如何解决如何创建ggplots列表?
我有这三个数据框和此功能
set.seed(1)
df1 <-
data.frame(
x = c("cat","dog"),y = sample(1:100,20),z = seq(ymd("2020-01-01"),ymd("2020-01-20"),by = "1 day")
)
df2 <-
data.frame(
x = c("red","green"),by = "1 day")
)
df3 <-
data.frame(
x = c("up","down"),by = "1 day")
)
dataframes <-
c("df1","df2","df3")
exploreDataFrames <- function(dataframes,sequence = seq_along(dataframes)){
for (i in seq_along(sequence)){
print(get(dataframes[i]))
gg <-
get(dataframes[i]) %>%
ggplot(aes(z,y,group = 1)) +
geom_line() +
facet_wrap(~get(names(get(dataframes[i]))[1]))
return(gg)
}
}
exploreDataFrames(dataframes[3])
我希望函数返回一个包含三个条目的列表:
list[1][1] <- name_of_the_dataframe
list[1][2] <- copy_of_the_complete_dataframe
list[1][3] <- ggplot_object
我的目标是能够有一个列表,并遍历ggplot图表,可以快速按特定数据框的名称对其进行切片,并提取完整的数据框。
我需要对我的功能进行哪些更改才能使之成为可能?
解决方法
您可以使用
l = sapply(dataframes,function (dfname) {
ggplot(get(dfname),aes(z,y,group = 1)) +
geom_line() +
facet_wrap(~get(names(get(dfname))[1]))
},simplify = FALSE,USE.NAMES = TRUE)
然后data.frame名称在names(l)
names(l[1])
# [1] "df1"
数据在其中
l[[1]]$data
# x y z
#1 cat 68 2020-01-01
#2 dog 39 2020-01-02
#3 cat 1 2020-01-03
#4 dog 34 2020-01-04
#5 cat 87 2020-01-05
#6 dog 43 2020-01-06
#7 cat 14 2020-01-07
#8 dog 82 2020-01-08
#9 cat 59 2020-01-09
#10 dog 51 2020-01-10
#11 cat 85 2020-01-11
#12 dog 21 2020-01-12
#13 cat 54 2020-01-13
#14 dog 74 2020-01-14
#15 cat 7 2020-01-15
#16 dog 73 2020-01-16
#17 cat 79 2020-01-17
#18 dog 37 2020-01-18
#19 cat 83 2020-01-19
#20 dog 97 2020-01-20
,
您需要先初始化整个列表,然后才能开始填充它。由于列表中有嵌套级别,因此也需要启动该“内部”列表:
set.seed(1)
df1 <-
data.frame(
x = c("cat","dog"),y = sample(1:100,20),z = seq(ymd("2020-01-01"),ymd("2020-01-20"),by = "1 day")
)
df2 <-
data.frame(
x = c("red","green"),by = "1 day")
)
df3 <-
data.frame(
x = c("up","down"),by = "1 day")
)
dataframes <-
c("df1","df2","df3")
exploreDataFrames <- function(dataframes,sequence = seq_along(dataframes)){
ll <- list()
for (i in seq_along(sequence)){
ll[[i]] <- list()
ll[[i]][[1]] <- dataframes[i]
# print(get(dataframes[i]))
ll[[i]][[2]] <- get(dataframes[i])
ll[[i]][[3]] <-
get(dataframes[i]) %>%
ggplot(aes(z,group = 1)) +
geom_line() +
facet_wrap(~get(names(get(dataframes[i]))[1]))
}
return(ll)
}
out <- exploreDataFrames(dataframes)
,
要返回问题所要求的列表,请创建一个列表,以在for
循环之前保存对象,并将其长度设置为length(sequence)
,然后在循环中分配值。
exploreDataFrames <- function(dataframes,sequence = seq_along(dataframes)){
out_list <- vector("list",length = length(sequence))
for (i in seq_along(sequence)){
dftmp <- get(dataframes[i])
print(dftmp)
gg <-
dftmp %>%
ggplot(aes(z,group = 1)) +
geom_line() +
facet_wrap(~get(names(dftmp)[1]))
out_list[[i]]$data.name <- dataframes[i]
out_list[[i]]$data <- dftmp
out_list[[i]]$gg.plot <- gg
}
out_list
}
exploreDataFrames(dataframes[3])
这将绘制out_list[[1]]$gg.plot
对象,因为该函数的返回值未分配给任何东西,因此它将返回到.GlobalEnv
。
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