Re: Out of Order Evaluation

[Andreas Leha <andreas.leha@med.uni-goettingen.de>]

Andreas Leha <andreas.leha@med.uni-goettingen.de> writes:

> Charles Berry <ccberry@ucsd.edu> writes:
>
>> Andreas Leha <andreas.leha <at> med.uni-goettingen.de> writes:
>>
>>> 
>>> Hi Michael,
>>> 
>>> Michael Weylandt <michael.weylandt <at> gmail.com> writes:
>>> 
>>> > Hi, 
>>> >
>>> > I want to put a summary of my analysis at the beginning of a document
>>> > using results calculated at the end of the document. Is this possible?
>>
>> [snip]
>>
>>> >
>>> > Is this possible in a single pass? 
>>
>>
>> Not quite. The method suggested by Andreas computes the result twice. If
>> there is any randomness in the results (as in the example) you will get a 
>> different answer in the summary than when the block is later evaluated.
>>
>
> Well, you could enter the ':cache yes' world here.  Although, for me,
> that produced more problems than it solved (since there is no tracking
> of dependencies among code blocks in :session mode).
>
> My typical workflow now is something 'less literate':  My typical
> project Org file will look like this:
>
> * Execution
> This is full of #+call: lines.  By (my own) convention, this subtree has
> to be evaluated before exporting the next subsection.
>
> * Report
> This is the report / presentation.
>
> * Analysis
> This contains all the code block to be called from the Execution
> subtree.
> (Plus usually quite a lot of code blocks from dead ends of the
> project...)
>
>
> This solves your problem (and is along the lines Charles suggests as
> well), but requires more work than just export the document and is,
> thus, less literate.

I should add here, that working with #+call lines is not too convenient.
These are missing some functionality compared to source blocks.  Most
importantly 'C-c C-v v' and 'C-c C-v n' are missing.  I wanted to have a
look at those for quite some time, but have not gotten around to do so.

Regards,
Andreas



>
> Regards,
> Andreas
>
>
>
>>> > I've played with #+NAME and
>>> > <<block()>> but haven't gotten the out-of-order evaluation quite
>>> > right.
>>
>> You can use
>>
>> #+results: the-mean
>>
>> before 
>>
>> #+NAME: the-mean
>> #+begin_src R
>> mean(x)
>> #+end_src
>>
>> which is after 'theanalysis' block.
>>
>> And if the format is not pleasing add a filter that reformats the result.
>>
>>
>>> >
>>> > Michael
>>> >
>>> 
>>> How about something along:
>>> 
>>> --8<---------------cut here---------------start------------->8---
>>> #+TITLE: Test
>>> #+AUTHOR: Michael Weylandt
>>> #+PROPERTY: header-args:R :session *__R__* :exports both
>>> 
>>> * Summary
>>> The mean result was src_R[:exports results :var
>> analysisresults=theanalysis()]{mean(unlist(analysisresults))}
>>> 
>>> * Analysis, 
>>> We do some complicated calculations: 
>>> 
>>> #+name: theanalysis
>>> #+BEGIN_SRC R
>>> x <- rnorm(5)
>>> #+END_SRC
>>> --8<---------------cut here---------------end--------------->8---
>>
>>
>> It might be better to mark all the blocks in the doc ':eval never'
>> and ':exports code' or ':exports none' and put blocks before the first 
>> headline that do all the calcs from noweb references, and put the #+results
>> lines (if you need them) wherever you want them in the doc. Like so:
>>
>>
>>
>> #+TITLE: Test
>> #+AUTHOR: Michael Weylandt
>> #+PROPERTY: header-args:R :session *__R__* :exports both
>>
>>
>> #+NAME: master
>> #+BEGIN_SRC R :noweb yes :results silent :exports results
>> <<theanalysis>>
>> #+END_SRC
>>
>> * Summary
>>
>>
>> The mean result was  src_R[:exports results]{mean(x)}
>>
>> * Analysis, 
>> We do some complicated calculations: 
>>
>> #+name: theanalysis
>> #+BEGIN_SRC R :eval never :exports code
>> x <- rnorm(5)
>> #+END_SRC
>>
>>
>> IMO, needing ':exports results' for inline src blocks is a bug not a
>> feature. 
>>
>> HTH,
>>
>> Chuck