How to change a sign of elements in a matrix for each coulmn separatly ?

1 次查看（过去 30 天）

显示更早的评论

HAAAAH 2019-1-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/441878-how-to-change-a-sign-of-elements-in-a-matrix-for-each-coulmn-separatly

回答： Adam 2019-1-28

采纳的回答： Adam

I want to change

v = [-2 3 0.5 4 22 15 -19 -0.01 104 78]

vny = [-2 -3 0.5 -4 22 -15 -19 0.01 104 -78]

thanks for tips

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Adam 2019-1-28

编辑：Adam 2019-1-28

What is the logic behind which columns you want to change? Just every other column? If there is none then obviously you will have to do it manually (or at least create a multiplier array manually).

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Adam 2019-1-28

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/441878-how-to-change-a-sign-of-elements-in-a-matrix-for-each-coulmn-separatly#answer_358318

在 MATLAB Online 中打开

vny = v;
vny( 2:2:end) = -vny( 2:2:end);

should work

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

类别

MATLAB Language Fundamentals Matrices and Arrays Matrix Indexing

在 Help Center 和 File Exchange 中查找有关 Matrix Indexing 的更多信息

Community Treasure Hunt

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

Start Hunting!

Translated by