r - Error when trying to plot points on a map -


i'm trying plot points on map of uk, size of points changes depending on data.

here part of data file (this first time doing reproducible example - i've used dput on head of file please let me know if there way have done more or better). 

structure(list(v1 = c("st george's", "sheffield", "plymouth",  "exeter", "king's college london", "east anglia"),  sample = c(183l, 139l, 106l, 128l, 152l, 178l),  total = c(417l, 342l, 350l, 520l, 659l, 875l),  response = c(43.9, 40.6, 30.3, 24.6, 23.1, 20.3),  lat = c(51.427194, 53.380941, 50.415735, 50.737137, 51.511486, 52.621921),  long = c(-0.174503, -1.487947, -4.110571, -3.535147, -0.115997, 1.239176)),  .names = c("v1", "sample", "total", "response", "lat", "long"),  row.names = c(na, 6l), class = "data.frame")

once i've got datafile loaded, this:

uk <- map_data(map = "world", region = "uk")  ggplot(data = uk, aes(x = long, y = lat, group = group)) +   geom_polygon() +   geom_point(data = unidata, aes(x = long, y = lat, size = response, col = "red")) +   coord_map()

however, gets me following error:

error in eval(expr, envir, enclos) : object 'group' not found

there group in uk data, , when run code without geom_point line, standard map of uk, assume error in line. however, doesn't seem geom_point requires group. must overlooking something?

it works when move arguments describing dataframe , columns use geom_polygon() element. running following code, desired plot:

ggplot() +   geom_polygon(data = uk, aes(x = long, y = lat, group = group)) +   geom_point(data = unidata, aes(x = long, y = lat, size = response), col = "red") +   coord_map()

i've moved col = "red" argument outside of aes() brackets doesn't show in legend.


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