清空筛选条件
清空筛选条件

Random pick data by label

2 次查看（过去 30 天）
Hg
Hg 2015-8-7
编辑： Azzi Abdelmalek 2015-8-7
I have a data array (13x5). The last column is the class (1-4) of each data. How do I randomly pick n-number of data from each class? Let say 2 data from each class.

请先登录，再回答此问题。

采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2015-8-7
编辑：Azzi Abdelmalek 2015-8-7
A=[randi(9,100,4) randi([1 4],100,1)] % Example
[ii,jj,kk]=unique(A(:,5))
m=accumarray(kk,(1:numel(kk))',[],@(x) {x'})
out=cell2mat(cellfun(@(x) A(x(randperm(numel(x),2)),:),m,'un',0))

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

产品

Community Treasure Hunt

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

Start Hunting!

Translated by