# Count number of words per row in a string

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Angelavtc 2022 年 4 月 21 日

Say I have the following text:
str = [
"an example of a short sentence"
"a second short sentence"]
I would like to count the total number of words per row.
In this case, I want matlab to tell me: 6, 4
I have tried the "count" command, but it is only meant to find specific words.

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### 採用された回答

Image Analyst 2022 年 4 月 21 日
Try this:
str = [...
"an example of a short sentence" ;
"a second short sentence"]
counts = zeros(size(str));
for row = 1 : length(str)
counts(row) = length(strsplit(str(row)));
end

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### その他の回答 (2 件)

Voss 2022 年 4 月 21 日
I won't claim that this is the best way to do it, or that it'll work for anything you want to consider a "word" in your string array, but here's something:
str = [
"an example of a short sentence"
"a second short sentence"];
arrayfun(@(x)numel(strsplit(x)),str)
ans = 2×1
6 4
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Les Beckham 2022 年 4 月 21 日

In 2020b or later you can also use a pattern with a regex pattern to find (and count) words. It took some experimenting to get this right but it works.
str = [
"an example of a short sentence"
"a second short sentence"];
count(str, regexpPattern('\w*'))
ans = 2×1
6 4
If you don't want to allow underscores and numbers in your "words", use this. This allows one optional capital letter only at the beginning of the words.
count(str, regexpPattern('[A-Z]?[a-z]*'))
ans = 2×1
6 4

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