select a row in a matrix based on jump in value

3 次查看（过去 30 天）
Atique Malik
Atique Malik 2020-3-24
评论： Ameer Hamza 2020-3-25
I have a matrix of data. 9 columns and 5000 rows. The columns represent time series data.
The third column is a variable that comes alive asynchronously. It is an output from a variable that is sampled less frequently than all the others.
I want to keep only those complete rows where this variable changes value.
In practice, the slowly sampled variable is a lab analyser which keeps outputting analogue concentration values which change infrequently. The other variables are temperature readings from an experiment.
Thanks for the help

请先登录，再回答此问题。

采纳的回答

Ameer Hamza
Ameer Hamza 2020-3-24
Try this. Here M is your 5000*9 matrix
idx = [true; diff(M(:,3)) ~=0];
M = M(idx, :);

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