First column matrix into ones

2 次查看（过去 30 天）
Y LIN
Y LIN 2022-3-5
评论： Y LIN 2022-3-5
Hello! How to extract the first coulmn of the matrix and make it ones?
For exmaple:
X = [1 4; 2 2; 3 6];
y = ones(X(:,1));
but it seems not work.
Thanks advanced for your help!
  2 个评论
Walter Roberson
Walter Roberson 2022-3-5
Okay, X(:,1) would be [1;2;3] .
Now what do you mean by "make it ones" ? Are you asking for a vector of ones with the same number of entries as there are rows in the table? Are you asking that afterwards X would be
1 4
1 2
1 6
??
Y LIN
Y LIN 2022-3-5
Hello! Thanks for your reply. I'd like to extract only first column of the matrix, like example 3x2 into 3x1 and then make it all value as 1. How can I do that?

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Torsten
Torsten 2022-3-5
编辑：Torsten 2022-3-5
X = [1 4; 2 2; 3 6];
X(:,1) = 1
or
y = ones(size(X,1),1)
depending on how your question is meant.
  2 个评论
Y LIN
Y LIN 2022-3-5
Hello! Thanks for your reply. I'd like to extract only first column of the matrix. Like example 3x2 extract 3x1 and then make all value as 1. How can I do that?
Y LIN
Y LIN 2022-3-5
Oh, sorry for late refreshing the page! It works! Thank you so much for your help!

请先登录，再进行评论。

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