创建匹配模式的数据帧列表 [英] create list of dataframes matching a pattern

问题描述

这是一个非常简单的问题，但我似乎无法给出答案.我想创建一个匹配模式的 data frames 列表，然后 rm 这些来自全局环境.

This is a very simple question, however I can't seem to come up w/ an answer. I would like to create a list of data frames matching a pattern, then rm these from the global environment.

要匹配的模式是'water_land_by_owntype_*'

这是我尝试过的，但它不起作用......我认为 b/c 它不知道在哪里搜索字符串.

This is what I have tried, but it doesn't work...I think b/c it doesn't know where to search for the string.

rm (matches <- list(
    grep('water_land_by_owntype_*')))

-al

推荐答案

你可以这样做:

# Create some data.frame
water_land_by_owntype_1 <- mtcars
water_land_by_owntype_2 <- mtcars
water_land_by_owntype_3 <- mtcars
water_land_by_owntype_4 <- mtcars
water_land_by_owntype_5 <- mtcars

# Put them in a list
water_land_by_owntype <- lapply(ls(pattern = "water_land_by_owntype_.*"), get)

# or more directly
water_land_by_owntype <- mget(ls(pattern = "water_land_by_owntype_.*"))

# Delete them
rm(list = ls(pattern = "water_land_by_owntype_.*"))

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