清空筛选条件
清空筛选条件

How to make array with first values of matrix

2 次查看（过去 30 天）
Filip Konecny
Filip Konecny 2018-2-22
评论： Jan 2018-2-22
Hello to all,
I have a matrix for example like this: [1 2 3 4 5 6 7 8 9 10;2 2 3 3 4 5 5 2 3 3]' the first column represents time, the second ID of time. I need to make a cycle which goes through the matrix and takes the first time value from the group of ID of time.
So in this case the result will be: [1 3 5 6 8 9].
unique function is unfortunately not helpful in this case because the groups of ID of time might repeat.
Thank you very much
Filip

请先登录，再回答此问题。

回答（1 个）

C.J. Harris
C.J. Harris 2018-2-22
% Input
A = [1 2 3 4 5 6 7 8 9 10;2 2 3 3 4 5 5 2 3 3]';
% Result
B = A([boolean(1); diff(A(:,2))~=0],1);

类别

在 Help Center 和 File Exchange 中查找有关 Calculus 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