[R] Looping syntax?
Michaell Taylor
pols1oh at bestweb.net
Fri Jun 29 19:26:10 CEST 2001
Sorry for what I hope is an unchallenging question for R veterans.
I have a question regarding looping syntax, though I know this should be
avoided if possible in R - as in most other stat languages with which I am
familiar.
I would like to perform a series of operations on the subsets as defined by
condition. Given the following data frame
condition X Y
aa 4 5
aa 8 9
.
.
bb 8 4
bb 3 9
.
.
more ..
There are over 100 condition states, each with several hundred observations.
For ease of this example, lets assume that I wish to make XY plots of each of
the 100 condition states, with In other words, I need a structure like the
following
for state in condition:
identifier <- c("figure N:", cond)
postscript(identifier,height=3,width=6,horizontal=F)
plot(X,Y, main=indentifier)
n <- n+1
(Please excuse the bastardized R syntax, but not knowing the R syntax is the
reason I am now writing) The goal of this structure is to produce a graph
for each unique value of condition which are sequentially numbered and
entitled and saved with the condition state as part of the filename/title of
the plot.
I know this must be simple in R, but the syntax is throwing me. As an aside,
could I get recommendations on the best S-Plus/ R book for data manipulation.
I have Venables & Ripley, "Modern Applied Statistics with S-Plus" and a
smattering of web docs, but nothing seems to go into the details of indexing,
built in fuctions, etc that seem pretty important.
Thanks in Advance.
Michaell Taylor
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