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How to count the numbers before consecutive negative values?
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Hi, I have a code, whose output is:
c =
0.4855 -0.1902 -0.1758 0.3935 -0.1264 -0.1274 -0.0914 -0.1149 -0.0930 0.5572 0.5098 1.0000
0.9737 0.9508 0.9046 0.9083 0.8997
Now, I want to calculate the maximum number of consecutive negative numbers (in this case, it is, 5) and the number of values before it (in this case, it is 4). How do I do it?
채택된 답변
Image Analyst
2021년 7월 31일
Try this:
mask = bwareafilt(c < 0, 1);
props = regionprops(mask, 'Area', 'PixelIdxList')
longestRun = props.Area % Will be 5
numbersBefore = props.PixelIdxList(1) - 1 % will be 4
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추가 답변 (1개)
Walter Roberson
2021년 7월 31일
c = [
0.4855 -0.1902 -0.1758 0.3935 -0.1264 -0.1274 -0.0914 -0.1149 -0.0930 0.5572 0.5098 1.0000 ...
0.9737 0.9508 0.9046 0.9083 0.8997]
mask = c < 0
starts = strfind([0 mask], [0 1 1])
stops = strfind([mask 0], [1 1 0]) + 1
runlengths = stops - starts + 1
[maxrunlength, idx] = max(runlengths)
num_items_before_run = starts(idx) - 1
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