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我想从参数化的数据帧中提取信息。 那就是:以参数方式从数据帧中提取信息(通过菜单选择)
A <- c(3, 10, 20, 30, 40)
B <- c(30, 100, 200, 300, 400)
DF <- data.frame(A, B)
DF[A%in%c(1, 2, 3, 4, 5), ] # it works
# But what if this is the case,
# which comes for example out of a user-menu selection:
m <- "A%in%"
k <- c(1, 2, 3, 4, 5)
# How can we make something like that work:
DF[eval(parse(text=c(m, k))), ]