add.alpha: Introduce transparency

Description

Alpha function to introduce transparency

Usage

add.alpha(color, alpha = .5)

Arguments

color

Any color or vector of colors.

alpha

Level for alpha.

encoding

UTF-8

Examples

Run this code

# setup data
x <- seq(0, 50, 1)
supply <- x * -2 + 100
demand <- x * 2
# POINT SIZE AND TRANSPARENCY
plot(supply, demand, pch = 19, cex = 3, col = add.alpha ("red", 0.5))

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