Find max values within a defined range for each column and rows of a matrix

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Askeladden2
Askeladden2 2021-11-15
编辑： dpb 2021-11-17
Hi!
I have a 20x305471 matrix, representing 20 variables in a time series sampled at 28.28 Hz. I have also have a time vector (1x305471) = [0, 0.0354, …. And up to 10800];
I want to extract maximum values using different time ranges. E.g. I want to find the maximum values from 0 to 40 min, 40 to 120min.. up to 160 to 180min.
Any help is very appreciated! Thanks

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dpb
dpb 2021-11-15
Turn into a timetable and use retime
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Askeladden2
Askeladden2 2021-11-17
I need to convert them back into an array because I am using the values for creating probability distributions and etc.
dpb
dpb 2021-11-17
编辑：dpb 2021-11-17
Just reference the desired variables directly from the table/timetable -- no need to create separate, duplicates as arrays.
See the section on the table data class on how to reference into a table for the myriad of available addressing syntaxes. To return just a variable, the "dot" notation is painless and efficient...
ttMyTT=table2timetable(readtable('myfile.ext'));
plot(ttMyTT.time,ttMyTT.VarX)
No auxiliary arrays in sight/needed...use your own variable names in the data file, of course.

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