R: Transform vector of values into color specification

as.color {network} | R Documentation

## Transform vector of values into color specification

### Description

Convenience function to convert a vector of values into a color specification.

### Usage

    as.color(x, opacity = 1)

    is.color(x)

### Arguments

`x` | vector of numeric, character or factor values to be transformed
`opacity` | optional numeric value in the range 0.0 to 1.0 used to specify the opacity/transparency (alpha) of the colors to be returned. 0 means fully opaque, 1 means fully transparent. Behavior of `as.color` is as follows: integer numeric values: unchanged, (assumed to corespond to values of R's active `palette`) integer real values: will be translated to into grayscale values ranging between the max and min factor: integer values corresponding to factor levels will be used character: if values are valid colors (as determined by `is.color`) they will be returned as is. Otherwise converted to factor and numeric value of factor returned. The optional `opacity` parameter can be used to make colors partially transparent (as a shortcut for `adjustcolor`. If used, colors will be returned as hex rgb color string (i.e. `"#00FF0080"`) The `is.color` function checks if each character element of `x` appears to be a color name by comparing it to `colors` and checking if it is an HTML-style hex color code. Note that it will return FALSE for integer values. These functions are used for the color parameters of `plot.network`.

### Value

For `as.color`, a vector integer values (corresponding to color palette values) or character color name. For `is.color`, a logical vector indicating if each element of x appears to be a color

`as.color()` returns TRUE if x is a character in a known color format.

### Examples

    as.color(1:3)
    as.color(c('a','b','c'))

    # add some transparency
    as.color(c('red','green','blue'),0.5) # gives "#FF000080", "#00FF0080", "#0000FF80"

    is.color(c('red',1,'foo',NA,'#FFFFFF55'))

[Package network version 1.17.2 Index]