Description Usage Arguments Examples
Builds a matrix of 4 scatterplots
1  visual.test(x, y)

x 

y 
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19  ## Should be DIRECTLY executable !! 
## ==> Define data, use random,
## or do help(data=index) for the standard data sets.
## The function is currently defined as
function (x, y)
{
oldpar < par(no.readonly = TRUE)
par(mar = c(0, 0, 0, 0))
m < matrix(sample(1:4), 2, 2)
layout(m, 1, 1)
plot(x, y, pch = 20)
abline(0, 0, col = "red", lwd = 1)
for (i in 1:3) {
plot(x, sample(y), pch = 20)
abline(0, 0, col = "red", lwd = 1)
}
par(oldpar)
}

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