Do I need to use repmat to plot the RMS at every point in a signal?

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Win
Win 2014-2-18
评论： Win 2014-2-18
Can you please tell me how to plot the RMS at every point in the signal. I think I might need to use the repmat function to do it but I'm not sure.
clear all;
Array=csvread('Pencilbreak-63dB.csv');
col1 = Array(:, 1);
col2 = Array(:, 2);
plot(col1, col2)
end
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dpb
dpb 2014-2-18
The file is of little help/interest...as we're telling you, you'll have to choose a sampling window based on the response time of your system you need.
There are several (actually a veritable plethora) of submissions on File Exchange--do a search for "moving rms".
Win
Win 2014-2-18
Thanks for your reply. I'm sorry about the duplicate thread. I just wanted to phrase the question in a better way. Thanks for the help.

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回答（1 个）

Chad Greene
Chad Greene 2014-2-18
The rms of a single point is not terribly interesting. There are many ways to do what you're trying to do, but you could take a "moving rms", which would be the rms of a small segment of the signal. To center a 101-point rms of your signal (below call it signal ) about point n, you could do
signalrms = NaN(size(signal)); % preallocates the array
for n = 51:length(signal)-51
signalrms(n) = rms(signal(n-50:n+50));
end
  2 个评论
Win
Win 2014-2-18
Thanks for your code but I don't know how to apply it in my case as my signal is in the form of 2 columns of data. This is the code I have so far to read and plot the data from the csv file:
clear all;
Array=csvread('Pencilbreak-63dB.csv');
col1 = Array(:, 1);
col2 = Array(:, 2);
plot(col1, col2)
end
Chad Greene
Chad Greene 2014-2-18
Yes, we can assume column 1 represents time and column 2 is your signal. In the code above, indices of each value are given by n. That's about as much as I can tell you without actually doing your homework for you.

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