Conditional Skip in for loop

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,

Answer 1

[Matt J]

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

[Sarah Aimen]

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]

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]

Sarah's comment relocated here

Perfect! Works very well!

Thank you very much, Matt!

[Matt J]

You're welcome. Please Accept-click the answer, though, to certify that we solved it.

Answer 2

[Image Analyst]

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)