Aggregating numbers based on first column index
显示 更早的评论
Hi
I have a matrix as follows
x=[1 3;
1 4;
1 6;
2 5;
2 7;
3 4;
3 11;
3 1;
3 2]
I want to write a code or a loop that aggregates the numbers in the second column for each different number in the first column.
The result should be
y= [1 13;
2 12;
3 18]
采纳的回答
Walter Roberson
2016-11-4
[unique_keys, ~, uq_idx] = unique(x(:,1));
totaled_data = accumarray(uq_idx, x(:,2));
y = [unique_keys, totaled_data];
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Matrix Indexing 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
