使用ggplot时获取提供给连续刻度的离散值

Question

我有以下数据：

library(rjson)
library(ggplot2)


l='[{"a": "abc", "date": "20190506","model": "honda", "features":"weather", "value": 10},
{"a": "abc", "date": "20190506","model": "honda", "features":"bad", "value": 14},
{"a": "abc", "date": "20190506","model": "honda", "features":"failure", "value": 20},
{"a": "abc", "date": "20190506","model": "honda", "features":"not", "value": 1},
{"a": "abc", "date": "20190506","model": "honda", "features":"search", "value": 24},
{"a": "abc", "date": "20190506","model": "honda", "features":"esrs", "value": 2},
{"a": "abc", "date": "20190506","model": "honda", "features":"issue", "value": 1},
{"a": "abc", "date": "20190506","model": "honda", "features":"errors", "value": 30},

{"a": "abc", "date": "20190510","model": "ford", "features":"ice", "value": 12},
{"a": "xyz", "date": "20190509", "model": "honda", "features":"summer", "value":18},
{"a": "xyz", "date": "20190507", "model": "ford", "features":"hot", "value":14},

{"a": "abc", "date": "20190506","model": "ford", "features":"search", "value": 20},
{"a": "abc", "date": "20190510","model": "honda", "features":"400", "value": 18},
{"a": "xyz", "date": "20190509", "model": "ford", "features":"fail", "value":24},
{"a": "xyz", "date": "20190507", "model": "honda", "features":"200", "value":15}]'

当我以数据框的形式使用此数据时，使用以下代码在特征和值之间绘制条形图：

l = fromJSON(l)
df = data.frame(do.call(rbind, l))
ggplot(df, aes(y=features, x=value))

我收到以下错误：

Error: Discrete value supplied to continuous scale

我这里哪里做错了？

Answer 1

我很幸运地使用了 jsonlite 的 fromJSON:

l = jsonlite::fromJSON(l) 
ggplot(l,aes(y=features, x=value)) + 
  geom_point()

编辑：

这是一个条形图。请注意，有两个 "search" 值，默认堆叠在这里。

ggplot(l,aes(x=features, y=value)) + 
  geom_col(color = "white") + 
  coord_flip()

或者如果你想要它们排序，我喜欢 forcats::fct_reorder；但请注意，它是按单个值而不是总值排序的；不确定你想如何对待 "search" 中的两个：

ggplot(l,aes(x=forcats::fct_reorder(features, value), y=value)) + 
  geom_col(color= "white") + coord_flip()

使用ggplot时获取提供给连续刻度的离散值

Getting Discrete Value supplied to continuous scale while using ggplot

r

dataframe

ggplot2

rjson