如何在apply
调用中通过管道将对象传输到特定位置,这不是第一个输入?magrittr
点占位符似乎不适用于此.
dat <- 1:10
locs <- list(c(1, 2),
c(3, 4),
c(5, 6))
foo <- function(x, y, z) {
out <- mean(c(x[y], x[z]))
return(out)
}
# works
lapply(locs, function(z) foo(dat, z[1], z[2]))
# none of these work
dat %>%
lapply(locs, function(z) foo(., z[1], z[2]))
dat %>%
lapply(locs, function(z) foo((.), z[1], z[2]))
dat %>%
lapply(locs, function(z) {. %>% foo(z[1], z[2])})
# New native pipe and placeholder also do not work
dat |>
lapply(locs, function(z) foo(_, z[1], z[2]))