# Transform vector of values into color specification

### Description

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

### Usage

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### 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. |

### Details

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

### Examples

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