highlight a small set of points among a much larger set
Juliet Hannah
I am trying to plot two sets of points using two colors. The second
set is much smaller than the first set, so when I plot them, we cannot
really see the second set among all the points. Here is an example
library("ggplot2")
N1 <- 10000
N2 <- 10
myData1 <- data.frame(x=
rnorm(N1,6,3),y=runif(N1),condition=rep("treatment",N1))
myData2 <- data.frame(x= rnorm(N2,6,3),y=runif(N2),condition=rep("control",N2))
allData <- rbind(myData1,myData2)
library(ggplot2)
p <- ggplot(allData,aes(x=x,y=y,colour=factor(condition)))
p <- p + geom_point()
p
To work around this, I used layers. But then I lose the legend
indicating what the color corresponds to.
library(ggplot2)
p <- ggplot(myData1,aes(x=x,y=y))
p <- p + geom_point(alpha=0.1)
p <- p + layer(data=myData2,mapping=aes(x=x,y=y),geom='point',colour='red')
p
Any suggestions on how to improve my plot. Thanks!
Juliet
Brandon Hurr
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Ben Bolker
Hash: SHA1
This works, more or less ... although I think it's a bit of an
accident. Couldn't figure out the equivalent of scale_alpha_manual,
although I guess one could hack up a way to use scale_alpha_identity ...
ggplot(allData,aes(x=x,y=y,colour=factor(condition),
alpha=as.numeric(condition)))+
geom_point()+
scale_alpha_continuous(legend=FALSE)+
scale_colour_manual(value=c("black","red"))
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Brandon Hurr
Adam_L...@keybank.com
Is it possible (and easy) to extract the names of the colors used in a plot by default, so that one can use the appropriate color when manually adding to the plot?
Adam Loveland
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McCreight
not that I know of, but someone might say otherwise.
another, relatively easy, option is to go to the source code for the
palettes as baptiste sugested here
http://groups.google.com/group/ggplot2/browse_thread/thread/15cd90e165573a24/9ff82794823c84dd?
for scale_hue
https://github.com/hadley/scales/raw/master/R/pal-hue.r
it requires a bit of advance planning, but not much. Other palettes
are listed
https://github.com/hadley/scales/tree/master/R
James
On Feb 17, 1:09 pm, Adam_Lovel...@KeyBank.com wrote:
> Is it possible (and easy) to extract the names of the colors used in a
> plot by default, so that one can use the appropriate color when manually
> adding to the plot?
>
> Adam Loveland
>
> Email Classification: KeyCorp Internal
> This communication may contain privileged and/or confidential information. It
> is intended solely for the use of the addressee. If you are not the intended
> recipient, you are strictly prohibited from disclosing, copying, distributing
> or using any of this information. If you received this communication in error,
> please contact the sender immediately and destroy the material in its entirety,
> whether electronic or hard copy. This communication may contain nonpublic personal
> information about consumers subject to the restrictions of the
> Gramm-Leach-Bliley Act. You may not directly or indirectly reuse or redisclose
> such information for any purpose other than to provide the services for which
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>
> 127 Public Square, Cleveland, OH 44114
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Adam_L...@keybank.com
Thanks very much! That did the trick.
One more quick question - is there a function that translates between hexadecimal representations of colors and the english names?
Thanks again.
Adam Loveland
| McCreight <mccr...@gmail.com>
Sent by: ggp...@googlegroups.com 02/17/2011 03:35 PM |
|
Ben Bolker
Hash: SHA1
On 02/17/2011 04:25 PM, Adam_L...@KeyBank.com wrote:
>
> Thanks very much! That did the trick.
>
> One more quick question - is there a function that translates between
> hexadecimal representations of colors and the english names?
>
plotrix::color.id
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