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From: Marco Wahl <marcowahlsoft@gmail.com>
To: Heiko Schmidt <Heiko.Schmidt@webbedtables.de>
Cc: emacs-orgmode@gnu.org
Subject: Re: ob-calc duplicate stack-element issue
Date: Wed, 18 Mar 2020 15:47:22 +0100	[thread overview]
Message-ID: <84fte5lnyd.fsf@gmail.com> (raw)
In-Reply-To: <9eed12f5-face-eb4f-4006-e8ee7890e0a9@webbedtables.de> (Heiko Schmidt's message of "Sun, 15 Mar 2020 11:46:29 +0100")

Heiko Schmidt <Heiko.Schmidt@webbedtables.de> writes:

> - problem: When evaluating the calc snippets the top of stack element
>    is dropped. Because every "begin/end_src calc" block drops the top
>    of stack, one can't reuse the result in following blocks.

> Number of cars (PKW) in germany:
> #+begin_src calc :exports both
> 45e6
> #+end_src
> : 45000000.
> Yearly mileage in [km/y]
> #+begin_src calc :exports both
> 15000
> #+end_src
> : 15000
> Calculate amount of complete km per year
> #+begin_src calc :exports both
> '*
> #+end_src
> : 675000000000.

> - problem: babel removes the resulting top stack element from the
>    stack
> - tried solution: duplicate the last stack-element on evaluation with
>    "' " (emulate <space> press to duplicate the top element of the
>    stack in calc)

> ** hope for a solution or work around from the community
> - preferred: Is there a way to leave the top of stack from one snippet
>    to the next (which I don't know)?
> - alternative: Is there a way to duplicate the top of stack element
>    between begin/end_src calc blocks?
> - any advice is appreciated.

Okay.  I take here the "any advice is appreciated" part.

AFAICS at the org babel calc evaluation the last value of the calc stack
gets dropped.

So your workaround is okay, I think.  You can just write any dummy
element at the bottom of each block e.g. just 0.  No need of
duplication.  Looks a bit hackish to me but so what?

Another approach could be "noweb".  Example (you would just evaluate the
block at the bottom):

--8<---------------cut here---------------start------------->8---
Number of cars (PKW) in germany:

#+name: numcars
#+begin_src calc :exports both

Yearly mileage in [km/y]

#+name: mileage
#+begin_src calc :exports both

Calculate amount of complete km per year

#+begin_src calc :noweb yes
--8<---------------cut here---------------end--------------->8---

-- Marco

  parent reply	other threads:[~2020-03-18 14:47 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-15 10:46 ob-calc duplicate stack-element issue Heiko Schmidt
2020-03-15 12:06 ` Eric S Fraga
2020-03-15 15:08   ` Heiko Schmidt
2020-03-18 14:47 ` Marco Wahl [this message]
2020-03-18 15:50   ` Eric S Fraga
2020-03-18 16:23     ` Marco Wahl
2020-03-18 16:41       ` Eric S Fraga
2020-04-06  4:39     ` Heiko Schmidt
2020-04-06  4:16   ` Heiko Schmidt

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