R的按行求和
it1352
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问题说明
让我重新提出我的问题，我如何按行对数字求和，并列出最后一列后面的总和，形成一个像第二个表一样的新列(sum = a b c d e)?
Let me reclaim my question, how I can sum the numbers by row, and list the sum follow by the last column, forming a new column like the second table (sum = a b c d e)?
而且我还想知道如果某些值是 N/A 怎么办，我还能将它们视为数字吗?
And I also want to know what if some of the values are N/A, can I still treat them as numbers?
样本输入:
a b c d e
1 90 67 18 39 74
2 100 103 20 45 50
3 80 87 23 44 89
4 95 57 48 79 90
5 74 81 61 95 131
所需的输出:
a b c d e sum
1 90 67 18 39 74 288
2 100 103 20 45 50 318
3 80 87 23 44 89 323
4 95 57 48 79 90 369
5 74 81 61 95 131 442
正确答案
#1
要添加行总和，可以使用 addmargins
To add a row sum, you can use addmargins
M <- matrix(c(90,67,18,39,74), nrow=1)
addmargins(M, 2) #2 = row margin
# [,1] [,2] [,3] [,4] [,5] [,6]
# [1,] 90 67 18 39 74 288
如果您缺少数据，则需要将边距函数更改为可以正确处理 NA 值的内容
If you have missing data, you'll need to change the margin function to something that will properly handle the NA values
M<-matrix(c(90,67,18,NA,74), nrow=1)
addmargins(M, 2, FUN=function(...) sum(..., na.rm=T))
# [,1] [,2] [,3] [,4] [,5] [,6]
# [1,] 90 67 18 NA 74 249
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