How does the matlab for loop work on a column vs. row vector of strings?

Question

Frederick Breidt 2022-11-2

0
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此问题的直接链接

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评论： Frederick Breidt 2022-11-2

displaying a vector of strings using a for loop gives different results with a column vector vs. a row vector, why is that?

words = ["this"; "is"; "text"]
words = 3×1 string array
    "this"
    "is"
    "text"
for word = words
    disp(word);
end
    "this"
    "is"
    "text"
for word = words'
    disp(word);
end
this
is
text

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Answer 1

Voss 2022-11-2

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https://ww2.mathworks.cn/matlabcentral/answers/1841963-how-does-the-matlab-for-loop-work-on-a-column-vs-row-vector-of-strings#answer_1089818

在 MATLAB Online 中打开

for iterates over columns, so if you give it a column vector, it iterates one time, with the loop variable taking the value of the whole column.

for col = eye(3)
    disp(col)
end
     1
     0
     0

     0
     1
     0

     0
     0
     1

Why? Because the powers that be decided that's how it should work.

From the documentation:

To iterate over the values of a single column vector, first transpose it to create a row vector.

https://www.mathworks.com/help/matlab/ref/for.html

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Frederick Breidt 2022-11-2

Thank you for the answer. I had read the for loop info incorrectly, not realizing it iterated with whole columns instead of iterating through the column. That could actually be useful!

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