ggmap / ggplot error when plotting points on a ggmap: [arguments imply differing number of rows]

Question

The following code works fine:

library(ggmap)
mp2 <- ggmap::get_map(location="South America", zoom = 4, source="google")

ggmap(mp2) +
  geom_point(aes(c(-60), c(-1)), size=15) # plot one single point on map

generating this:

code that works

Though the following won't behave as expected for some reason:

ggmap(mp2) +
  geom_point(aes(c(-60, -65, -62), c(-1, -5, -10)))

giving me the following error:

Error in data.frame(x = c(-60, -65, -62), y = c(-1, -5, -10), PANEL = c(1L,  : 
  arguments imply differing number of rows: 3, 4

using traceback() you can confirm that ggmap internally creates vectors of latitudes and longitudes in line 3: print.ggplot(list(data = list(lon = c(-83.5725316875, -27.3225316875, -83.5725316875, -27.3225316875), lat = c(-34.656848886632, -34.656848886632, 18.9102814177176, 18.9102814177176)) — Silence Dogood
– Silence Dogood, Commented May 9, 2014 at 21:46
Your first block code does not work any longer. May you test it and confirm it? — Omar Gonzales
– Omar Gonzales, Commented Oct 18, 2016 at 3:40
@OmarGonzales Try "Brazil" instead of "South America", it works for some reason. — Dan
– Dan, Commented Oct 18, 2016 at 8:09

Paulo E. Cardoso · Accepted Answer · 2014-05-09 21:34:39Z

2

this should work

df <- data.frame(lon=c(-60, -65, -62), lat = c(-1, -5, -10))
ggmap(mp2) +
  geom_point(aes(x = lon, y = lat), size = 10, data = df)

answered May 9, 2014 at 21:34

Paulo E. Cardoso

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1 Comment

Paulo E. Cardoso Over a year ago

It is my understanding that ggplot is expecting the get the data from data.frames, performing better (easier) with long formatted ones. Without the data.frame ggplot will internally genarate an error: stop("ggplot2 doesn't know how to deal with data of class ", class(model), call. = FALSE).

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