Thank you! On Fri, Aug 15, 2025 at 1:31 PM Achim Zeileis <achim.zeil...@uibk.ac.at> wrote: > > Note that the RColorBrewer colors are also available in base R. The > qualitative palettes are exactly the same as in the palette.colors() > function: > > R> RColorBrewer::brewer.pal(4, "Paired") > [1] "#A6CEE3" "#1F78B4" "#B2DF8A" "#33A02C" > > R> palette.colors(4, "Paired") > [1] "#A6CEE3" "#1F78B4" "#B2DF8A" "#33A02C" > > For the sequential and diverging palettes, very close approximations using > the HCL color model are available in hcl.colors(): > > R> RColorBrewer::brewer.pal(9, "YlGnBu") > [1] "#FFFFD9" "#EDF8B1" "#C7E9B4" "#7FCDBB" "#41B6C4" "#1D91C0" "#225EA8" > [8] "#253494" "#081D58" > > R> hcl.colors(9, "YlGnBu", rev = TRUE) > [1] "#FCFFDD" "#E3F8D4" "#BCE9C5" "#85D5B7" "#18BDB0" "#00A0AE" "#007EB3" > [8] "#004C90" "#26185F" > > Best, > Achim > > On Fri, 15 Aug 2025, Rui Barradas wrote: > > > Hello, > > > > You can create as many colors as you like with > > > > brewer.pal(n, name) > > > > where name is the palette name. > > Then, combine with the other color. > > > > library(ggplot2) > > library(RColorBrewer) > > > > brew_colrs <- brewer.pal(4, "Paired") > > black <- "#000000" > > > > # set the names to the possible value of 'z' > > colrs <- c(brew_cols, black) |> setNames(1:5) > > > > set.seed(50) > > x <- runif(15, 0, 1) > > df <- data.frame(x = x, > > y = x^2 + runif(15, 0, 1), > > z = rep(1:5, 3)) > > > > ggplot(df, aes(x=x, y=y, colour=factor(z))) + > > geom_point(size=4) + > > scale_colour_manual(values = colrs) > > > > > > Hope this helps, > > > > Rui Barradas > > > > > > > > > > On 8/15/2025 5:42 AM, Luigi Marongiu wrote: > >> Thank you, that worked fine. > >> May I also ask how to create a vector of colors with RColorBrewer? > >> Let's say I wanted to color z with 4 shade colors from the "Paired" > >> palette, but then assign the fifth with a color of my choice, say > >> "black", to distinguish clearly the fifth class. > >> If I run > >> ``` > >>> scale_fill_brewer(palette="BrBG") > >> <ggproto object: Class ScaleDiscrete, Scale, gg> > >> aesthetics: fill > >> axis_order: function > >> break_info: function > >> break_positions: function > >> breaks: waiver > >> call: call > >> clone: function > >> dimension: function > >> drop: TRUE > >> expand: waiver > >> get_breaks: function > >> get_breaks_minor: function > >> get_labels: function > >> get_limits: function > >> get_transformation: function > >> guide: legend > >> is_discrete: function > >> is_empty: function > >> labels: waiver > >> limits: NULL > >> make_sec_title: function > >> make_title: function > >> map: function > >> map_df: function > >> n.breaks.cache: NULL > >> na.translate: TRUE > >> na.value: NA > >> name: waiver > >> palette: function > >> palette.cache: NULL > >> position: left > >> range: environment > >> rescale: function > >> reset: function > >> train: function > >> train_df: function > >> transform: function > >> transform_df: function > >> super: <ggproto object: Class ScaleDiscrete, Scale, gg> > >> ``` > >> while the help says "The brewer scales provide sequential, diverging > >> and qualitative colour schemes". > >> How can I generate 4 shades with RColorBrewer? > >> Thanks. > >> > >> On Thu, Aug 14, 2025 at 10:00 AM Marttila Mikko > >> <mikko.martt...@orionpharma.com> wrote: > >>> > >>> Hi Luigi, > >>> > >>> As you map z to colour, you need scale_colour_brewer, not the fill > >>> version. > >>> And to get discrete colours, you need to make z discrete. A separate group > >>> mapping isn't needed in this case. Try this: > >>> > >>> ggplot(df, aes(x=x, y=y, colour=factor(z))) + > >>> geom_point(size=4) + > >>> scale_colour_brewer(palette = "Paired") > >>> > >>> Best, > >>> > >>> Mikko > >>> > >>> -----Original Message----- > >>> From: R-help <r-help-boun...@r-project.org> On Behalf Of Luigi Marongiu > >>> Sent: Thursday, 14 August 2025 06:25 > >>> To: r-help <r-help@r-project.org> > >>> Subject: [R] How to use RColorBrewer in ggplot2? > >>> > >>> Hello, > >>> I would like to define a color range to custom color some plot, > >>> specifically made in ggplot2 (but also for normal plots). > >>> I have been trying to use RColorBrewer but I don't get any value out of > >>> this function. I expected it would create a vector of color values, but I > >>> must be missing something. > >>> What is the correct you of this function? > >>> Thank you. > >>> > >>> EXAMPLE > >>> ``` > >>> set.seed(50) > >>> df = data.frame(x = runif(15, 0, 1), > >>> y = x^2 + runif(15, 0, 1), > >>> z = rep(1:5, 3)) > >>> library(ggplot2) > >>> library(RColorBrewer) > >>> ggplot(df, aes(x=x, y=y, colour=z, group=z)) + > >>> geom_point(size=4) + > >>> scale_fill_brewer(palette = "Paired") > >>> ``` > >>> > >>> > >>> -- > >>> Best regards, > >>> Luigi > >>> > >>> ______________________________________________ > >>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > >>> https://stat.ethz.ch/mailman/listinfo/r-help > >>> PLEASE do read the posting guide > >>> https://www.R-project.org/posting-guide.html > >>> and provide commented, minimal, self-contained, reproducible code. > >>> > >>> > >>> This e-mail transmission may contain confidential or legally privileged > >>> information that is intended only for the individual or entity named in > >>> the e-mail address. If you are not the intended recipient, you are hereby > >>> notified that any disclosure, copying, distribution, or reliance upon the > >>> contents of this e-mail is strictly prohibited. If you have received this > >>> e-mail transmission in error, please reply to the sender, so that they can > >>> arrange for proper delivery, and then please delete the message from your > >>> computer systems. Thank you. > >> > >> > >> > > > > ______________________________________________ > > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide > > https://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. > >
-- Best regards, Luigi ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide https://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
