0 个投票

Hello,
I am trying to count a group of zeros with a for loop.
But it keeps giving me the error Index must be a positive integer or logical.
Stops=0;
for i=1:size(TachographVehicleSpeed)
if (TachographvehicleSpeed(i)==0&&TachographvehicleSpeed(i-1)~=0)
Stops = Stops + 1;
end
end

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Image Analyst
Image Analyst 2015-5-5

4 个投票

If you want to count groups of zeros, like the number of groups and number of zeros in each group, you can use regionprops() if you have the Image Processing Toolbox.
m = [1 0 0 0 1 1 0 0 1 0 0 0 0]; % Sample data
[labeledArray, numberOfZeroGroups] = bwlabel(m == 0);
stats = regionprops(labeledArray, 'Area');
zerosInEachGroup = [stats.Area]
Results:
numberOfZeroGroups = 3
zerosInEachGroup =
3 2 4

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Thanks ! this works just fine!
Image Analyst
Image Analyst 2015-5-5
You're welcome. If this answers your question best, then maybe you can officially "Accept" the answer and/or vote for it.

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Hooman Habibi
Hooman Habibi 2015-5-5

0 个投票

The index starts from zero so you must start the loop from i=2. you can also count the consecutive zeros in row vector z by the following one liner
numberOfZerosInZ=sum(abs([z 1])+abs([1 z])==0)

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