如何在R中合并表? [英] How to merge tables in R?
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问题描述
我认为这将是一个简单的答案,但我无法解决!这是使用iris
数据集的示例:
I think this will have a simple answer, but I can't work it out! Here is an example using the iris
dataset:
a <- table(iris[,2])
b <- table(iris[,3])
如何将这两个表加在一起?例如,在新的输出表中,变量3的值为27(26 + 1),变量3.3的值为8(6 + 2).
How do I add these two tables together? For example, the variable 3 would have a value of 27 (26+1) and variable 3.3 a value of 8 (6+2) in the new output table.
任何帮助,不胜感激.
Any help much appreciated.
推荐答案
如果要使用在a
和b
中都存在的变量,这将起作用:
This will work if you want to use the variables which are present in both a
and b
:
n <- intersect(names(a), names(b))
a[n] + b[n]
# 3 3.3 3.5 3.6 3.7 3.8 3.9 4 4.1 4.2 4.4
# 27 8 8 5 4 7 5 6 4 5 5
如果要使用所有变量:
If you want to use all variables:
n <- intersect(names(a), names(b))
res <- c(a[!(names(a) %in% n)], b[!(names(b) %in% n)], a[n] + b[n])
res[order(names(res))] # sort the results
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