Re: Possible Calc support for Org-Babel?

[Carsten Dominik <carsten.dominik@gmail.com>]

Cool!

- Carsten

On Oct 29, 2010, at 8:42 AM, Eric Schulte wrote:

> "Eric Schulte" <schulte.eric@gmail.com> writes:
>
>>
>> Although I'm not familiar with using Calc as anything more than a 1- 
>> off
>> calculator in the bottom of the frame (i.e. M-x calc) this sounds  
>> like a
>> good approach to using calc to execute code blocks.
>>
>
> Did I mention I'm not familiar with Calc.
>
> I've thrown together a very naive first pass at a function for
> evaluating calc code blocks.  This inverts the normal calc (as I
> understand it) use of ' prefixes and assumes that every line is an
> algebraic expression unless that line is prefixed with a ' in which  
> case
> it is taken as a stack operation.
>
> This *does* change the value of the stack, allowing multiple code  
> blocks
> to collaborate, in effect treating the stack as a session.  I'd be
> interested to hear what real calc users think of this approach.
>
> Best -- Eric
>
> to use this evaluate the following function, and then try the  
> subsequent
> code blocks
>
> evaluate this code block to add support for calc code blocks
> #+begin_src emacs-lisp
>  (defun org-babel-execute:calc (body params)
>    "Execute a block of calc code with Babel."
>    (mapcar
>     (lambda (line)
>       (when (> (length line) 0)
>         (if (string= "'" (substring line 0 1))
>             (funcall (lookup-key calc-mode-map (substring line 1))  
> nil)
>           (calc-push-list (list (math-read-number (calc-eval  
> line)))))))
>     (split-string body "[\n\r]"))
>    (calc-eval (calc-top 1)))
> #+end_src
>
> This block pushes 1 and 2 on the stack, then adds them
> #+begin_src calc
>  1
>  2
>  '+
> #+end_src
>
> This block evaluates 3^3 with calc pushing the result on the stack and
> returning it into the Org-mode buffer
> #+begin_src calc
>  3^3
> #+end_src
>
> This block evaluates (2+2)*4 pushing the result on the stack, it then
> calls calc-plus adding the top two elements on the stack (one of which
> is left over from the previous code block).
> #+begin_src calc
>  (2+2)*4
>  '+
> #+end_src
>
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- Carsten