Re: Possible Calc support for Org-Babel?

From: Christopher Allan Webber <cwebber@dustycloud.org>
To: Eric Schulte <schulte.eric@gmail.com>
Cc: Matthew Oesting <oestingm@me.com>,
	Eric S Fraga <ucecesf@ucl.ac.uk>,
	emacs-orgmode@gnu.org
Subject: Re: Possible Calc support for Org-Babel?
Date: Wed, 26 Jan 2011 18:39:59 -0600	[thread overview]
Message-ID: <87hbcvnpr4.fsf@dustycloud.org> (raw)
In-Reply-To: <87eib1dxll.fsf@gmail.com> (Eric Schulte's message of "Thu, 04 Nov 2010 07:24:16 -0600")

(failed to wide-reply initially)

I just had use for this for some quick calculations I wanted to add to
one of my files, but...

Any idea why variables inside of parentheses don't work, but variables
outside of them do?

#+BEGIN_SRC calc :var testvar=9000
testvar - 200
#+END_SRC

#+results:
: 8800

#+BEGIN_SRC calc :var testvar=9000
(testvar - 200) 800
#+END_SRC

#+results:
: 800 testvar - 160000

"Eric Schulte" <schulte.eric@gmail.com> writes:

> Alright,
>
> I've just pushed up support for variables.  The following should all
> work as expected (or at least as I would expect them to).  Note that
> most all of these blocks would have an effect on the calc stack.  I
> think the next step would be to allow different sessions to specify
> different stacks.
>
> ** playing with calc support
> #+begin_src emacs-lisp :results silent
>   (require 'ob-calc)
> #+end_src
> #+begin_src calc :var some=8
>   some
>   some
>   '*
>   1
>   '+
> #+end_src
>
> #+results:
> : 65
>
> #+begin_src calc
>   2*(8+8)
> #+end_src
>
> #+results:
> : 32
>
> #+begin_src calc
>   2*e
> #+end_src
>
> #+results:
> : 5.43656365692
>
> #+begin_src calc :var something=9
>   2*something
> #+end_src
>
> #+results:
> : 18
>
> There are very likely some bugs, and as always I'm eager for a calc
> power user to show me the light of how this support could be make more
> "calc idiomatic".
>
> Cheers -- Eric
>
> Eric S Fraga <ucecesf@ucl.ac.uk> writes:
>
>> Forgot to CC the list et al.
>>
>> "Eric Schulte" <schulte.eric@gmail.com> writes:
>>
>>> Eric S Fraga <ucecesf@ucl.ac.uk> writes:
>>
>> [...]
>>
>>>> I now wonder if it would be worthwhile discussing the choices you have
>>>> made regarding stack versus algebraic evaluation.  I would rather have
>>>> the quote mean an algebraic expression, just from the simple reason that
>>>> these will be longer than stack operations and so the overhead of a
>>>> quote is smaller as a percentage of keystrokes...
>>>>
>>>
>>> Hmm, one point against prefixing the algebraic expressions is that they
>>> would be more likely to be used by themselves in an inline code block.
>>
>> Yes, I guess so.  My initial thoughts were that we have plenty of
>> algebraic languages available already through babel (octave, R, python,
>> ...) so why not support a stack based one more directly.   However, the
>> real benefit of calc is that it is *emacs* and not external!  Algebraic
>> is more natural to most people so making it easy for them to express
>> themselves makes sense.
>
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