Making part of a column negative depending on another column

1 次查看（过去 30 天）
Christopher
Christopher 2013-9-10
Hello,
I am trying to do the following. I have two column vectors as follows:
a=[3;5;8;2;-2;-5;-8];
b=[1;2;3;4;5;6;7];
I am trying to make the values of b corresponding to the locations of a negative in a, negative. so the result would be
b_new=[1;2;3;4;-5;-6;-7]
The last three values of b would be changed to negative because the last three values of a are negative. Both column vectors are the same length.

请先登录，再回答此问题。

采纳的回答

Jeff E
Jeff E 2013-9-10
b_new = sign(a) .* b

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Logical 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