Calling characters from character arrays

Question

Gokhan Kayan 2018-1-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/378334-calling-characters-from-character-arrays

评论： Gokhan Kayan 2018-1-22

I have an charecter array that contains so many characters and I want to call 4 th character from each row. How can I do it ?

For example consider that I have 6x1 character matrix like

Adana 
mersin
hatay
iskenderun
cemre
cebir

I want to call 4 th character of each row and form a new 6x1 matrix with them like

n
s
a
e
r
i

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Guillaume 2018-1-22

What you have is either

a 6x1 cell array, where each cell is a 1xN char array
a 6x1 string array (only in R2016b or later)

This is definitively not a 6x1 character array, which by definition, would have 6 letters vertically and only one letter horizontally.

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Answer 1

Birdman 2018-1-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/378334-calling-characters-from-character-arrays#answer_301173

编辑：Birdman 2018-1-22

在 MATLAB Online 中打开

str='adana mersin hatay iskenderun cemre cebir';
str=regexp(str,'[a-z]*','match');
for i=1:numel(str)
    a{i}=str{i}(4);
end

or instead of for loop:

cellfun(@(x) x(4),str)

EDIT:

After Guillaume's warning, different and easier approach for constructing the demo data and solution:

str='adana mersin hatay iskenderun cemre cebir';
str=strsplit(str,' ');
cellfun(@(x) x(4),str)

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Birdman 2018-1-22

Yes, I understood what you mean about it. Thanks.

Gokhan Kayan 2018-1-22

Thank you so much :)

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Answer 2

Walter Roberson 2018-1-22

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/378334-calling-characters-from-character-arrays#answer_301174

"For example consider that I have 6x1 character matrix like"

No, a 6 x 1 character matrix cannot have multiple characters in the same row. You might have a 6 x 1 string matrix, or you might have a 6 x 1 cell array of characters.

If you have 6 x 10 (or wider) character array A, then A(:,4)

If you have a 6 x 1 cell array of characters or a 6 x 1 string array A then one of the approaches is cellfun(@(S) S(4), A) . In the case of string arrays, another approach is extractBetween(A, 4, 4) {with no loop} -- but note that this would return a 6 x 1 string array with each string being a single character long, so if you wanted the results as 6 x 1 char then you would need to char() the result of the extractBetween()