Conditional Skip in for loop

2019 7 10
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回答已采纳
更新时间：2019 7 10
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Hello,
I have a data array like:
x = [0, 0, 45, 43, 42, 41, 0 , 0 , 0, 0, 45, 43, 42, 41 ];
In my data points, 2 times my data became non-zero. Which I call them an "event".
I want my code to calculates the number of events as "2".
and calculate the sume of numbers at each event.
I'd appreciate your help at this matter.
Thanks,

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Matt J
Matt J 2019-7-10
编辑：Matt J 2019-7-10

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Apply the suggestions in this thread to A=logical(x)+1.

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Sarah Aimen
Sarah Aimen 2019-7-10
Thanks Matt for your prompt response! Actually my problem is much more complicated than this.I just simplified it. I attached a screenshot of my actual data.
I wrote this code,
x = [1, 2, 45, 43, 42, 41, 6 , 2, 7];
for i = 1 : length(x);
if x(i) > 10;
i
end
i = i + 4;
end
I want my code to sweep data, as soon as it saw a data greater than 10, print it and skip 4 points after it, then continue sweeping to find the next point greater than 10.
Ideal answer: 45
What this code gives: 45, 43, 42, 41
Matt J
Matt J 2019-7-10
Just use a while loop, then:
x = [1, 2, 45, 43, 42, 41, 6 , 2, 7];
i=0;
while i<length(x)
i=i+1;
if x(i) > 10;
x(i)
i = i + 3;
end
end
Matt J
Matt J 2019-7-10
Sarah's comment relocated here
Perfect! Works very well!
Thank you very much, Matt!
Matt J
Matt J 2019-7-10
You're welcome. Please Accept-click the answer, though, to certify that we solved it.

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更多回答（1 个）

Image Analyst
Image Analyst 2019-7-10

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Try this (requires the Image Processing Toolbox, which you probably already have):
x = [0, 0, 45, 43, 42, 41, 0 , 0 , 0, 0, 45, 43, 42, 41 ];
% Count number of non-zero regions: (requires Image Processing Toolbox)
[~, numNonZeroRegions] = bwlabel(x)
% Compute sum of values
props = regionprops(x>0, x, 'PixelValues');
sumOfValues = sum(vertcat(props.PixelValues), 2)

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