Re: [R] cloud() works but wireframe() is blank

From: Larry Layne <>
Date: Thu 26 Oct 2006 - 16:50:11 GMT

--On Wednesday, October 25, 2006 4:46 PM -0700 Deepayan Sarkar <> wrote:

> On 10/25/06, Larry Layne <> wrote:
>> Per the message from Alexander Nervedi, 29 April 2006:
>> > I have to be making a riddiculously silly ommission.
>> > when I run the fillowing i get the cloud plot ok. But I cant figure
>> > out what I am missing out when I call wireframe.

>> > Any help would be appreciated.

>> > x<-runif(100)
>> > y<-rnorm(100)
>> > z<-runif(100)

>> > temp <-data.frame(x,y,z)
>> > wireframe(x~y*z,temp)
>> > cloud(x~y*z,temp)

>> There is something funny about the way wireframe treats a data frame
>> object created using "data.frame" vs. using "expand.grid". For instance,
>> this works:
> There's nothing funny about it, ?wireframe clearly says:
> In the case of 'wireframe',
> calculations are based on the assumption that the 'x' and 'y'
> values are evaluated on a rectangular grid defined by their
> unique values.

Sorry about incorrectly interpreting this part of the description about wireframe.

> In the original example, the (x, y) values are clearly not on a grid,
> and in your (very strange) example below, they are not on a
> rectangular grid, as can be seen using
> xyplot(u ~ v, reggrid)

One of the nice things about posting questions in a list is that it is so conveniently easy to embarrass oneself in public. The corrected code follows and works just fine:

u <- mat.or.vec(100,1)
v <- mat.or.vec(100,1)
for(i in 1:10)
    for(j in 1:10)


z <- runif(100)
reggrid <- data.frame(u,v,z)

>> In addition, I would also like to
>> do what Alexander is trying to do, which is create a wireframe from
>> irregular lattice data.

Although what I would really like to do is plot a 3D Triangulated Irregular Network (TIN) surface of the irregularly spaced points, the following sort of gets me there in the short-term:


u <- runif(30)
v <- runif(30)
z <- runif(30)

reggrid <- interp(u,v,z,linear=TRUE,extrap=FALSE)   #WIREFRAME SURFACE PLOT FROM INTERPOLATED DATA wireframe(reggrid$z,scales=list(arrows=FALSE),drape=TRUE,colorkey=TRUE)   #PLOT IMAGE, CONTOUR, AND POINTS
image  (reggrid,add=TRUE)
points (u,v,pch = 3)

Larry Layne mailing list PLEASE do read the posting guide and provide commented, minimal, self-contained, reproducible code. Received on Fri Oct 27 03:12:06 2006

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