It's been a while since this thread appeared, but I had the same problem
and don't want to keep the solution for myself.
A small, reproducible example:
<<cache=true>>a=1
@
<<>>a+1
@
Compiling with cacheSweave gives an error:
> library(cacheSweave)
Lade n?tiges Paket: filehash
filehash: Simple key-value database (2.0-1 2008-12-19)
Lade n?tiges Paket: stashR
A Set of Tools for Administering SHared Repositories (0.3-3 2009-03-26)
> Sweave("cacheSweaveExample.rnw", driver=cacheSweaveDriver)
Writing to file cacheSweaveExample.tex
Processing code chunks ...
1 : echo term verbatim
Fehler in data.frame(chunk = options$label, chunkprefix = chunkprefix, :
arguments imply differing number of rows: 0, 1
The solution is to use named code chunks as in this corrected example:
<<a, cache=true>>a=1
@
<<b>>a+1
@
The problem is that the cacheSweave driver tries to store the label of a
code chunk, along with other information, in a data frame. If there is
no label, the corresponding variable is NULL which gives an error.
I don't know if this is a bug or intended. I think it is more safe this
way than to rely on some automatic labelling. Anyway, there should be a
note in the documentation.
> Shige Song
> Sat, 25 Jul 2009 20:07:47 -0700
>
> Dear All,
>
> I have been using Sweave (mainly via the Sweave.sh script) and really like
> it. I am working a paper (using Sweave, of course) which includes several
> time-consuming computations, and it gets tedious to re-compile the whoel
> thing every time I made changes. Then I discover the
"cacheSweave" package,
> which seems the right solution to my problem. I only have on problem. Here
> is what I did:
>
> ----------------------------------------------
> <<results=hide,echo=false>>> library(foreign)
> library(Zelig)
> library(memisc)
> options(digits=4)
> @
>
> <<echo=false>>> d <-
read.dta("~/project/abortion/data/data_transition_wide.dta")
> @
>
> ...
>
> ----------------------------------------------
>
> It can be compiled using "Sweave.sh foo.Rnw", but when I tried
"Sweave.sh -c
> foo.Rnw", I got error message:
> "...Processing code chunks ...
> 1 : term hide
> Error in data.frame(chunk = options$label, chunkprefix = chunkprefix, :
> arguments imply differing number of rows: 0, 1"
>
> I thought it might be an imcompatibiltiy problem between the cacheSweave
and
> the foreign packages, but the problem was still there when I tried to read
> the data in using "read.table" function.
>
> Any ideas? Many thanks.
>
> Best,
> Shige
>
--
Andreas Borg
Medizinische Informatik
UNIVERSIT?TSMEDIZIN
der Johannes Gutenberg-Universit?t
Institut f?r Medizinische Biometrie, Epidemiologie und Informatik
Obere Zahlbacher Stra?e 69, 55131 Mainz
www.imbei.uni-mainz.de
Telefon +49 (0) 6131 175062
E-Mail: borg at imbei.uni-mainz.de
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