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

DM
2015 4 27
1 个回答
回答已采纳
更新时间：2015 4 28
18 次查看（30 天）

 采纳的回答

pfb
pfb 2015-4-27
编辑：pfb 2015-4-27

0 个投票

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(:).

4 个评论
显示 2更早的评论 隐藏 2更早的评论

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?

请先登录，再进行评论。

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 Creating and Concatenating Matrices 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by