Question

您好我有以下代码

train=jsonlite::fromJSON("/home/felipe/Templates/Archivo de prueba/databritanica.json")

map<-get_map(location="united kingdom"  ,zoom=12,source="osm")

p <- ggmap(map) +
  geom_point(data=train, aes(x=X, y=Y, color=factor(LSOA_name)), alpha=0.05) +
  guides(colour = guide_legend(override.aes = list(alpha=1.0, size=6.0),
                               title="Type of Crime")) +
  scale_colour_brewer(type="qual",palette="Paired") + 
  ggtitle("Top Crimes in Britain") +
  theme_light(base_size=20) +
  theme(axis.line=element_blank(),
        axis.text.x=element_blank(),
        axis.text.y=element_blank(),
        axis.ticks=element_blank(),
        axis.title.x=element_blank(),
        axis.title.y=element_blank())
ggsave("united kingdom_top_crimes_map.png", p, width=14, height=10, units="in")

该脚本的主要目标是从JSON文件中获取数据并映射到我使用get_map获取的地图。

执行此代码会给我这个错误：

eval（expr，envir，enclos）中的错误：找不到对象'X'

JSON文件中包含的数据具有以下格式：

[
    {"Month":"2014-05",
     "Longitude":-2.747770,
     "Latitude":53.389499,
     "Location":"On or near Cronton Road",
     "LSOA_name":"Halton 001B",
     "Crime_type":"Other theft"},

    {"Month":"2014-05",
     "Longitude":-2.799099,
     "Latitude":53.354676,
     "Location":"On or near Old Higher Road",
     "LSOA_name":"Halton 008B",
     "Crime_type":"Anti-social behaviour"},

    Thousands of lines more

]

我在这里缺少什么？可能是什么问题？

更新

这是应用str（train）之后的输出，就像用户pascal说的那样：

str(train)
'data.frame':   10632 obs. of  6 variables:
 $ Month     : chr  "2014-05" "2014-05" "2014-05" "2014-05" ...
 $ Longitude : num  -2.75 -2.8 -2.8 -2.87 -2.87 ...
 $ Latitude  : num  53.4 53.4 53.4 53.5 53.5 ...
 $ Location  : chr  "On or near Cronton Road" "On or near Old Higher Road" "On or near Higher Road" "On or near Sanderling Road" ...
 $ LSOA_name : chr  "Halton 001B" "Halton 008B" "Halton 008B" "Knowsley 001A" ...
 $ Crime_type: chr  "Other theft" "Anti-social behaviour" "Anti-social behaviour" "Anti-social behaviour" ...

现在，这是应用dput（head（train））之后的另一个输出，就像用户42所说的那样

> dput(head(train))
structure(
   list(
    Month = c("2014-05", "2014-05", "2014-05", "2014-05", 
              "2014-05", "2014-05"),
    Longitude = c(-2.74777, -2.799099, -2.804451, 
                 -2.873557, -2.871609, -2.871841),
    Latitude = c(53.389499, 53.354676, 
                 53.352456, 53.485957, 53.489432, 53.489745),
    Location = c("On or near Cronton Road", 
                 "On or near Old Higher Road", "On or near Higher Road",               "On or near Sanderling Road", 
                 "On or near Watts Close", "On or near Gilescroft Avenue"), 
    LSOA_name = c("Halton 001B", 
                  "Halton 008B", "Halton 008B", "Knowsley 001A",                "Knowsley 001A", 
                   "Knowsley 001A"), 
   Crime_type = c("Other theft", "Anti-social behaviour", 
                  "Anti-social behaviour", "Anti-social behaviour",
                  "Anti-social behaviour", 
                  "Anti-social behaviour")), 
   .Names = c("Month", "Longitude", "Latitude", 
              "Location", "LSOA_name", "Crime_type"),
    row.names = c(NA, 6L), class = "data.frame")

这里是变量“train”的输出

eval（expr，envir，enclos）中的错误：找不到对象'X'

0 个答案: