Nothing
mandelbrot <- function(a0, b0, lim) {
a <- a0; b <- b0
a2 <- a * a
b2 <- b * b
n <- 0
while (a2 + b2 < 4 && n < lim) {
b <- 2 * a * b + b0
a <- a2 - b2 + a0
a2 <- a * a
b2 <- b * b
n <- n + 1
}
n
}
ea <- function() {
ix <- iy <- 1
nx <- length(x)
ny <- length(y)
function() {
if (iy > ny) {
stop()
} else {
r <- list(x[ix], y[iy], m)
ix <<- ix + 1
if (ix > nx) {
ix <<- 1
iy <<- iy + 1
}
r
}
}
}
x <- seq(-2.0, 0.6, length.out=240)
y <- seq(-1.3, 1.3, length.out=240)
m <- 100
library(nws)
s <- sleigh()
opts <- list(elementFunc=ea(), chunkSize=length(x)*10, loadFactor=4)
z <- unlist(eachElem(s, mandelbrot, eo=opts))
dim(z) <- c(length(x), length(y))
if (dev.cur() == 1) get(getOption("device"))()
image(x, y, z, col=c(rainbow(m), '#000000'))
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