addAlpha: addAlpha()
In makeFlow: Visualizing Sequential Classifications

Description Usage Arguments Value Examples

Adds a specified opacity (between 0 and 1) to any color(s) listed.

1	addAlpha(col, alpha = 1)

`col`	A vector of one or many colors.
`alpha`	A value between 0 and 1. 0 indicates complete transparency. 1 indicates complete opacity.

Returns the Hexadecimal representation of the modified color(s).

## The function is currently defined as
function (col, alpha = 1) 
{
    if (missing(col)) 
        stop("Please provide a vector of colors.")
    apply(sapply(col, col2rgb)/255, 2, function(x) {
        rgb(x[1], x[2], x[3], alpha = alpha)
    })
  }