[R] postscript() and levelplot() in a for loop

[Thomas Lumley]

On Wed, 26 Jan 2005, Wang, Yan wrote:

> Dear Thomas,
>
> It is very interesting to read FAQ 7.22. I don't see any example of
> lattice/trellis graphics linked with print() statement. How should I specify
> print()? Here are the actual codes I used to create the .ps file:
>
> x=y=myaa
> grid=expand.grid(x=x,y=y)
> postscript(paste(./Graphs/",file[k],".ps",sep=""))
> grid$z=as.vector(mymatrix)

print(
> levelplot(z~x*y,grid,at=seq(0,1,by=0.01),scales=list(cex=2),
>          colorkey=list(labels=list(cex=2,at=seq(0,1,by=0.2))),
>          main="mytitle")
)

 	-thomas

> dev.off()
>
> Thank you for any help.
>
> Yan
>
> -----Original Message-----
> From: Thomas Lumley [mailto:tlumley at u.washington.edu]
> Sent: Wednesday, January 26, 2005 11:01 AM
> To: Wang, Yan
> Cc: R-help at stat.math.ethz.ch
> Subject: Re: [R] postscript() and levelplot() in a for loop
>
> On Wed, 26 Jan 2005, Wang, Yan wrote:
>
>> Hi,
>>
>>
>>
>> I like to produce a series of levelplot graphs in postscript file, so I
> put
>> the trunk of codes including postscript() and levelplot() in a for loop.
> The
>> codes work fine outside the loop, but only produce empty .ps file when
> being
>> put within the loop. Is it a problem associated with postscript() or
>> levelplot()? How to get around the problem? Many thanks!
>>
>
> It's hard to be sure without seeing any code, but it sounds like you
> should look at
> FAQ 7.22 Why do lattice/trellis graphics not work?
>
> 	-thomas
>
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Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle