Re: [R] xyplot and for loops

About this list Date view Thread view Subject view Author view Attachment view

From: apjaworski@mmm.com
Date: Wed 05 May 2004 - 09:00:38 EST


Message-id: <OF651DCA1E.73A370DF-ON86256E8A.007E2B23-86256E8A.007E66DC@mmm.com>


Dave,

I think inside the loop you have to explicitly "print" a trellis object,
i.e. say

print(yplot(tmp.df$y.tmp ~ tmp.df[,i]))

If you read the help page for xyplot, look under "Value".

Hope this helps,

Andy

__________________________________
Andy Jaworski
518-1-01
Process Laboratory
3M Corporate Research Laboratory
-----
E-mail: apjaworski@mmm.com
Tel: (651) 733-6092
Fax: (651) 736-3122

                                                                           
             Dave Atkins
             <datkins@u.washin
             gton.edu> To
             Sent by: r-help@stat.math.ethz.ch
             r-help-bounces@st cc
             at.math.ethz.ch
                                                                   Subject
                                       [R] xyplot and for loops
             05/04/2004 05:40
             PM
                                                                           
                                                                           
                                                                           
                                                                           

I'm attempting to use xyplot() within a for() loop to plot the relationship

between a DV and a series of predictor variables, split by 2 conditioning
variables. However, xyplot() does not "seem" to be recognized within the
for()
loop; I don't receive any error message, but nothing is plotted and a
plotting
device is not opened. When I use the generic function plot(), everything
works
as expected. I'm using R v1.9.0 and lattice v0.9-11.

Here's a trivial example:

### create single outcome and two predictors
> y.tmp <- rnorm(20) ; x1.tmp <- rnorm(20) ; x2.tmp <- rnorm(20)
### combine into data.frame
> tmp.df <- data.frame(y.tmp, x1.tmp, x2.tmp)
> tmp.df
         y.tmp x1.tmp x2.tmp
1 1.5022759 -0.150326662 -1.36627981
[snip]
20 1.2667825 -0.070356651 -0.38433160

### simple loop calling the columns of tmp.df to specify x variables
> for (i in 2:3){
+ plot(tmp.df$y.tmp ~ tmp.df[,i])
+ }
### works fine for plot()

### try the same with xyplot()
> for (i in 2:3){
+ xyplot(tmp.df$y.tmp ~ tmp.df[,i])
+ }
### nothing happens; no error msg; no plotting device opened

> xyplot(tmp.df$y.tmp ~ tmp.df[,2])
### without loop works fine and plots relationship of x1.tmp and y.tmp

Can someone see what I'm missing? Any directions/pointers appreciated.

cheers, Dave
datkins@u.washington.edu

______________________________________________
R-help@stat.math.ethz.ch mailing list
https://www.stat.math.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html

______________________________________________
R-help@stat.math.ethz.ch mailing list
https://www.stat.math.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html


About this list Date view Thread view Subject view Author view Attachment view

This archive was generated by hypermail 2.1.3 : Mon 31 May 2004 - 23:05:07 EST