how to separate a matrix according to class labels?

2 次查看（过去 30 天）
Ararat Cetinkaya
Ararat Cetinkaya 2020-3-7
回答： Guillaume 2020-3-7
Hi everybody,
I have a matrix with size of 1500x3. Third column of the this matrix contains the class labes as a numeric like 3,2,1 and size of the each classes is uncertain. I want to divide the main matrix into three different matrices according to these three different classes. Only elements from class 1 will be taken in the first matrix, Only elements from class 2 will be taken in the second matrix, Only elements from class 3 will be taken in the third matrix.

请先登录，再回答此问题。

回答（1 个）

Guillaume
Guillaume 2020-3-7
classmatrices = splitapply(@(rows) {yourmatrix(rows, :)}, (1:size(yourmatrix, 1)'), yourmatrix(:, 3))
is one way. Note that in matlab it's rarely useful to do this splitting. It's often easier to work on the whole 1500x3 matrix and use aggregation functions such as groupsummary.

类别

在 Help Center 和 File Exchange 中查找有关 Get Started with MATLAB 的更多信息

标签

产品

Community Treasure Hunt

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

Start Hunting!

Translated by