Nothing
bvn.plot <- function (mu = c(0, 0), cv = 0, vr = c(1, 1), res = 0.3, xlab = expression(y[1]), ylab = expression(y[2]),
zlab = expression(paste("f(", y[1], ",", y[2], ")")),...)
{
# require(lattice::wireframe) || stop("function requires package lattice")
mv <- max(vr)
g <- expand.grid(x = seq(mu[1] - 3 * sqrt(mv), mu[1] + 3 *
sqrt(mv), res), y = seq(mu[2] - 3 * sqrt(mv), mu[2] +
3 * sqrt(mv), res))
g$z <- dmvnorm(cbind(g[, 1], g[, 2]), mu, sigma = matrix(nrow = 2,
ncol = 2, data = c(vr[1], cv, cv, vr[2])))
wireframe(z ~ x * y, data = g, xlab = xlab, ylab = ylab, zlab = zlab,
...)
}
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