[R] barplot that displays sums of values of 2 y colums grouped by different variables
kenneth dyson
kenneth at kidscodejeunesse.org
Mon Jan 15 17:59:34 CET 2018
I am trying to create a barplot displaying the sums of 2 columns of data
grouped by a variable. the data is set up like this:
"city" "n" "y" <br>
mon 100 200 <br>
tor 209 300 <br>
edm 98 87 <br>
mon 20 76 <br>
tor 50 96 <br>
edm 62 27 <br>
the resulting plot should have city as the x-axis, 2 bars per city, 1
representing the sum of "n" in that city, the other the sum of "y" in
that city.
If possible also show the sum in each bar as a label?
I aggregated the data into sums like this:
sum_data <- aggregate(. ~ City,data=raw_data,sum)
this gave me the sums per city as I wanted but for some reason 1 of the
cities is missing in the output.
Using this code for the plot:
ggplot(sum_data,aes(x = City,y = n)) + geom_bar(aes(fill = y),stat =
"identity",position = "dodge")
gave be a bar plot with one bar per city showing the sum of y as a color
gradient. not what I expected given the "dodge" command in geom_bar.
Thanks.
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