| colors3d {colors3d} | R Documentation |
Map values to a 3D legend in RGB colorspace.
Description
This function returns a color value for each row of the 3-column dataset supplied, by transforming the input data and using it as RGB values.
Usage
colors3d(data, trans = "none", order = 1, inversion = 1, opacity = NULL)
Arguments
data |
Matrix or data frame with 3 numeric columns. |
trans |
Either "none" (defaut, histogram is rescaled) or "rank" (histogram is flattened). |
order |
Integer from 1 to 6, each denoting a unique permutation of variables-to-color band mapping. Under the default value of 1, the three variables in 'data' are respectively mapped onto the R, G, and B bands of colorspace. |
inversion |
Integer from 1 to 8, each denoting a unique combination of variables to reverse before mapping. Under the default value of 1, all three variables are mapped with positive values at the high end of the color band. Together with the 'order' parameter, this allows all possible 48 unique mappings of a given set of variables onto 3D colorspace. |
opacity |
Not currently used. |
Value
Character vector of colors.
Examples
d <- expand.grid(x = 1:49, y = 1:49)
d$z <- cos(sqrt((d$x-25)^2 + (d$y-25)^2))
plot(d[, 1:2], col = colors3d(d), pch = 15, cex = 2)
plot(d[, 1:2], col = colors3d(d, order = 2, inversion = 2), pch = 15, cex = 2)