Re: [R] 3d graph question

From: Duncan Murdoch <murdoch_at_stats.uwo.ca>
Date: Thu, 17 May 2007 16:44:31 -0400

On 5/17/2007 3:42 PM, David Kaplan wrote:
> Hi, this is simple,
>
> I've generated a bivariate normal distribution with a known correlation.
> I want to plot the density function with p(y,x) on the vertical axis
> and x, and y on the horizontal axes. How is that done? Thanks in advance!
>
>
> library(MASS)
> mu <- c(0,1) # mean vector
> sigma <- matrix(c(1,.8,.8,1), ncol=2)
> tmp <- mvrnorm(1000, mu, sigma)
> cor(tmp)
> plot(tmp,ylab='achievement', xlab='ses') # plot data

You need to calculate the density for each element of an array whose rows correspond to x values, and columns to y values. Then persp or contour can plot it (or persp3d in the rgl package).

Duncan Murdoch



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