That's perfect! My tic/toc runtime now for that operation has gone from over 50s to about 0.25s. Thanks so much! I actually just put the transpose on the outside of the entire right side of the equal sign instead of having 2 of them in there and it worked just as well.

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Answer 2

Guillaume 2020-2-3

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https://ww2.mathworks.cn/matlabcentral/answers/503402-splitting-a-cell-array-of-multi-word-strings-into-a-cell-array-of-single-word-strings#answer_413556

编辑：Guillaume 2020-2-3

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Possiblty more efficient than the accepted answer since it doesn't require concatenating strings to then split them again:

SingleColumnStrings = regexp(CellStrings, '\S+', 'match');
SingleColumnStrings =[SingleColumnStrings{:}].';

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Stephen23 2020-2-3

+1 definitely the way to go.

Illan Kramer 2020-2-3

This is also a great solution, thanks! Comparing tic/toc runtimes, this one is 0.01s faster than the accepted answer. I will luxuriate in all of my new spare time upon deploying this solution going forward.

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