Cumulative sum function of daily rainfall
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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
2015-10-1
conv() the rainfall data with one(1,5)
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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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