Barplots on a Map
I am trying to plot vertical bar plots over a map. I went through examples online but somehow not being able to.
My data is currently in this format:
University| Count | Category | lat | long
Here is the code that I am trying execute:
library(ggplot2) library(ggmap) library(ggsubplot) df1 <- data.frame( University = c(rep("University1", 4), rep("University2", 4), rep("University3", 4), rep("University4", 4)), Count = sample(1:10, 16, replace = T), Category = rep(c("A", "B", "C", "D")), lat = c(rep(10.902469, 4), rep(17.921959, 4), rep(18.606910, 4), rep(13.202366, 4)), long = c(rep(76.90020, 4), rep(83.42510, 4), rep(73.87501, 4), rep(77.62340, 4)) ) india <- get_map("India", zoom = 5) p <- ggmap(india) p + geom_subplot(data = df1, mapping=aes(x = long, y = lat, group = University, subplot= geom_bar(aes(x = Category, y = Count, color = Category, stat = "identity"))))
When I run the above code, I get the following error:
Error in get(x, envir = this, inherits = inh)(this, ...) : could not find function "%:::%"
Any help would be much appreciated.
Thanks & Regards, Indrajit
You should also use the mapproj package. With the following code:
ggmap(india) + geom_subplot(data = df1, aes(x = long, y = lat, group = University, subplot = geom_bar(aes(x = Category, y = Count, fill = Category, stat = "identity"))))
I got the following result:
As noted in the comments of the question: this solution works in R 2.15.3 but for some reason not in R 3.0.2
UPDATE 16 januari 2014: when you update the ggsubplot package to the latest version, this solution now also works in R 3.0.2
UPDATE 2 oktober 2014: Below the answer of the package author (Garret Grolemund) about the issue mentioned by @jazzuro (text formatting mine):
Unfortunately, ggsubplot is not very stable. ggplot2 was not designed to be extensible or recursive, so the api between ggsubplot and ggplot2 is very jury rigged. I think entropy will assert itself as R continues to update.
The future plan for development is to implement ggsubplot as a built in part of Hadley's new package ggvis. This will be much more maintainable than the ggsubplot + ggplot2 pairing.
I won't be available to debug ggsubplot for several months, but I would be happy to accept pull requests on github.