gradient: Create a matrix from vector to represent colors in gradient

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Description

Create a matrix from vector to represent colors in gradient

Usage

gradient(x, min.color, max.color, alpha = NULL, use.names = TRUE, na.rm = TRUE)

Arguments

x	a numeric vector.
min.color	color of minimum value.
max.color	color of maximum value.
alpha	logical of whether to include alpha channel. NULL to let the function decide by input.
use.names	logical of whether to preserve names of input vector.
na.rm	logical indicating whether to ignore missing values as x is normalized. (defult is TRUE)

Value

a matrix with rgba columns in which each row corresponds to the rgba value (0-255) of each element in input vector x. Use csscolor to convert the matrix to css color strings compatible with web browsers.

See Also

csscolor

Examples

gradient(c(1,2,3,4,5), "white", "red")
gradient(c(5,4,3,2,1), "white", "red")
gradient(c(1,3,2,4,5), "white", "red")
gradient(c(1,3,2,4,5), rgb(0,0,0,0.5), rgb(0,0,0,1), alpha = TRUE)

Example output

      [,1] [,2] [,3] [,4] [,5]
red    255  255  255  255  255
green  255  191  127   63    0
blue   255  191  127   63    0
      [,1] [,2] [,3] [,4] [,5]
red    255  255  255  255  255
green    0   63  127  191  255
blue     0   63  127  191  255
      [,1] [,2] [,3] [,4] [,5]
red    255  255  255  255  255
green  255  127  191   63    0
blue   255  127  191   63    0
      [,1] [,2] [,3] [,4] [,5]
red      0    0    0    0    0
green    0    0    0    0    0
blue     0    0    0    0    0
alpha  128  191  159  223  255

formattable documentation built on Jan. 13, 2021, 7:17 a.m.