On Wed, 2012-03-28 at 11:40 +0100, Chris Beeley wrote:
> I am writing several webpages using the brew package and R2HTML. I would
> like to work off one script so I am using nested brew calls. The
> documentation for brew states that:
>
> "NOTE: brew calls can be nested and rely on placing a function named
> ’.brew.cat’ in the environment in which it is passed. Each time brew is
> called, a check for the existence of this function is made. If it
> exists, then it is replaced with a new copy that is lexically scoped to
> the current brew frame. Once the brew call is done, the function is
> replaced with the previous function. The function is finally removed from
> the environment once all brew calls return."
>
> I'm afraid I can't quite figure out what it is I'm supposed to do here.
> I've tried loading the brew library within the script which I pass to
> brew, and I've tried defining brew cat like this:
The paragraph above describes what brew is doing behind the scenes. It's
not necessary to modify or set the .brew.cat function.
A nested (or recursive) brew call occurs when brew() is called from a
document currently being processed by brew().
To illustrate further, suppose there are two brew documents,
example-1.brew and example-2.brew, where example-1.brew contains the
following text (delimited by '''):
'''
This text is in example-1.brew.
<%= brew::brew("example-2.brew") %>
'''
and the example-2.brew contains
'''
This text is in example-2.brew.
<%= date() -%>
'''
Then from the R prompt we have:
R>brew::brew("example-1.brew")
This text is in example-1.brew.
This text is in example-2.brew.
Thu Mar 29 20:24:52 2012
> .brew.cat=function(){}
>
> This generates the following error message:
>
> Error in .brew.cat(26, 28) : unused argument(s) (26, 28)
>
> I think perhaps it is more likely that I need to insert into the script
> the actual content of .brew.cat, but I can't seem to get R to tell me
> what it is and Googling throws up a lot of stuff about beer and not much
> else (drew a blank also from RSiteSearch("Nested brew"))
>
> Any help gratefully received.
>
> Chris Beeley
> Institute of Mental Health, UK
>
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--
Matthew S. Shotwell
Assistant Professor, Department of Biostatistics
School of Medicine, Vanderbilt University
1161 21st Ave. S2323 MCN Office CC2102L
Nashville, TN 37232-2158
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