Peak detection without using findpeaks()

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preeti visweswaran 2017-4-18

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/336003-peak-detection-without-using-findpeaks

编辑： preeti visweswaran 2017-4-19

forRef_2.xls

Following is the code to find peaks.What input should be given to run the function along with threshold.I tried giving both file and the col as inputs,but fail to detect peaks.I gave 0.75 as the threshold.Attached is the data I am working with. There is something else going on with logic,please help!

file = 'forRef_2.xls';
col = xlsread(file,'J:J');
function [peaks, locations] = peakdet (mag, threshold)
len = length(mag);
prev = 1;
cur = 2;
next = 3;
k = 1; %number of peaks
while next < len
    if mag(cur) - mag(prev) > threshold
        if mag(cur) > mag(next)
            peaks(k) = mag(cur);
            fprintf('peak at %d has magnitude %d\n', cur,mag(cur));
            k = k + 1;
        end
    end
    prev = cur;
    cur = next;
    next = next + 1;
end
end