I don't understand what this u(:,1) does to matrix or vector?

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DM
DM 2015-4-27
评论： Stephen23 2015-4-28
Hi
What does the following notation mean
u(:,1)
Does it covert a row vector to a column vector?
Thanks

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pfb
pfb 2015-4-27
编辑：pfb 2015-4-27
It gives you the first column of the array u.
If u is a row vector, that is the 1st element.
if u is a column vector, that is the entire vector.
If you want to transform a row vector into a column, see u', transpose(u), or u(:).
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DM
DM 2015-4-27
I have also come across the following notation x(:)? Do you know what it means?

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