MATLAB: Extract certain rows from matrix

data processing

Hello,

I have extracted the peak data from a 1×86400 matrix in the workspace (named a) using the following command:

[pks,locs]=findpeaks(a)

This results in 'pks' = 1×14382 and the 'locs' positions for the obtained data (Also sized at 1×14382).

I would like to use the locations (locs) from the above to extract data from another 1×86400 data file (in this case named b).

Whats the best approach to do this?

Best Answer

Assuming you read the other data file into another_matrix, the answer is

extracted_data = another_matrix(loc);

I suggest you read about Matrix indexing in MATLAB.

Related Solutions

MATLAB: How do i find the matching data for locs when using findpeaks()

If your peaks plot is produced by

plot(time, data)

and you're locating the peaks with

[pks,locs]=findpeaks(data);

Then, to plot the peaks as a function of time,

plot(time(locs), pks, '*')

MATLAB: How to record 2 peak values pass a specific number on the X axis

I understand that you want to record the peaks past 300. In that case you could limit your data to values past 300. For example if data is stored in variable called ‘data’, you could use something like:

[pks,locs] = findpeaks(data(300:end))

Where the 'pks' variable would contain your y1 and y2 values and 'locs' would have x1 and x2, which would record the max values of only two peaks.

Best Answer

Related Solutions

MATLAB: How do i find the matching data for locs when using findpeaks()

MATLAB: How to record 2 peak values pass a specific number on the X axis

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