color

[Michel ARNAUD]

Hi

I have a small question concerning the color of bars in geom_bar.

By default the color of the bars of the histogram is blue with dark blue for the low values of Nbre and light blue for the strong values of Nbre. 
1. How to change the color (green instead of the blue)?
2. How to change the order : darkened for the strong values of Nbre and light for the low values of Nbre

This below my code :

TEMP <- structure(list(Annee = c("2004", "2005", "2006", "2007", "2008", 

"2009", "2010", "2011", "2012", "2013"), Nbre = c(877L, 944L, 

946L, 984L, 1238L, 1201L, 1256L, 1217L, 1349L, 1158L)), .Names = c("Annee", 

"Nbre"), row.names = c(NA, -10L), class = "data.frame")

TEMP$Annee <- factor(TEMP$Annee)

library(ggplot2)

# avec ggplot

ggplot(TEMP, aes(x=Annee, y=Nbre)) +

geom_bar(aes(fill = Nbre), stat="identity", width = 0.7) 

Thank you for your help

Michel

[Dennis Murphy]

Hi:

This is just something to get you started - you probably want a wider
range of colors than what is shown here. I used scale_fill_gradient2()
below; see its on-line help page for more information:
http://docs.ggplot2.org/current/scale_gradient2.html

You might also consider looking into colorRampPalette() or the
colorspace package for more options with scale_gradientn(). There are
several examples in Hadley's ggplot2 book that show how to define a
palette for use in a suitable scale_gradient*() function. (BTW, greens
and reds are not good choices for color palettes - see the help page
above for an explanation why.

#-----

TEMP <- structure(list(Annee = c("2004", "2005", "2006", "2007", "2008",
"2009", "2010", "2011", "2012", "2013"), Nbre = c(877L, 944L,
946L, 984L, 1238L, 1201L, 1256L, 1217L, 1349L, 1158L)), .Names = c("Annee",
"Nbre"), row.names = c(NA, -10L), class = "data.frame")

TEMP$Annee <- factor(TEMP$Annee)

library(ggplot2)
# avec ggplot
ggplot(TEMP, aes(x=Annee, y=Nbre)) +

geom_bar(aes(fill = Nbre), stat="identity", width = 0.7) +
scale_fill_gradient2(high = "darkgreen", low = "greenyellow", mid = "green")
#----


Dennis

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[Michel ARNAUD]

[Michel ARNAUD]

Merci Dennis et bonne journée

Michel