ed
Tim Umbach <tim.thomas.umbach at gmail.com> schrieb am Fr., 15. Aug. 2025,
17:28:
>
> <r-help-request at r-project.org> schrieb am Do., 14. Aug. 2025,
12:00:
>
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>> Today's Topics:
>>
>> 1. How to use RColorBrewer in ggplot2? (Luigi Marongiu)
>> 2. Re: How to use RColorBrewer in ggplot2? (Marttila Mikko)
>>
>>
>> ---------- Forwarded message ----------
>> From: Luigi Marongiu <marongiu.luigi at gmail.com>
>> To: r-help <r-help at r-project.org>
>> Cc:
>> Bcc:
>> Date: Thu, 14 Aug 2025 07:25:20 +0200
>> 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
>>
>>
>>
>>
>>
>> ---------- Forwarded message ----------
>> From: Marttila Mikko <mikko.marttila at orionpharma.com>
>> To: Luigi Marongiu <marongiu.luigi at gmail.com>, r-help <
>> r-help at r-project.org>
>> Cc:
>> Bcc:
>> Date: Thu, 14 Aug 2025 08:00:40 +0000
>> Subject: Re: [R] How to use RColorBrewer in ggplot2?
>> 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-bounces at r-project.org> On Behalf Of Luigi
Marongiu
>> Sent: Thursday, 14 August 2025 06:25
>> To: r-help <r-help at 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
>>
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