r ggplot with zeroes and no comma as the big number separator

debugcn Published at Dev

user3357059

I am trying to count instances by month, plot them on a graph and adding monthly counts to the top of the bars as labels. Below is a reproducible example of the problem I have:

library(scales)
library(ggplot2)

set.seed(1)

df <- data.frame(DueDate = as.Date(paste("2015", 
sample(1:6, 6000, replace=T), 
sample(1:30, 6000, replace=T), sep = "-")),
stringsAsFactors = F)

ggplot(df, aes(as.Date(cut(DueDate,
  breaks = "month")) )) + 
  geom_bar() +
  geom_text(stat = 'bin', 
            aes(label = ..count..),
            vjust = -1, 
            size = 2) +
  scale_y_continuous(labels = comma) +
 labs(x = "Month", y = "Frequency") + 
  theme_minimal()

The issue is that when I create the plot there are 0s between the bars and the numbers on top of the bars do not have commas as the big number separator.

IRTFM

Corrected a couple of errors that were in my comments above. Sampling from a Date-sequence lets you count the 31st days of the month and avoid the NA's from the 29-30th nondays in Feb.

set.seed(1)

df <- data.frame(DueDate = format(
         sample( 
             seq( as.Date("2015-01-01"), 
                  as.Date("2015-06-30"), by="1 day") ,  
             6000,replace=T),     "%b"),
                 stringsAsFactors = F)
    #  This does all the aggregation in one step.
    #  Could probably leave them as Dates and use `format` in the `aes` call
ggplot(df, aes(DueDate)) + 
  geom_bar() +
  geom_text(stat = 'bin', 
            aes(label = formatC(..count.., big.mark=",") ),
            vjust = -1, 
            size = 2) +
  scale_y_continuous(labels = comma) +
 labs(x = "Month", y = "Frequency") + 
  theme_minimal()

Multiplied sample size by two to show that the comma-argument to the y-scale was working.

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edited at2021-07-14

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