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

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Askeladden2 2021-11-15

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https://ww2.mathworks.cn/matlabcentral/answers/1586999-find-max-values-within-a-defined-range-for-each-column-and-rows-of-a-matrix

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 2021-11-15

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Turn into a timetable and use retime

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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 2021-11-17

编辑：dpb 2021-11-17

在 MATLAB Online 中打开

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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MATLAB Language Fundamentals Matrices and Arrays

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