MATLAB: Hello question to iterate over elements of a column

for loopiterationmatrix

I have a CSV file, I have imported the file and have to do operations on one particular column and find the first nonzero element and the corresponding time stamp from another column. However, when I try to iterate over the required column it directly points to the last non-zero element. I do not understand the mistake in my code. Kindly help me understand the mistake. Any help appreciated. Thanks in advance.
 for i = 1:1:length(zRPM)
    curzRPM = zRPM(i);
    if zRPM(i) ~= 0
        boutstart = zRPM(i);
        starttime = timestamp(i);
%         for j = 1:1:length(zRPM)
%             if zRPM(j) == 0
%                 endtime = timestamp(j-1);
%             end
%         end
    end
output:
 8.8772 <---- This is the last non-zero element in the column and its
corresponding timestamp
    '09-07-2017 16:00'

Best Answer

Break out of the loop when you find that first non-zero value:
    if zRPM(i) ~= 0
        boutstart = zRPM(i);
        starttime = timestamp(i);
        break;  % <-- ADDED THIS
    end
You could also use the "find" function for this and avoid the loop.
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