Assign colors based on a continuous variable. Useful for
plotting functions where you would like to generate a
gradient based on (a function of) the continuous variables
you are plotting quickly.
Usage
gradient(x, m = 10, cols = c("darkorange", "grey60", "darkblue"))
Arguments
x
a continuous variable to generate colors over.
m
the number of distinct colors you wish to pull
from the pallete.
cols
the colors to interpolate over. passed to
colorRampPalette.
See Also
colorRampPalette
Examples
dat <- data.frame(y=rnorm(100), x=rnorm(100))
with( dat, plot( y ~ x, col=gradient(y) ) )
Results
R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)
R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.
R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.
Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.
> library(Kmisc)
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/Kmisc/gradient.Rd_%03d_medium.png", width=480, height=480)
> ### Name: gradient
> ### Title: Generate Gradient from Continuous Variable
> ### Aliases: gradient
>
> ### ** Examples
>
> dat <- data.frame(y=rnorm(100), x=rnorm(100))
> with( dat, plot( y ~ x, col=gradient(y) ) )
>
>
>
>
>
> dev.off()
null device
1
>