ggplot not outputting values in dataframe

Question

I have the following dataframe:

Year Ocean      O2_Conc
   <dbl> <chr>        <dbl>
 1 2010. Reference 0.000237
 2 2010. Pacific   0.000165
 3 2010. Southern  0.000165
 4 2012. Reference 0.000237
 5 2012. Pacific   0.000165
 6 2012. Southern  0.000165
 7 2012. Reference 0.000237
 8 2012. Pacific   0.000165
 9 2012. Southern  0.000165

I would like to plot this data in ggplot2 to produce a scatter plot with different oceans as different colours. I have tried the following code, which has worked for similar data:

ggplot(data=df, aes(x="Year", y="O2_Conc", color="Ocean")) + geom_point()

This has given me this output. Can someone explain why the numbers are not coming through on the graph's axes? GGplot output

Remove the double quotes from the ggplot call.

Rui Barradas
– Rui Barradas

2021-01-12 12:41:02 +00:00
Commented Jan 12, 2021 at 12:41 — Rui Barradas
– Rui Barradas, Commented Jan 12, 2021 at 12:41

Rui Barradas · Accepted Answer · 2021-01-12 12:51:26Z

1

The following code plots the points, not the string "Ocean" but does more. It creates a new variable n counting the repeats of O2_Conc by year and ocean and treats the years as dates.

library(ggplot2)
library(dplyr)

df %>% 
  group_by(Year, Ocean) %>%
  mutate(n = n()) %>%
  mutate(Year = as.Date(paste(Year, "01", "01", sep = "-"))) %>%
  ggplot(aes(Year, O2_Conc, color = Ocean)) +
  geom_point(aes(size = n), alpha = 0.5, show.legend = FALSE) +
  scale_x_date(date_breaks = "year", date_labels = "%Y")

Data

df <- read.table(text = "
Year Ocean      O2_Conc
 1 2010. Reference 0.000237
 2 2010. Pacific   0.000165
 3 2010. Southern  0.000165
 4 2012. Reference 0.000237
 5 2012. Pacific   0.000165
 6 2012. Southern  0.000165
 7 2012. Reference 0.000237
 8 2012. Pacific   0.000165
 9 2012. Southern  0.000165
", header = TRUE)

answered Jan 12, 2021 at 12:51

Rui Barradas

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