清空筛选条件
清空筛选条件

How do I add a column to a matrix with specific values?

1 次查看（过去 30 天）
Z
Z 2013-7-8
If I have a matrix like so:
1 2 3 4
5 2 6 7
3 6 5 7
How can I add a third column with a value of one for every row that has a value of 2 in the second column? Thanks!

请先登录，再回答此问题。

采纳的回答

Z
Z 2013-7-8
Never mind, I found out that this is the syntax:
mydata (mydata (:,2) == 2,4) = 1;

更多回答（1 个）

Greg Heath
Greg Heath 2013-7-10
The question is ill posed.
The matrix has 4 columns and the question is how to add a third column.
The accepted answer is incorrect.
It replaces components in the fourth column
1. Bad question
2. Bad answer.
It should be flagged.

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