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

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What does the following notation mean
Does it covert a row vector to a column vector?

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pfb il 27 Apr 2015
Modificato: pfb il 27 Apr 2015
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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