Hi, All

I have a data frame as follows: 

> data.class(tapes)
[1] "data.frame"
> names(tapes)
[1] "date"    "loc"     "class"    "drp"     "data"    "scratch"
"reclaim" "total"  

Date is a date; loc, class and drp are factors; the rest are numerics.
I want to generate separate plots by date for the numeric variables for
all combinations of the factors. I tried to do this as follows:

> by(tapes,list(loc,class,drp),plot(date,scratch))
Error in FUN(X[[1L]], ...) : could not find function "FUN" 

As well as the error I get a single plot for all values of scratch and
date which is meaningless. What am I going wrong here? 

For clarification what I want would be done is SAS as something like:

 proc gplot;
  plot scratch*date;
  by loc class drp;
  quit; run;



Jim Lane
Capacity Planner
RBC Financial Group
315 Front St W
6th Floor - H14
Toronto, Ontario CANADA
M5V 3A4
416-348-6024

Display of superior knowledge is as great a vulgarity
as display of superior wealth - greater indeed, inasmuch
as knowledge should tend more definitely than wealth
towards discretion and good manners.

- H. W. Fowler, Modern English Usage

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