sum of consecutive events below a threshold

M = [-2,1,4,-1,-3,-4,3, 3, 1,-2, -3,-1,-3,]

I have an array like M above, I want to find where consecutive numbers are less than -1, and find their mean as well as count:

In this case my first event will be np.mean (-1,-3,-4) and count will be 3 and second will be np.mean (-2,-3,-2,-3) then count will be 4

Thanks in advance

[dpb]

Either M is mistyped or the second result is wrong...I suppose you meant

M = [-2,1,4,-1,-3,-4,3, 3, 1,-2,-3,-2,-3,]

not

M = [-2,1,4,-1,-3,-4,3, 3, 1,-2, -3,-1,-3,]

as given?

How is this Q? any different than the one you posted just 20 min or so earlier at https://www.mathworks.com/matlabcentral/answers/460360-finding-the-mean-sum-of-consecutive-dry-days-below-1

Remove one or the other; don't post multiple times for the same question if somebody doesn't answer instantaneously.

[Mustapha Adamu]

Thw other one removed, thanks and was mistyped in the first case

Answer 1

[Image Analyst]

If you have the Image Processing Toolbox, try this:

M = [-2,1,4,-1,-3,-4,3, 3, 1,-2, -3,-1,-3,]
binaryM = M <= -1 % Find locations where M <= -1
props = regionprops(binaryM, 'Area') % Make the counts
counts = [props.Area] % Concatenate all from structure into array.
% Get rid of single counts, where counts == 1
% like when M was = to -2 at the beginning.
counts(counts == 1) = []

Result is

counts =
     3     4

[Mustapha Adamu]

I dont have Image processing toolbox unfortunatly is I will try to get Image processing toolbox, but in the mean time is there another way?

[Mustapha Adamu]

Hi I got the image processing tool box and now its working fine, Another question that I have though is that how if I want to do this in a loop say from 1-60, from 2-61, from 3-62 etc etc