Peak detection without using findpeaks()

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

[Jan]

I've formatted the code. Please read https://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup#answer_18099 to do this by your own in the future.

What is your question?

[preeti visweswaran]

I am unable to see the code

[preeti visweswaran]

My question is how do i find peaks using the function peakdet in code.I want to have the file,and threshold as input

[KSSV]

There are seven columns in the file...you want to find the peaks for each column? And what is threshold?

[preeti visweswaran]

the threshold is 0.75 and on the last column Mean_Acc

[KSSV]

So you want to find the maximum value which is less then the threshold from the column?

[preeti visweswaran]

I want to detect all the Mean_Acc values that are above the 0.75