I have matrix A, how can I add a row in matrix A with others rows of matrix A ?

2 次查看（过去 30 天）
Firzi Mukhri
Firzi Mukhri 2013-5-29
I have matrix A, how can I add a row in matrix A with others rows of matrix A ?
For example:
a = ones (220,220);
b = a(:,1)+a(:,11)+a(:,21)+ a(:,31)+a(:,41)+a(:,51)+a(:,61)+a(:,71)+a(:,81)+a(:,91);
I would like to obtain sum of row as b. The problem is the matrix I'm working on is thousands, is there a more easy way to do this? a certain function maybe that only needs me to specify the column number. Thank you!

请先登录，再回答此问题。

采纳的回答

Matt Kindig
Matt Kindig 2013-5-29
b = sum(a(:,1:10:91),2)
  2 个评论
Matt Kindig
Matt Kindig 2013-5-29
2 is the dimension over which the summing is performed. Dimensions are ordered in the same order that they are returned from the size() function, i.e. dimension=1 is sum down the rows, dimension=2 is sum down the columns, dimension=3 is sum across dimension 3 ("planes"), etc.

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 Resizing and Reshaping 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