为每行求和某些列的单元格 [英] sum cells of certain columns for each row

问题描述

我想计算某些列的总和，然后对每一行应用此总和.不幸的是，我只能走到第一步.我现在如何为每一行实现它?我知道 R 不需要循环；什么是好的方法?

I would like to calculate sums for certain columns and then apply this summation for every row. Unfortunately, I can only get to the first step. How do I now make it happen for each row? I know that R doesn't need loops; what are good approaches?

我的矩阵 (zscore) 如下所示:

My matrix (zscore) looks like this:

   a    b    c    t   y
1  3    4    7    7   4

2  4    56   6    6   4

3  3    3    2    1   7

4  3    88   9    9   9

现在我想根据某些列计算每行的行总和.对于一行，它可能如下所示:

Now I would want to calculate the row sum for each row, based on some of the columns. For one row it could look like this:

f1 <- sum(zscore[1,1:2], zscore[1,3], zscore[1,5])

我现在如何为每一行执行此操作?

How do I do that now for each row?

推荐答案

你可以这样做:

summed <- rowSums(zscore[, c(1, 2, 3, 5)])

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