On 05/06/2013 10:18 AM, Vitalie Spinu wrote:
>> Duncan Murdoch <murdoch.dun...@gmail.com>
>> on Wed, 5 Jun 2013 07:59:54 -0400 wrote:
[...]
>> As I take it, it is. Thus, ess/orgmode -- which relies on .Last.value
>> for results handling and does not expect that $visible element -- should
>> adapt and ignore that explicitly?
> I think you'll need to ask on the ESS list what the intentions are in this
case.
> The result of source() is a list with the value and visible entries. This
has
> been true "forever", it's not new behaviour. (It's unfortunate that this
is not
> clearly documented.)
ESS recently switched to "source" for evaluation in order to preserve
source references, and that ruins org-babel (a literate programming
backend) that relies on .Last.value.
Would a
invisible(source('file.R', echo=TRUE)$value)
be a reliable solution to the problem?
You can count on source()$value to return the last value computed in the
source() if there was one. If there were no expressions computed, the
value will be NULL, but NULL$value is also NULL, so perhaps that is good
enough for your purposes.
Duncan Murdoch
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