Problems using datetime variable in ggplot

I am trying to plot a list of datetime variables on the x-axis against a numerical variable using ggplot. However the dates are unordered and visually uninterpretable as the label on x-axis overlap each other. Also the geom_line() function doesn't seem to produce an output.

My data frame looks like this:

     Date         freq
 1  13-04-2015   24
 2  13-05-2015   12
 3  13-06-2015   32
 4  14-04-2015   23
 5  14-05-2015   15
 .
 .
 56   4/1/2015   18
 57  4/10/2015   21
 58  4/11/2015    5

And the code I used is this:

ggplot(count_date1, aes(Date,freq)) + 
  geom_point() + 
  geom_line(aes(group=Date)) +
  xlab("Date") + 
  ylab("No. of Complaints")
#> geom_path: Each group consists of only one observation. Do you need to adjust
#> the group aesthetic?

This is the output I get.

^{Created on 2020-08-14 by the reprex package (v0.3.0)}

Session info

``` r devtools::session_info() #> ─ Session info ─────────────────────────────────────────────────────────────── #> setting value #> version R version 4.0.2 (2020-06-22) #> os macOS Catalina 10.15.6 #> system x86_64, darwin17.0 #> ui X11 #> language (EN) #> collate en_AU.UTF-8 #> ctype en_AU.UTF-8 #> tz Australia/Melbourne #> date 2020-08-14 #> #> ─ Packages ─────────────────────────────────────────────────────────────────── #> package * version date lib source #> assertthat 0.2.1 2019-03-21 [1] CRAN (R 4.0.0) #> backports 1.1.8 2020-06-17 [1] CRAN (R 4.0.2) #> blob 1.2.1 2020-01-20 [1] CRAN (R 4.0.0) #> broom 0.7.0 2020-07-09 [1] CRAN (R 4.0.2) #> callr 3.4.3 2020-03-28 [1] CRAN (R 4.0.0) #> cellranger 1.1.0 2016-07-27 [1] CRAN (R 4.0.0) #> cli 2.0.2 2020-02-28 [1] CRAN (R 4.0.0) #> colorspace 1.4-1 2019-03-18 [1] CRAN (R 4.0.0) #> crayon 1.3.4 2017-09-16 [1] CRAN (R 4.0.0) #> curl 4.3 2019-12-02 [1] CRAN (R 4.0.0) #> DBI 1.1.0 2019-12-15 [1] CRAN (R 4.0.0) #> dbplyr 1.4.4 2020-05-27 [1] CRAN (R 4.0.0) #> desc 1.2.0 2018-05-01 [1] CRAN (R 4.0.0) #> devtools 2.3.1 2020-07-21 [1] CRAN (R 4.0.2) #> digest 0.6.25 2020-02-23 [1] CRAN (R 4.0.0) #> dplyr * 1.0.1 2020-07-31 [1] CRAN (R 4.0.2) #> ellipsis 0.3.1 2020-05-15 [1] CRAN (R 4.0.0) #> evaluate 0.14 2019-05-28 [1] CRAN (R 4.0.0) #> fansi 0.4.1 2020-01-08 [1] CRAN (R 4.0.0) #> farver 2.0.3 2020-01-16 [1] CRAN (R 4.0.0) #> forcats * 0.5.0 2020-03-01 [1] CRAN (R 4.0.0) #> fs 1.5.0 2020-07-31 [1] CRAN (R 4.0.2) #> generics 0.0.2 2018-11-29 [1] CRAN (R 4.0.0) #> ggplot2 * 3.3.2 2020-06-19 [1] CRAN (R 4.0.2) #> glue 1.4.1 2020-05-13 [1] CRAN (R 4.0.0) #> gtable 0.3.0 2019-03-25 [1] CRAN (R 4.0.0) #> haven 2.3.1 2020-06-01 [1] CRAN (R 4.0.0) #> highr 0.8 2019-03-20 [1] CRAN (R 4.0.0) #> hms 0.5.3 2020-01-08 [1] CRAN (R 4.0.0) #> htmltools 0.5.0 2020-06-16 [1] CRAN (R 4.0.2) #> httr 1.4.2 2020-07-20 [1] CRAN (R 4.0.2) #> jsonlite 1.7.0 2020-06-25 [1] CRAN (R 4.0.2) #> knitr 1.29 2020-06-23 [1] CRAN (R 4.0.2) #> labeling 0.3 2014-08-23 [1] CRAN (R 4.0.0) #> lifecycle 0.2.0 2020-03-06 [1] CRAN (R 4.0.0) #> lubridate 1.7.9 2020-06-08 [1] CRAN (R 4.0.0) #> magrittr 1.5 2014-11-22 [1] CRAN (R 4.0.0) #> memoise 1.1.0 2017-04-21 [1] CRAN (R 4.0.0) #> mime 0.9 2020-02-04 [1] CRAN (R 4.0.0) #> modelr 0.1.8 2020-05-19 [1] CRAN (R 4.0.0) #> munsell 0.5.0 2018-06-12 [1] CRAN (R 4.0.0) #> pillar 1.4.6 2020-07-10 [1] CRAN (R 4.0.2) #> pkgbuild 1.1.0 2020-07-13 [1] CRAN (R 4.0.2) #> pkgconfig 2.0.3 2019-09-22 [1] CRAN (R 4.0.0) #> pkgload 1.1.0 2020-05-29 [1] CRAN (R 4.0.0) #> prettyunits 1.1.1 2020-01-24 [1] CRAN (R 4.0.0) #> processx 3.4.3 2020-07-05 [1] CRAN (R 4.0.2) #> ps 1.3.3 2020-05-08 [1] CRAN (R 4.0.0) #> purrr * 0.3.4 2020-04-17 [1] CRAN (R 4.0.0) #> R6 2.4.1 2019-11-12 [1] CRAN (R 4.0.0) #> Rcpp 1.0.5 2020-07-06 [1] CRAN (R 4.0.2) #> readr * 1.3.1 2018-12-21 [1] CRAN (R 4.0.0) #> readxl 1.3.1 2019-03-13 [1] CRAN (R 4.0.0) #> remotes 2.2.0 2020-07-21 [1] CRAN (R 4.0.2) #> reprex 0.3.0 2019-05-16 [1] CRAN (R 4.0.0) #> rlang 0.4.7 2020-07-09 [1] CRAN (R 4.0.2) #> rmarkdown 2.3 2020-06-18 [1] CRAN (R 4.0.2) #> rprojroot 1.3-2 2018-01-03 [1] CRAN (R 4.0.0) #> rvest 0.3.6 2020-07-25 [1] CRAN (R 4.0.2) #> scales 1.1.1 2020-05-11 [1] CRAN (R 4.0.0) #> sessioninfo 1.1.1 2018-11-05 [1] CRAN (R 4.0.0) #> stringi 1.4.6 2020-02-17 [1] CRAN (R 4.0.0) #> stringr * 1.4.0 2019-02-10 [1] CRAN (R 4.0.0) #> testthat 2.3.2 2020-03-02 [1] CRAN (R 4.0.0) #> tibble * 3.0.3 2020-07-10 [1] CRAN (R 4.0.2) #> tidyr * 1.1.1 2020-07-31 [1] CRAN (R 4.0.2) #> tidyselect 1.1.0 2020-05-11 [1] CRAN (R 4.0.0) #> tidyverse * 1.3.0 2019-11-21 [1] CRAN (R 4.0.2) #> usethis 1.6.1 2020-04-29 [1] CRAN (R 4.0.0) #> vctrs 0.3.2 2020-07-15 [1] CRAN (R 4.0.2) #> withr 2.2.0 2020-04-20 [1] CRAN (R 4.0.0) #> xfun 0.16 2020-07-24 [1] CRAN (R 4.0.2) #> xml2 1.3.2 2020-04-23 [1] CRAN (R 4.0.0) #> yaml 2.2.1 2020-02-01 [1] CRAN (R 4.0.0) #> #> [1] /Library/Frameworks/R.framework/Versions/4.0/Resources/library ```

etc5523-2020 / exercise2C

Problems using datetime variable in ggplot #41