Question

我有一个json格式的时间序列数据，我想从json格式中提取数据并将其转换为R中的数据框。我已经安装了rjson和jsonlite包并加载了库。但是，当我运行＆＃34; fromjson＆＃34;时，我遇到了以下错误。命令。有谁知道如何解决它？

由于

RCODE

   library("rjson", lib.loc="/Users/r_beginer/Library/R/3.0/library")
   library("rjsonlite", lib.loc="/Users/r_beginer/Library/R/3.0/library")
   test_data=fromJSON(file='/Users/r_beginer/Desktop/logins.json')
   Error in is.character(txt) : 'txt' is missing

json格式数据

  ["2014-03-01 00:01:54", "2014-03-01 00:04:52", "2014-03-01 00:06:03", 
   "2014-03-01 00:12:11", "2014-03-01 00:14:54", "2014-03-01 00:16:23", "2014-03-01 00:17:19"]

Answer 1

首先，我想您可能希望致电library(jsonlite)而不是rjsonlite。

你的例子不是很容易复制，但是下面的内容适用于我，正如B.Mr.W指出的那样，JSON中应该有这些值的名称。

library(rjson)

no_name <- '["2014-03-01 00:01:54", "2014-03-01 00:04:52", "2014-03-01 00:06:03", 
   "2014-03-01 00:12:11", "2014-03-01 00:14:54", "2014-03-01 00:16:23", "2014-03-01 00:17:19"]'

write(no_name,"temp.json")

fromJSON(file="temp.json") # returns the correct character array

some_json <- '{"timeStamp":["2014-03-01 00:01:54", "2014-03-01 00:04:52", "2014-03-01 00:06:03", 
   "2014-03-01 00:12:11", "2014-03-01 00:14:54", "2014-03-01 00:16:23", "2014-03-01 00:17:19"]}'

fromJSON(some_json) # returns a list with one element, $timeStamp, a character array

从R中的json格式中提取数据

1 个答案: