Why does length sometimes read the number of columns instead of the number of rows?

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Yasmin Samy
Yasmin Samy 2017-8-10
评论： Chad Greene 2017-8-10
Hello, I`m looping over the length of a table (converted to array to be 'double'). However, sometimes the length reads the rows and when run again sometimes it reads columns! Why is this happening? Thanks

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Chad Greene
Chad Greene 2017-8-10
编辑：Chad Greene 2017-8-10
length just tells you the longest dimension. If you're talking about a table (the piece of furniture), its length is always its longest dimension. To get just the number of rows or columns, do
rows = size(X,1);
or
cols = size(X,2);

更多回答（2 个）

Jan
Jan 2017-8-10
Whenever you have a question concerning a command, start at the documentation:
doc length
or https://www.mathworks.com/help/matlab/ref/length.html
There you find these 2 initial lines:
length
Length of largest array dimension
Sounds clear :-)
Yasmin Samy
Yasmin Samy 2017-8-10
thanks all!

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