Question

我正在尝试将localminute绘制为x轴，将meter_value绘制为y轴。数据集有11.9K行，这里是一个片段：

localminute,dataid,meter_value
2016-01-01 05:18:49.497023-06,35,98178  
2016-01-01 05:45:43.51577-06,35,98182  
2016-01-01 05:57:45.024395-06,35,98184  
2016-01-01 06:08:41.532267-06,35,98186  
2016-01-01 06:36:50.053034-06,35,98188  
2016-01-01 06:56:53.066606-06,35,98192  
2016-01-01 08:57:53.65758-06,35,98212

我用过＆＃34; ggplot＆＃34;评论但得到错误＆＃34;使用方法错误（＆＃34;深度＆＃34;）：...

test <- read.csv("test_35.csv")  #read data in csv file, to plot data
ggplot(test, aes(x=localminute, y=meter_value)) + geom_point() +
      ggtitle("meter value for dataID=35") +
      theme(axis.text.x = element_text(angle=90, hjust=1))

Error in UseMethod("depth") : 
  no applicable method for 'depth' applied to an object of class "NULL"`

Answer 1

在读取文件时指定变量的格式：

test <- read.csv('test_35.csv', colClasses = c('POSIXct','integer','integer'))

ggplot错误，x轴上有日期字符串

1 个答案: