I can certainly live with the line number matching some other part of
the code.
Duncan Murdoch wrote:
On 19/08/2010 5:07 PM, Kevin Coombes wrote:
I use it, frequently. The idea for it goes back to some of Knuth's
original literate programming ideas for developing weave and tangle
when he was writing TeX (the program). I want to be able to document
the pieces of some complex algorithm without having to see all of the
gory details. For instance, I have code that looks like the
following. (Note that this is typed on the fly rather than copied
from actual source, so there may be typos.)
Okay, thanks. I'll keep it in. So now I have a question: suppose
you have an error (syntax error at this point, maybe some other kinds
of error in the future) in the <<getInfoAboutThisSample>> chunk, but
that chunk wasn't eval'd, mainloop was eval'd. So the error is going
to be reported as occurring in chunk mainloop, but with a line number
from somewhere else in the file. Is that a problem?
Duncan Murdoch
<<mainloop,keep.source=TRUE,expand=FALSE>>=
for (i in 1:nSamples) {
<<getInfoAboutThisSample>>
for (j in 1:nChromosomes) {
<<getChromosomeDataForCurrentSample>>
<<normalizeChromosomeData>>
<<findSegments>>
<<computeSignificance>>
<<writeResults>>
}
}
@
Each of the <<chunks>> is itself a fairly long piece of code defined
and documented somewhere else. (Some of them may themselves be
written in the same form to reduce the final size of a chunk to
something a human has a chance of understanding. That's the
difference between weave and tangle in the original
implementation.) By blocking expansion, I can focus on the main
steps without having them lost in pages and pages of code.
So I vote strongly for retaining "expand=FALSE".
Best,
Kevin
Duncan Murdoch wrote:
On 19/08/2010 4:29 PM, Claudia Beleites wrote:
I never used it.
I got curious, though. What would be a situation that benefits of
this option?
When I put it in, I thought it would be for people who were writing
about Sweave.
Duncan Murdoch
Maybe a use case could be found by "brute force" (grep all .Rnw
files on CRAN for the option?
Claudia
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