title: R ggmap ggplot2 error "Error: Discrete value supplied to continuous scale"
body: <p>first of all, I apologise.</p>
  
  <p>I know there is numerous threads about this error, however I have tried numerous solutions and I have not managed to get any to solve my issue.</p>
  
  <p>I have tried transforming my data into numerous forms but I still get the same error, or that ggplot2 does not support that data format.</p>
  
  <p>Here is my code:</p>
  
  <pre><code>library(ggmap)
  library(ggplot2)
  library(data.table)
  
  setwd("~/Projects/reformat")
  map &lt;- get_map(location = c(-4,54.5), zoom = 6)
  data &lt;- read.csv('lonlatprice.csv')
  colnames(data) &lt;- c('Longitude','Latitude','Price')
  
  ggmap(map, extent = "device") + geom_point(aes(x = data$Longitude, y = data$Latitude), colour = "red", 
                                                   alpha = 0.1, size = 2)
  </code></pre>
  
  <p>This is what the data format is like:</p>
  
  <pre><code>&gt; head(data)
    Longitude   Latitude  Price
  1 53.778274   -2.48129 147500
  2 52.833819  -0.936527 182000
  3 50.792457   0.046043 193000
  4 51.476984  -0.612126 580000
  5 51.460139   -0.01867 905000
  6 52.235942   1.519404 641500
  </code></pre>
  
  <p>Thanks in advance for help, I have only asked as a last resort after numerous days of no success.</p>