How to sum every 29 data and make some condition for them?

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I have data for a long time. I would sum them every 30 times continuously (first row to 30th row, then second row to 31th row and 3th row to 32 and ............... to end). finally, I would do some conditions. I attached an excel file to show clearly what is that. I would have it by codes in matlab. is there any way to do that?

Accepted Answer

Guillaume
Guillaume on 19 Jul 2016
For your moving sum, use movsum (available since r2016a, before that use a convolution). You can then test all values at once with vectorised comparison:
rainfall = readtable('sample.xlsx', 'Range', 'A1:B43082');
movingsum = movsum(rainfall.Rainfall_mm_, 30, 'EndPoints', 'discard');
%prior to 2016a:
%movingsum = conv(rainfall.Rainfall_mm_, ones(30, 1), 'valid');
condition1 = movingsum > 0.5;
condition2 = condition1(1:end-1) & ~condition1(2:end);
  1 Comment
Milad
Milad on 22 Jul 2016
Edited: Milad on 22 Jul 2016
Thanks, is work well. NOTE: the condition 2 should be
condition2 = condition1(2:end) & ~condition1(1:end-1) this codes are helpful for those who wants to work with rainfall events, and not too much familiar in matlab. finally, the events can be extracted handy in excel. in this codes, 30 is interevent time, and 0.5 in minimum depth.

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More Answers (1)

Alexandra
Alexandra on 19 Jul 2016
Edited: Alexandra on 19 Jul 2016
I would try something like this:
for k=1:(numel(A)-30)
B(k) = sum(A(k:k+29));
if B(k) <= 0.5
C(k) = 0;
else
C(k) = 1;
end
if k == 1
D(k) = 0;
else
if C(k) == 1 && C(k-1) == 0
D(k) = 1;
else
D(k) = 0;
end
end
end
Does it work?

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