[英]How to get combinations of two factors and convert into a new factor in R
例如,我可以做这样的事情:
x = c(1, 2, 3, 3, 2, 1)
y = c(rep("a", 3), rep("b", 3))
z= ifelse(x==1 & y=="a", "a1", ifelse(x==1 & y=="b", "b1", ifelse(x==2 & y=="a", "a2", ifelse(x==2 & y=="b", "b2", ifelse(x==3 & y=="a", "a3", "b3")))))
z = factor(z)
但这很乏味,有没有更好的方法?
只需使用paste0
组合向量
factor(paste0(y, x))
要么
factor(paste(y, x, sep=""))
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