Consolidating counts & sum by Year Range

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Muhammad Rahil Rafiq
回答： ME 2020-1-15
A=[2001 2002 2001 2003 2003 2003 2004 2004 2004 2004 2004 2007;
1 2 3 4 5 6 7 8 9 12 11 12]
I need to know the sum of toys between 2001-2003, 2002-2004, 2005-2007.

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2020-1-15
y = [2001, 2002, 2005
2003, 2004, 2007];
A = [2001 2002 2001 2003 2003 2003 2004 2004 2004 2004 2004 2007;
1 2 3 4 5 6 7 8 9 12 11 12]';
lo = A(:,1) >= y(1,:) & A(:,1) <= y(2,:);
i = lo.*(1:3);
data = A(:,2).*lo;
out = [y;accumarray(i(lo),data(lo))'];

更多回答（2 个）

Jakob B. Nielsen
Jakob B. Nielsen 2020-1-15
Well, if the 2nd row is your toy counts, something like:
indexes=find((2002 <= A(1,:)) & (A(1,:) <= 2004)); %finds the column indexes which is greater than or equal to 2002, but smaller than or equal to 2004 (ie, the 2002-2004 range)
sum(A(2,indexes)); %gives you the sum of the 2nd row entries from the columns that satisfy the above conditions only.
Is this along the likes of what you need?
ME
ME 2020-1-15
If you wanted to get an array containing the sums for all of your defined ranges then you could begin with
R = [2001 2003;
2002 2004;
2005 2007];
where each row contains the year to sum from and year to sum until. Then you can use the below to get an array with one sum for each of the ranges defined in R.
[rows,~]=size(R);
for i=1:rows
ii = A(1,:) >= R(i,1) & A(1,:) <= R(i,2);
ii = find(ii == 1);
RangeSum(i) = sum(A(2,ii));
end

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