plot in red, green or blue levels

r

Solution

You could use `colorRampPalette()` (replacing `"red"` with `"blue"` or `"green"` as desired):

 ## Matrix from ?image
 x <- y <- seq(-4*pi, 4*pi, len = 27)
 r <- sqrt(outer(x^2, y^2, "+"))

 ## Plot it using a palette of your choice
 image(z = z <- cos(r^2)*exp(-r/6), 
       col  = colorRampPalette(c("white", "red"))(64))

Problem

Is there a way to plot a matrix/image using the function `plot()` with red or green or blue levels, just like the color option `grey(level, alpha = NULL)`? The grey levels range between 0(black) and 1(white). I am looking for the same thing with RGB: - Red levels would range between 0(red) and 1(white). - Green levels would range between 0(green) and 1(white). - Blue levels would range between 0(blue) and 1(white). How can I do this?

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