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Gathering Tweets, geocoding users, and plotting them
doInstall <- TRUE
toInstall <- c("twitteR", "dismo", "maps", "ggplot2")
if(doInstall){install.packages(toInstall, repos = "")}
lapply(toInstall, library, character.only = TRUE)
searchTerm <- "#rstats"
searchResults <- searchTwitter(searchTerm, n = 1000) # Gather Tweets
tweetFrame <- twListToDF(searchResults) # Convert to a nice dF
userInfo <- lookupUsers(tweetFrame$screenName) # Batch lookup of user info
userFrame <- twListToDF(userInfo) # Convert to a nice dF
locatedUsers <- !$location) # Keep only users with location info
locations <- geocode(userFrame$location[locatedUsers]) # Use amazing API to guess
# approximate lat/lon from textual location data.
with(locations, plot(lon, lat))
worldMap <- map_data("world") # Easiest way to grab a world map shapefile
zp1 <- ggplot(worldMap)
zp1 <- zp1 + geom_path(aes(x = long, y = lat, group = group), # Draw map
colour = gray(2/3), lwd = 1/3)
zp1 <- zp1 + geom_point(data = locations, # Add points indicating users
aes(x = lon, y = lat),
colour = "RED", alpha = 1/2, size = 1)
zp1 <- zp1 + coord_equal() # Better projections are left for a future post
zp1 <- zp1 + theme_minimal() # Drop background annotations
ronin78 commented Dec 21, 2012

Great example, thanks! I am, however, getting an error on
>searchResults <- searchTwitter(searchTerm, n = 1000)
Error in .self$twFromJSON(out) :
Error: Malformed response from server, was not JSON

After Googling, this may be due to non-Latin characters in some of the tweets. Do you have any suggestions on how to modify the above example so that it is robust to this problem?


Unknown commented Dec 21, 2012

I received the same error. Mine works as long as I run the package "RJSONIO".

ronin78 commented Dec 24, 2012

Thank you! I will try that.


I had the same error. Installing RJSONIO did not seem to help.


you need to install AND load RJSONIO.

So make sure you do


ronin78 commented Jan 3, 2013

RJSONIO did not help me either.

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