CODEWITHSUNDEEP
rdateplotggplot2bar-chart
DJack
DJack

Reputation: 4940

Formatting dates in ggplot horizontal bar graph

I want to make a horizontal bar chart with dates on the x axis using ggplot. Here is the code I have:

df <- data.frame(patient= c('Harry','John'), pain_date = c( as.POSIXct('13-04-2000', format = '%d-%m-%Y'), as.POSIXct('12-02-2000', format = '%d-%m-%Y') ), agony_date = c(as.POSIXct('25-05-2000', format = '%d-%m-%Y'),as.POSIXct('21-05-2000', format = '%d-%m-%Y')), death_date = c(as.POSIXct('30-06-2000', format = '%d-%m-%Y'), as.POSIXct('23-11-2000', format = '%d-%m-%Y')))
ggplot(df, aes(x=patient)) +
geom_linerange(aes(ymin=pain_date, ymax=agony_date), color="red", size=5) +
geom_linerange(aes(ymin=agony_date, ymax=death_date), color="black", size=5) +
coord_flip()

The question is how to fix the limit from JAN to DEC and how to put a tick at every first day of a month?

I've tried several things like:

scale_x_datetime(major="months")
scale_x_datetime(lim = c(as.POSIXct("01-01-2000"), as.POSIXct("31-12-2000")))

but it gives me the following error message:

Erreur : Invalid input: date_trans works with objects of class Date only

Thanks for your help

Upvotes: 3

Views: 2238

Answers (1)

shadow
shadow

Reputation: 22293

Summarizing the comments above, your code should look something like this:

require(scales)
df[, "pain_date"] <- as.Date(df[, "pain_date"])
df[, "agony_date"] <- as.Date(df[, "agony_date"])
df[, "death_date"] <- as.Date(df[, "death_date"])

ggplot(df, aes(x=patient)) +
  geom_linerange(aes(ymin=pain_date, ymax=agony_date), color="red", size=5) +
  geom_linerange(aes(ymin=agony_date, ymax=death_date), color="black", size=5) +
  coord_flip() + scale_y_date(lim = c(as.Date("2000-01-01"), as.Date("2000-12-31")), 
                              breaks=date_breaks(width = "1 month"))

Upvotes: 4

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