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How to find longest lasting event

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Attaullah Shafiq
Attaullah Shafiq 2020-5-24
回答： ahmed ibrahim 2021-1-11
How to find longest lasting event?
means i wanna Calculate the duration of each event as the difference between 2 function..
  1 个评论
dpb
dpb 2020-5-24
If use the duration class variable, then it's a simple as subtraction...

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回答（2 个）

Image Analyst
Image Analyst 2020-5-24
What form is your event data in? Is it like a binary vector [0,1,1,1,0,0,0,1,1,1,1,1,1,0,0,0]?
% 1's are in the event and 0's are where the event is not happening.
inEvent = logical([0,1,1,1,0,0,0,1,1,1,1,1,1,0,0,0])
% Extract the longest one and sum up the number of indexes of it.
longestDuration = sum(bwareafilt(inEvent, 1))
inEvent =
1×16 logical array
0 1 1 1 0 0 0 1 1 1 1 1 1 0 0 0
longestDuration =
6
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dpb
dpb 2020-5-24
@IA, groupsummary is relatively recent addition to the splitapply workflow toolkit -- R2018x? I think or thereabouts.
It's another case of essentially the same functionality as a Toolbox function being migrated to base product excepting w/ a different name and slightly different syntax.
Image Analyst
Image Analyst 2020-5-24
Right you are. Cool, thanks. 👍

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ahmed ibrahim
ahmed ibrahim 2021-1-11
What row in the data set does this correspond to (remember that min and max have a 2nd output that gives the row)?

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