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Re: ob-calc duplicate stack-element issue
From: |
Marco Wahl |
Subject: |
Re: ob-calc duplicate stack-element issue |
Date: |
Wed, 18 Mar 2020 15:47:22 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) |
Heiko Schmidt <address@hidden> 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
>
>
> #+RESULTS:
> : 45000000.
>
> Yearly mileage in [km/y]
>
> #+begin_src calc :exports both
> 15000
> #+end_src
>
>
> #+RESULTS:
> : 15000
>
> Calculate amount of complete km per year
>
> #+begin_src calc :exports both
> '*
> #+end_src
>
>
> #+RESULTS:
> : 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
45e6
#+end_src
Yearly mileage in [km/y]
#+name: mileage
#+begin_src calc :exports both
15000
#+end_src
Calculate amount of complete km per year
#+begin_src calc :noweb yes
<<numcars>>
<<mileage>>
'*
#+end_src
--8<---------------cut here---------------end--------------->8---
HTH,
-- Marco