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Cumulative sum function of daily rainfall

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Saleem Sarwar
Saleem Sarwar 2015-10-1
评论： Walter Roberson 2015-10-1
I have a large daily rainfall data and require to create a new series with rainfall of 1, 2 , 3 and 4 day will be same as observed, then day 5 rainfall will be sum of 1, 2,3, 4 and 5 day rainfall. 6 day rainfall will be sum of rainfall of 2, 3, 4, 5 and 6 day rainfall. Repeat this function for 50 years daily rainfall data. Could any body suggest me matlab script for this kind of analysis? data file will be like this
date rainfall Cumulative rainfall
1/1/1950 10 10
1/2/1950 0 0
1/3/1950 0 0
1/4/1950 0 0
1/5/1950 15 25
1/6/1950 5 20
1/7/1950 10 35
1/8/1950 7 42
.........

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Walter Roberson
Walter Roberson 2015-10-1
conv() the rainfall data with one(1,5)
  2 个评论
Saleem Sarwar
Saleem Sarwar 2015-10-1
编辑：Walter Roberson 2015-10-1
Thanks Walter. This function has not solved my problem fully. The output is like that
Rainfall Cumulative after using Conv function Remarks
37 84 1st three days
41 126 1 to 4 days
6 155 1 to 5 days
42 123 2 to 6 days
29 95 3 to 7 days
5 114 4 to 8 days
I require following output
Rainfall Cumulative after using Conv function Remarks
37 37 1st day
41 41 2nd day
6 6 3rd day
42 126 4 day
29 155 1 to 5 days
5 123 2 to 6 days
Thanks
Walter Roberson
Walter Roberson 2015-10-1
If you let the rainfall be stored in the column vector r, then
cr = cumsum([0;r]);
col2 = [r(1:4);ss(6:end)-ss(1:end-5)];
[r,col2]
Or
col2 = [r(1:4); conv(r, ones(1,5), 'valid')]; %one step
[r,col2]

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