Fit a signal into smaller window while maintaiing proportion

Question

John 2013-3-16

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https://ww2.mathworks.cn/matlabcentral/answers/67403-fit-a-signal-into-smaller-window-while-maintaiing-proportion

I have a random signal of 2048 points. There are several peaks spread out (maybe 10). The rest are all zeros or have very low amplitude.

I want to squeeze this signal into a 512 signal window maintaining all the peaks and data with less of the zeros or low amplitude data.

How can I do this in Matlab?

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Answer 1

Image Analyst 2013-3-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/67403-fit-a-signal-into-smaller-window-while-maintaiing-proportion#answer_78827

在 MATLAB Online 中打开

You can sort and then keep just the 512 with the highest values:

data = rand(1, 2048);
subplot(2, 1, 1);
plot(data);
% Sort the data
[sortedData, sortIndices] = sort(data, 'descend');
% Find the first 512 - they will be the greatest value.
elementsToKeep = sortIndices(1:512);
% Get them back in their original order:
elementsToKeep = sort(elementsToKeep);
% Extract those elements
extractedData = data(elementsToKeep);
subplot(2, 1, 2);
plot(extractedData);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);