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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