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POChoropleth Map in ggplot2
 

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  1. POChoropleth Map in ggplot2
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    <p>I'm trying to reproduce the Choropleth Map given <a href="http://blog.revolutionanalytics.com/2009/11/choropleth-challenge-result.html" rel="nofollow">here</a> with the code provided <a href="https://gist.github.com/hadley/233134" rel="nofollow">by Hadley</a>.</p> <pre><code>library(ggplot2) library(maps) # First (and most annoying) task - get matching state and county variables # for both datasets. And unfortauntely it's not quite right, as you can # see from the finish product - some counties are missing. unemp &lt;- read.csv("unemployment09.csv", header = F, stringsAsFactors = F) names(unemp) &lt;- c("id", "state_fips", "county_fips", "name", "year", "?", "?", "?", "rate") unemp$county &lt;- tolower(gsub(" County, [A-Z]{2}", "", unemp$name)) unemp$state &lt;- gsub("^.*([A-Z]{2}).*$", "\\1", unemp$name) county_df &lt;- map_data("county") names(county_df) &lt;- c("long", "lat", "group", "order", "state_name", "county") county_df$state &lt;- state.abb[match(county_df$state_name, tolower(state.name))] county_df$state_name &lt;- NULL state_df &lt;- map_data("state") # Combine together choropleth &lt;- merge(county_df, unemp, by = c("state", "county")) choropleth &lt;- choropleth[order(choropleth$order), ] # Discretise rate to use with Brewer colour scheme - many options here # choropleth$rate_d &lt;- cut_number(choropleth$rate, 5) # choropleth$rate_d &lt;- cut_interval(choropleth$rate, 5) # Nathan's choice is a little odd: choropleth$rate_d &lt;- cut(choropleth$rate, breaks = c(seq(0, 10, by = 2), 35)) # Once you have the data in the right format, recreating the plot is straight # forward. ggplot(choropleth, aes(long, lat, group = group)) + geom_polygon(aes(fill = rate_d), colour = alpha("white", 1/2), size = 0.2) + geom_polygon(data = state_df, colour = "white", fill = NA) + scale_fill_brewer(pal = "PuRd") </code></pre> <p>But this code gives the following error:</p> <blockquote> <pre><code>Error in do.call("layer", list(mapping = mapping, data = data, stat = stat, : could not find function "alpha" </code></pre> </blockquote> <p>Deleting alpha and using this code </p> <pre><code>ggplot(choropleth, aes(long, lat, group = group)) + geom_polygon(aes(fill = rate_d), colour = "white", size = 0.2) + geom_polygon(data = state_df, colour = "white", fill = NA) + scale_fill_brewer(pal = "PuRd") </code></pre> <p>gives the following error:</p> <blockquote> <p>Error in scale_map.discrete(scale, df[[j]]) : attempt to apply non-function</p> </blockquote> <p>I wonder how I can fix this problem. Any help will be highly appreciated. Thanks</p>
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    1. USMYaseen208
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    1. COTry loading the `scales` package. I'm guessing this code you have is from before when scales was explicitly loaded by ggplot2 by default.
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      1. USTyler Rinker
    2. CO@TylerRinker: Thanks for your comment. Still have error even after loading scales package!!!
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      1. USMYaseen208
    3. COAs Tyler mentioned, load the scales package to find the alpha() function, but the second error arises from `scale_fill_brewer()`; changing pal to palette worked for me.
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      1. POChoropleth Map in ggplot2
      1. USDennis
 

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