[R] How to plot a image with restrictions?

[Cleber N.Borges]

Hello All!


How to plot a image ( image function )
with restrictions, like a polygon??

Thanks in advance!

Cleber N. Borges


##### problem example

x <- y <- seq(-4*pi, 4*pi, len=27)
r <- sqrt(outer(x^2, y^2, "+"))
image( z )
contour(z, add = TRUE, drawlabels = FALSE)

m=scan()
0.2  0.2
0.8  0.2
0.5  0.8

m = matrix(m,nr=3,byrow=T)
polygon( m, lwd=5 )