[ESS] knitr

Stephen Eglen S.J.Eglen at damtp.cam.ac.uk
Thu Jun 7 16:24:25 CEST 2012

Neat, thanks Rodney!

A further OT point, following up to Vitalie's eg of rendering a beamer
frame, I hacked Emacs to render just the current slide at point (bound
to M-C-x -- it seemed like a pretty good analog of  eval-defun to me!)


Now with Rodney's info below, we could do away with xpdf and use docview
to render the resulting pdf slide!


Rodney Sparapani <rsparapa at mcw.edu> writes:

> On 06/07/2012 08:43 AM, Yihui Xie wrote:
>> Yes, I did not expect partial evaluation when I designed knitr, and
>> this sounds like a good idea. Given the current design (parser +
>> evaluator + renderer), I do not think it is hard to allow partial
>> evaluation of a single chunk and return a character string for that
>> chunk. My question is what you are going to do with this partial
>> result; it is not a complete LaTeX document.
>> That being said, I believe the cache feature might be an alternative
>> solution. The main reason that you do not want to compile the whole
>> document is probably about speed. If you enable cache in knitr, it
>> will not take much time on R's side to knit the document. With a PDF
>> viewer like Evince (but not Adobe Reader), you can keep the viewer
>> open and stay at the page that you want to read; when you knit the
>> file again, the page will be updated, so it feels like you are only
>> knitting the current page.
>> Regards,
>> Yihui
> Slightly OT...
> I just wanted to add that I have been playing around with DocView
> in Emacs and I have dumped Evince and Adobe Reader for most of my
> AUCTeX PDF viewing.  Like Evince, the viewer stays at the current
> page while it refreshes, although, it is not real fast.  The beauty
> of DocView (like Emacs itself) is that you can customize it:
> (require 'doc-view)
> (defun doc-view-revert-buffer-no-confirm ()
> "type r or mouse button 1 to revert a PDF without asking for confirmation"
>    (interactive)
>    (doc-view-revert-buffer nil t))
> (defun doc-view-enlarge-2 ()
> "type 2 to double DPI, i.e. enlarge"
>    (interactive)
>    (doc-view-enlarge 1.9))
> (setq doc-view-continuous t)
> (define-key doc-view-mode-map [(C-home)] 'doc-view-first-page)
> (define-key doc-view-mode-map [(C-end)] 'doc-view-last-page)
> (define-key doc-view-mode-map (kbd "r") 'doc-view-revert-buffer-no-confirm)
> (define-key doc-view-mode-map [(mouse-1)] 
> 'doc-view-revert-buffer-no-confirm)
> (define-key doc-view-mode-map (kbd "2") 'doc-view-enlarge-2)
> (add-hook 'doc-view-mode-hook 'auto-revert-mode)
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