r - choroplethr legend not printing for some plots, problems with scale_fill_brewer() -

i have 2 choropleth maps attempting make. first 1 has worked fine. when replicate code/method using different value column, legend not print. difference between 2 sets of code lies in inserting scale_fill_brewer() second plot. using scale_fill_brewer() overriding c$legend?

for example, works:

head(ra, 5)            region value     1     alabama   106     2  california   622     3    colorado    22     4 connecticut    86     5    delaware    43  str(ra) 'data.frame':   51 obs. of  2 variables:  $ region: chr  "alabama" "california" "colorado" "connecticut" ...  $ value : num  106 622 22 86 43 7 232 19 10 121 ...      c = statechoropleth$new(ra)     c$legend = "# of stores"     c$set_num_colors(4)     c$set_zoom(null)     c$show_labels = false     without_abbr = c$render()     without_abbr  

but, following results in "value" in legend:

head(ra, 5)     region      value     1    alabama  5.8703474     2     alaska  0.4880526     3    arizona  4.8851831     4   arkansas  2.7045759     5 california 35.2607419      > str(ra)     'data.frame':   51 obs. of  2 variables:   $ region: chr  "alabama" "alaska" "arizona" "arkansas" ...  $ value : num  5.87 0.488 4.885 2.705 35.261 ...      c = statechoropleth$new(ra)     c$title = "total sales"     c$legend = "$ billions"     c$set_num_colors(4)     c$set_zoom(null)     c$show_labels = false     without_abbr = c$render()     without_abbr + scale_fill_brewer(palette=2) # palette 2 green 

thank using choroplethr.

try this:

without_abbr + scale_fill_brewer(name="legend title", palette=2)  

the issue how ggplot2 handles legends (scales). have option of manually naming scale/legend name parameter. otherwise, looks uses name of column.