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[O] sbe with :file header arg?


From: Myles English
Subject: [O] sbe with :file header arg?
Date: Fri, 07 Oct 2011 18:49:34 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.3 (gnu/linux)

Hello,

I think I have one case of strange behaviour and one feature request, if it
isn't already possible.

I would like to make one plot per row of a table.  This is useful because the
contents of the row may be parameters in an R session, and a link to the
resulting plot can be put in the last cell of each row.

The following source block makes a plot:

#+source: plotTest
#+headers: :var A="A" :var B="B" :var C="C"
#+begin_src R :file nofile.png :results graphics :session b
  plot( 1,1, ylab=A, xlab=B)
text(0.8,0.8,C)
#+end_src

#+results: plotTest
[[file:nofile.png]]

and the source block may be called using this table:

#+TBLNAME: testtbl
 | "5" | "X" | "Y" | nofile.png |
 |   7 | P   | "Q" | nofile.png |
#+TBLFM: $4='(sbe plotTest (A $1)(B $2)(C $3))

executing that shows up the strange behaviour because the R interpreter
contains:

> > png(filename="nofile.png")
> A <- "5"
> B <- "X"
> C <- "Y"
>   plot( 1,1, ylab=A, xlab=B)
> text(0.8,0.8,C)
> dev.off()
null device 
          1 
> > png(filename="nofile.png")
> A <- 7
> B <- "/home/myles/org/org/nofile.png"       <------  STRANGE, NO?
> C <- "Q"
>   plot( 1,1, ylab=A, xlab=B)
> text(0.8,0.8,C)
> dev.off()
null device 
          1

Now the feature request; would it be possible to pass a :file header
based on a value in the table, like this?

#+TBLNAME:testtwo
 | a.png | "G" | "E" | "F" | [[img/a.png]] |
#+TBLFM: $4='(sbe plotTest[:file img/$1] (A $2)(B $3)(C $4))

Thanks,

Myles



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