I do get the following error message:
*Error in lookup.svc[i, j] <- svc[svc$st == unique(svc$st)[i] & svc$vc ==
: *
* replacement has length zero*
I also thought it might be because of how R treats NA, but then I would
expect the loop to stop at the place of error (i=1, j=2) and not continue to
fill out all of column i.
I've tried using %in%, but that seems to do a non-positional check for
whether or not entries are *somewhere *in those vectors. I need to find the
location of where the match occurs.
My goal is to turn this:
st vc y
A Z .2
B Z .4
B Y .3
C Y .1
C X .8
into a 2x2 table with entries 'y'
vc
Z Y X
A .2 0 0
st B .4 .3 0
C 0 .1 .8
Right now it's giving me
vc
Z Y X
A .2 0.000 0.000
st B 0 0 0
C 0 0 0
So it seems to finish out the row that it's currently on, but then won't
continue to loop.
-Robin
On Sun, Apr 25, 2010 at 4:44 PM, Peter Alspach <
peter.alsp...@plantandfood.co.nz> wrote:
> Tena koe Robin
>
> Do you get an error or warning?
>
> It may have something to do with how == treats NA:
>
> x <- 1:4
> x[x == 1]
> [1] 1
> x <- c(1:4, NA)
> x[x == 1]
> [1] 1 NA
> x[x %in% 1]
> [1] 1
>
> If so, using %in% is one way to avoid the problem. However, I would
> have thought you'd get an error message if this were the case.
>
> HTH .....
>
> Peter Alspach
>
> > -----Original Message-----
> > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-
> > project.org] On Behalf Of Robin Jeffries
> > Sent: Monday, 26 April 2010 10:26 a.m.
> > To: r-help@r-project.org
> > Subject: [R] Obvious reason for not looping twice?
> >
> > Is there an obvious reason why this won't loop to i=2 and beyond?
> > There are many combinations of *st* & *vc* that don't exist in svc.
> For
> > example, when s=1 there's only an entry at v=1. That's fine, the
> entry
> > can
> > stay 0.
> >
> > lookup.svc <-
> > array(0,dim=c(length(unique(svc$st)),length(unique(svc$vc))),
> > dimnames=list(unique(svc$st), unique(svc$vc)))
> >
> > for (i in 1:length(unique(svc$st))) {
> > for (j in 1:length(unique(svc$vc))){
> > lookup.svc[i,j] <- svc[svc$st == unique(svc$st)[i] & svc$vc ==
> > unique(svc$vc)[j], 4]
> > }}
> >
> >
> > Thanks,
> > Robin
> >
> > ~~~~~~~~~~~~~~~~~~~
> > -Robin Jeffries
> > Dr.P.H. Candidate
> > UCLA School of Public Health
> > rjeffr...@ucla.edu
> > 530-624-0428
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide http://www.R-project.org/posting-
> > guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
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