bpy.colors {sp} | R Documentation

## blue-pink-yellow color scheme, which also prints well on black/white printers

### Description

Create a vector of ‘n’ “contiguous” colors.

### Usage

     bpy.colors(n = 100, cutoff.tails = 0.1, alpha = 1.0)

### Arguments

`n` | number of colors (>= 1) to be in the palette
`cutoff.tails` | tail fraction to be cut off on each side. If 0, this palette runs from black to white; by cutting off the tails, it runs from blue to yellow, which looks nicer.
`alpha` | numeric; alpha transparency, 0 is fully transparent, 1 is opaque.

### Value

A character vector, ‘cv’, of color names. This can be used either to create a user-defined color palette for subsequent graphics by ‘palette(cv)’, a ‘col=’ specification in graphics functions or in ‘par’.

### Note

This color map prints well on black-and-white printers.

### Author(s)

unknown; the pallette was posted to gnuplot-info a few decades ago; R implementation Edzer Pebesma, edzer.pebesma@uni-muenster.de

### See Also

rainbow, cm.colors

### Examples

    bpy.colors(10)
    p <- expand.grid(x=1:30,y=1:30)
    p$z <- p$x + p$y
    coordinates(p) <- c("x", "y")
    gridded(p) <- TRUE
    image(p, col = bpy.colors(100), asp = 1)
    # require(lattice)
    # trellis.par.set("regions", list(col=bpy.colors())) # make this default pallette

[Package sp version 1.2-3 Index]