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select a row in a matrix based on jump in value

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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
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Sriram Tadavarty
Sriram Tadavarty on 24 Mar 2020
Just to get the clarification, you wanted the rows in which third column is alive?

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Accepted Answer

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

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