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Assigning indexes in an array and finding max values in a selected range

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FW
FW 2019-4-26
评论： Walter Roberson 2019-4-26
If we have X = time series data and signal in a 8000x 2 array (Matlab 2017b). The first column is time and the second column is signal of light absorbance. How can we find a maximum value in the selected range say from row 4000:5000 of the second column? Additionally, I would to like generate another column within X containing the index of each entry so that it becomes 8000x3 array. Thanks.

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Walter Roberson
Walter Roberson 2019-4-26
Assuming that X is a timeseries object (and not a Simulink time series):
rstart = 4000; rend = 5000;
[maxabs, maxidx] = max(X.Data(rstart:rend,2));
maxloc = rstart + maxidx - 1;
data_there = X.Data(maxloc,:);
It is not clear to me what the third column would be an index of?
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