[R] any plot ?
Roger Peng
rpeng at stat.ucla.edu
Mon Jan 13 04:28:03 CET 2003
You can use a few functions: persp, contour, filled.contour, image. Say
dens() is your density function of two variables, for example,
dens <- function(x, y) { dnorm(x) * dnorm(y) }
then you could do:
x <- seq(-3, 3, len = 40)
y <- seq(-3, 3, len = 30)
g <- expand.grid(x, y)
mat <- matrix(dens(g[,1], g[,2]), nrow = 40, ncol = 30)
image(x,y,mat)
persp(x,y,mat)
filled.contour(x,y,mat)
contour(x,y,mat)
-roger
_______________________________
UCLA Department of Statistics
rpeng at stat.ucla.edu
http://www.stat.ucla.edu/~rpeng
On Sat, 11 Jan 2003, H. Zmarrou wrote:
>
> Dear R-ers:
> I'm sorry to disturb you, I want just ask if R can plot a given
> complicated density function. I mean if we have the expression of the
> density en we want to see how it's look like? and this is a density
> with two variables thus it's a 3D plot
>
> Thank you very much
> Hicham Amsterdam
>
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