当格式为日期时，如何不在x轴上显示所有值？ ggplot R

Question

I have a data frame as follows.

TIME                 PRICE
2013-01-01 23:55:03 446.6167
2013-01-01 23:55:02 441.0114
2013-01-01 23:54:59 446.7600

I want to plot the following as a scatter plot in R using ggplot. The times are unique.

I want to plot the data showing x labels only once in every 30 minutes. Can someone help me?

class(inter_1$TRANSACTION_TIME)
[1] "factor"

Thanks in advance!

Answer 1

You need to convert your "TIME" column to a "time" format, since now it is a factor. Something like this would work:

library(anytime)
library(dplyr)
mydf %>% 
  mutate(TIME = anytime(TIME)) %>% 
  as_tibble()

## # A tibble: 2 x 2
##                  TIME    PRICE
##                <dttm>    <dbl>
## 1 2013-01-01 22:55:03 446.6167
## 2 2013-01-01 22:55:02 441.0114

You see that now "TIME" is a "date-time" variable. Then, you can adjust the x-axis using scale_x_date_time .

HTH.