R 每小时数据的日期索引

Question

I have a data frame with hourly data and I am trying to plot but I want date on x axis not just index as numbers, I want the dates to be shown on x axis

df = read.csv('~/Desktop/data.csv', header = TRUE , stringsAsFactors = FALSE)
df$Date <- as.POSIXct(strptime(df$Date,format= "%Y-%m-%d %H:%M:%OS"))
plot(df$column1)

Answer 1

The problem with your code seems to be that you feed a single variable into the plot command whereas what you want is a plot of column1 grouped by dates, right? If that's the case then you could use this:

DATA :

set-seed(123)
df <- data.frame(
  dates = rep(c("2009-01-01", "2009-01-02", "2009-01-03", "2009-01-04", "2009-01-05", "2009-01-06", "2009-01-07"), 1000),
  column1 = rnorm(7000, 100)
)

SOLUTION :

Then you could use ggplot2 and geom_jitter to plot column1 against dates :

library(ggplot2)
ggplot(data=df, aes(x=dates, y=column1)) + geom_jitter() 

RESULT :

The resulting plot would roughly look like this: