在另一列中添加具有特定条件的一列，例如excel的求和 [英] addition of one column with certain condition in another colum, like sumifs of excel

问题描述

我有一个像这样的矩阵

A=[ 1 2; 2 3; 3 4; 4 5; 5 6; 6 8; 7 9; 8 5; 9 4]

现在，我想添加第二列，条件是如果limit = 0，interval = 3和limit = limit + interval，或者换句话说，当第1列的值的范围如下时，我必须对第2列求和0到3、3到6、6到9和9到12，我想要第2列的对应值之和.

Now I want to add a second column the condition is that if limit=0, and interval=3 and limit=limit+interval, or in other words, I have to sum column 2 when values of column 1, ranges like 0 to 3, 3 to 6, 6 to 9, and 9 to 12, and i want sum of corresponding values of column 2.

我的解决方案就是这样

range- sum
0 to 3 9
3 to 6 19
6 to 9 18

就像我有一个大约7000x2的矩阵.代替范围，也可能会给出序列号.

like that I have a matrix of around 7000x2. In place of range just serial no may also be given.

这只是一个例子.

推荐答案

这是

This is a job for ACCUMARRAY. First, you construct an array of indices of the values that should be added together, then you call accumarray:

%# create test data
A=[ 1 2; 2 3; 3 4; 4 5; 5 6; 6 8; 7 9; 8 5; 9 4];

%# create indices from first column
%# if you have indices already, you can use them directly
%#   or you can convert them to consecutive indices via grp2idx
groupIdx = ceil(A(:,1)/3); %# 0+ to 3 is group 1, 3+ to 6 is group 2, etc

%# sum
result = accumarray(groupIdx,A(:,2),[],@sum)

result =
     9
    19
    18

编辑

如果您需要对范围内的条目进行计数，则它仍然是accumarray的工作，只是您不累积总和，而是累积直方图.

If you need instead to count entries within the ranges, it is still a job for accumarray, only that you don't accumulate into a sum, but into a histogram.

%# use test data, groupIdx from above
A=[ 1 2; 2 3; 3 4; 4 5; 5 6; 6 8; 7 9; 8 5; 9 4];
groupIdx = ceil(A(:,1)/3); %# 0+ to 3 is group 1, 3+ to 6 is group 2, etc

%# find values to count
values2count = unique(A(:,2));

%# count the values
countsPerRange = accumarray(groupIdx,A(:,2),[],@(x){hist(x,values2count)})


%# inspect the counts for range #1
 [values2count,countsPerRange{1}']

ans =

     2     1
     3     1
     4     1
     5     0
     6     0
     8     0
     9     0

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