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

DM
2015 4 27
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pfb
pfb 2015-4-27
编辑：pfb 2015-4-27

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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
thanks, By array you mean a matrix right?
pfb
pfb 2015-4-27
编辑：pfb 2015-4-27
yes.
Note that u' and transpose(u) have different effects for complex numbers.
DM
DM 2015-4-27
I have also come across the following notation x(:)? Do you know what it means?

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