example2.R

# Panel of Choropleth Maps using Facets
# Plot Rahm Emnauel and Gery Chico
choro2 = plotChoropleth(.poly = chicago, .df   = df,
  id1 = list('WARD', 'PRECINCT'),
  id2 = list('ward', 'precinct'),
  field = c('emanuel', 'chico'), 
  title = 'Chicago Mayoral Election 2011',
  legtitle = 'Votes %',
  colpal = 'Blues', n = 5, style = 'pretty') +
  opts(legend.position = c(0.15, 0.25));