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

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Milad 2016 年 7 月 18 日

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?

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### 採用された回答

Guillaume 2016 年 7 月 19 日
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:
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);
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Milad 2016 年 7 月 22 日

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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### その他の回答 (1 件)

Alexandra 2016 年 7 月 19 日

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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