>>>>> On Tue, 19 Apr 2011 13:59:44 -0700 (PDT),
>>>>> David Epstein (DE) wrote:
> When I re-use a code chunk in Sweave, together with keep.source=TRUE, I
would
> like to follow usual programming conventions in which the amount of white
> space on the left indicates logical structure. It seems that one can't do
> this in Sweave, or am I wrong?
> for (i in ind) {
> do such-and-such and then
> <<code chunk 20>>
> do something-else
> }
> Sweave will say that << is an error. Would it be difficult to change Sweave
> so that formatting in the conventional way becomes possible? I'm thinking
> both of the .Rnw file and of the final output in the .pdf or .ps file.
Not difficult at all, that's a trivial change:
MySyntax <- utils::SweaveSyntaxNoweb
MySyntax$coderef <- "^[[:space:]]*<<(.*)>>.*"
Sweave("test.Rnw", syntax=MySyntax)
should do what you want. That code references need to start in column 1
is inherited from noweb, not sure if we really need it. Cannot think
of a situation where the above regular expression appears in valid R
code, but perhaps I am overlooking something.
Best,
Fritz
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