[英]Subset data based on conditions in R
我有多個輸入,例如:
a <- x y z
1 2 2
2 3 2
3 2 4
4 2 4
5 2 1
b <- c(1,2)
c <- c(2,3)
我想基於a $ x包含大於等於b [i]且小於等於c [i]的條件對該數據進行子集化
輸出應如下所示:
d <- x y z
1 2 2
2 3 2
2 3 2
3 2 4
我已經試過了:
d = as.data.frame(matrix(ncol=3, nrow=0))
names(d) = names(a)
for (i in 1:length(b){
d <- rbind(d,a[which(a$x>=b[i] & a$x<=c[i]),])
}
使用dplyr::filter
函數:
sub_list <- lapply(1:length(b), function(i) a %>% filter(x >= b[i] & x <= c[i]))
do.call(rbind, sub_list)
x y z
1 1 2 2
2 2 3 2
3 2 3 2
4 3 2 4
輸入數據:
a <- structure(list(x = 1:5, y = c(2L, 3L, 2L, 2L, 2L), z = c(2L,
2L, 4L, 4L, 1L)), .Names = c("x", "y", "z"), class = "data.frame", row.names = c(NA,
-5L))
b <- c(1,2)
c <- c(2,3)
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