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将嵌套列表转换为具有不同列长度的data.frame_R_Dataframe_Nested Lists - Fatal编程技术网

将嵌套列表转换为具有不同列长度的data.frame

将嵌套列表转换为具有不同列长度的data.frame,r,dataframe,nested-lists,R,Dataframe,Nested Lists,我试图将下面的嵌套列表转换为data.frame,但运气不好。有一些并发症,主要是位置1的“结果”栏与位置2不一致,因为位置2没有结果 不同位置的项目长度不一致 我尝试了以下代码,但它们不起作用 #1 m1 <- do.call(rbind, lapply(myDataFrames, function(y) do.call(rbind, y))) relist(m1, skeleton = myDataFrames) #2 relist(matrix(unlist(myDataFrame

我试图将下面的嵌套列表转换为data.frame,但运气不好。有一些并发症,主要是位置1的“结果”栏与位置2不一致,因为位置2没有结果

不同位置的项目长度不一致 我尝试了以下代码,但它们不起作用

#1
m1 <- do.call(rbind, lapply(myDataFrames, function(y) do.call(rbind, y)))
relist(m1, skeleton = myDataFrames)

#2
relist(matrix(unlist(myDataFrames), ncol = 4, byrow = T), skeleton = myDataFrames)

#3
library(data.table)

df<-rbindlist(myDataFrames, idcol = "index")
df<-rbindlist(myDataFrames, fill=TRUE)

#4 
myDataFrame <- do.call(rbind.data.frame, c(myDataFrames, list(stringsAsFactors = FALSE)))
#1

m1我认为我有足够的原始JSON,可以创建一个可复制的示例:

okjson <- '{"html_attributions":[],"results":[{"geometry":{"location":{"lat":25.66544,"lon":-100.4354},"id":"foo","place_id":"quux"}}],"status":"OK"}'
emptyjson <- '{"html_attributions":[],"results":[],"status":"ZERO_RESULTS"}'
jsons <- list(okjson, emptyjson, okjson)
我们现在有了一个
列表
-of-
data.frame,这是一个很好的地方

do.call(rbind.data.frame, c(goodresultsdf, stringsAsFactors = FALSE))
#   geometry.id geometry.place_id geometry.location.lat geometry.location.lon
# 1         foo              quux              25.66544             -100.4354
# 2         foo              quux              25.66544             -100.4354

您好:-)。请附上上述
[[1]]
的完整示例;它不必包含所有的点(如果有很多点),但它应该“关闭”json序列,以便在设置更多属性时知道它。更详细地看一下,它可能像过滤(函数(a)长度(a$results)>0,myDataFrames)
一样简单,以删除那些结果为零的;然后,您可能可以使用
jsonlite::flatte
,然后使用
rbind.data.frame
。请参阅:要点很好,EJoshua。Jessie,如果您将鼠标悬停在convert上,您将看到它显示“请勿使用”,并且该标记“正在被烧掉”。这是一个好主意,但返回此错误消息:错误:参数“txt”必须是JSON字符串、URL或文件。但过滤功能运行良好,输出也与以前的一致。
lists <- lapply(jsons, jsonlite::fromJSON)
str(lists)
# List of 3
#  $ :List of 3
#   ..$ html_attributions: list()
#   ..$ results          :'data.frame': 1 obs. of  1 variable:
#   .. ..$ geometry:'data.frame':   1 obs. of  3 variables:
#   .. .. ..$ location:'data.frame':    1 obs. of  2 variables:
#   .. .. .. ..$ lat: num 25.7
#   .. .. .. ..$ lon: num -100
#   .. .. ..$ id      : chr "foo"
#   .. .. ..$ place_id: chr "quux"
#   ..$ status           : chr "OK"
#  $ :List of 3
#   ..$ html_attributions: list()
#   ..$ results          : list()
#   ..$ status           : chr "ZERO_RESULTS"
#  $ :List of 3
#   ..$ html_attributions: list()
#   ..$ results          :'data.frame': 1 obs. of  1 variable:
#   .. ..$ geometry:'data.frame':   1 obs. of  3 variables:
#   .. .. ..$ location:'data.frame':    1 obs. of  2 variables:
#   .. .. .. ..$ lat: num 25.7
#   .. .. .. ..$ lon: num -100
#   .. .. ..$ id      : chr "foo"
#   .. .. ..$ place_id: chr "quux"
#   ..$ status           : chr "OK"


goodlists <- Filter(function(a) "results" %in% names(a) && length(a$results) > 0, lists)
goodresults <- lapply(goodlists, `[[`, "results")
str(goodresults)
# List of 2
#  $ :'data.frame': 1 obs. of  1 variable:
#   ..$ geometry:'data.frame':  1 obs. of  3 variables:
#   .. ..$ location:'data.frame':   1 obs. of  2 variables:
#   .. .. ..$ lat: num 25.7
#   .. .. ..$ lon: num -100
#   .. ..$ id      : chr "foo"
#   .. ..$ place_id: chr "quux"
#  $ :'data.frame': 1 obs. of  1 variable:
#   ..$ geometry:'data.frame':  1 obs. of  3 variables:
#   .. ..$ location:'data.frame':   1 obs. of  2 variables:
#   .. .. ..$ lat: num 25.7
#   .. .. ..$ lon: num -100
#   .. ..$ id      : chr "foo"
#   .. ..$ place_id: chr "quux"

goodresultsdf <- lapply(goodresults, function(a) jsonlite::flatten(as.data.frame(a)))
str(goodresultsdf)
# List of 2
#  $ :'data.frame': 1 obs. of  4 variables:
#   ..$ geometry.id          : chr "foo"
#   ..$ geometry.place_id    : chr "quux"
#   ..$ geometry.location.lat: num 25.7
#   ..$ geometry.location.lon: num -100
#  $ :'data.frame': 1 obs. of  4 variables:
#   ..$ geometry.id          : chr "foo"
#   ..$ geometry.place_id    : chr "quux"
#   ..$ geometry.location.lat: num 25.7
#   ..$ geometry.location.lon: num -100
do.call(rbind.data.frame, c(goodresultsdf, stringsAsFactors = FALSE))
#   geometry.id geometry.place_id geometry.location.lat geometry.location.lon
# 1         foo              quux              25.66544             -100.4354
# 2         foo              quux              25.66544             -100.4354