extracting submatrices from cell

Question

Daniel 2013-4-27

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/73752-extracting-submatrices-from-cell

采纳的回答： Ahmed A. Selman

Consider the following bit of code:

X={1, 'a'; 'b', 3.14};

X(2,:)

X{2,:}

It produces the following output:

ans = 'b' [3.1400]

ans = b

ans = 3.1400

Can anyone explain to me the reason for the difference. I would have expected the statement X(2,:) to fail and that X{2,:} would have produced what X(2,:) did, in fact, produce.

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Answer 1

Ahmed A. Selman 2013-4-27

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https://ww2.mathworks.cn/matlabcentral/answers/73752-extracting-submatrices-from-cell#answer_83647

在 MATLAB Online 中打开

Try the same example with:

X={1, 'a'; 'b', 3.14};
K1=X(2,:)
[K21 K22]=X{2,:}

Then use

whos

to see that K1 is a cell, i.e., it only puts part from X into K1, while [K21 K22] is [char double], extracting the contents of the cell into a matrix. The first operation (K1) is another way for cell concatenation.