About babel and header arguments

About babel and header arguments

[Henrik Frisk]

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Hi,

I'm not a skilled (scheme) programmer so maybe there is something obvious
I'm missing here. In the first example the header argument y is interpreted
as I would expect it, but in the second it isn't:

#+begin_src scheme :var y=10 :results value
  (+ 10 y)
#+end_src

#+RESULTS:
: 10

but not this:

#+begin_src scheme :var y=10 :results output
  ((lambda (x) (display x)) '(12 y))
#+end_src

#+RESULTS:
: (12 y)

Thanks in advance.

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Re: About babel and header arguments

[tomas]

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On Sun, Apr 10, 2022 at 11:53:51AM +0200, Henrik Frisk wrote:
> Hi,
> 
> I'm not a skilled (scheme) programmer so maybe there is something obvious
> I'm missing here. In the first example the header argument y is interpreted
> as I would expect it, but in the second it isn't:

Hm. You are expecting (12 10)?

> #+begin_src scheme :var y=10 :results value
>   (+ 10 y)
> #+end_src
> 
> #+RESULTS:
> : 10
> 
> but not this:
> 
> #+begin_src scheme :var y=10 :results output
>   ((lambda (x) (display x)) '(12 y))
> #+end_src

The quote extends to the whole (parenthesized) expression, i.e.
the y is quoted too, in there, so it's the symbol y, so that
output is correct:

> #+RESULTS:
> : (12 y)

(That's Scheme, not Babel doing it). I don't know where you
want to go to, but perhaps try:

  (list 12 y)

instead: this would make a list of whatever 12 evaluates to (this
would be 12) and y evaluates to (this would be 10).

Cheers
-- 
t

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Re: About babel and header arguments

[Henrik Frisk]

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> Hm. You are expecting (12 10)?
>
> Yes, sorry for not being clear.


>
> > #+begin_src scheme :var y=10 :results output
> >   ((lambda (x) (display x)) '(12 y))
> > #+end_src
>
> The quote extends to the whole (parenthesized) expression, i.e.
> the y is quoted too, in there, so it's the symbol y, so that
> output is correct:
>
> > #+RESULTS:
> > : (12 y)

Yes, that makes sense now that I see it.


>
> (That's Scheme, not Babel doing it). I don't know where you
> want to go to, but perhaps try:
>
>   (list 12 y)
>
> instead: this would make a list of whatever 12 evaluates to (this
> would be 12) and y evaluates to (this would be 10).
>

Yes, that  works, thank you!
/h

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Re: About babel and header arguments

[Byung-Hee HWANG]

<tomas@tuxteam.de> writes:

> On Sun, Apr 10, 2022 at 11:53:51AM +0200, Henrik Frisk wrote:
>> Hi,
>> 
>> I'm not a skilled (scheme) programmer so maybe there is something obvious
>> I'm missing here. In the first example the header argument y is interpreted
>> as I would expect it, but in the second it isn't:
>
> Hm. You are expecting (12 10)?
>
>> #+begin_src scheme :var y=10 :results value
>>   (+ 10 y)
>> #+end_src
>> 
>> #+RESULTS:
>> : 10
>> 
>> but not this:
>> 
>> #+begin_src scheme :var y=10 :results output
>>   ((lambda (x) (display x)) '(12 y))
>> #+end_src
>
> The quote extends to the whole (parenthesized) expression, i.e.
> the y is quoted too, in there, so it's the symbol y, so that
> output is correct:
>
>> #+RESULTS:
>> : (12 y)
>
> (That's Scheme, not Babel doing it). I don't know where you
> want to go to, but perhaps try:
>
>   (list 12 y)
>
> instead: this would make a list of whatever 12 evaluates to (this
> would be 12) and y evaluates to (this would be 10).
>
> Cheers

Hellow tomas!
Always i learn from you, very good lecture!

Thanks again ^^^

Sincerely, Gnus and Org-mode fan Byung-Hee

-- 
^고맙습니다 _救濟蒼生_ 감사합니다_^))//

Re: About babel and header arguments

[Neil Jerram]

Hi Henrik,

On Sun, 10 Apr 2022 at 10:56, Henrik Frisk <frisk.h@gmail.com> wrote:
>
> Hi,
>
> I'm not a skilled (scheme) programmer so maybe there is something obvious I'm missing here. In the first example the header argument y is interpreted as I would expect it, but in the second it isn't:
>
> #+begin_src scheme :var y=10 :results value
>   (+ 10 y)
> #+end_src
>
> #+RESULTS:
> : 10

I'm surprised by this one - shouldn't we expect the result 20 ?

Best wishes,
    Neil

Re: About babel and header arguments

[tomas]

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On Sun, Apr 10, 2022 at 04:00:31PM +0100, Neil Jerram wrote:
> Hi Henrik,
> 
> On Sun, 10 Apr 2022 at 10:56, Henrik Frisk <frisk.h@gmail.com> wrote:
> >
> > Hi,
> >
> > I'm not a skilled (scheme) programmer so maybe there is something obvious I'm missing here. In the first example the header argument y is interpreted as I would expect it, but in the second it isn't:
> >
> > #+begin_src scheme :var y=10 :results value
> >   (+ 10 y)
> > #+end_src
> >
> > #+RESULTS:
> > : 10
> 
> I'm surprised by this one - shouldn't we expect the result 20 ?

Wait a second... where is this `+' coming from?

*Oh* you mean the first one, I see now. I just skimmed over it and didn't
notice. Unfortunately, "my" geiser seems broken at the moment and I can't
double-check it. But you are right, it should be 20.

Cheers
-- 
t

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Re: About babel and header arguments

[Neil Jerram]

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On Sun, 10 Apr 2022, 16:39 ,<tomas@tuxteam.de> wrote:

> On Sun, Apr 10, 2022 at 04:00:31PM +0100, Neil Jerram wrote:
> > Hi Henrik,
> >
> > On Sun, 10 Apr 2022 at 10:56, Henrik Frisk <frisk.h@gmail.com> wrote:
> > >
> > > Hi,
> > >
> > > I'm not a skilled (scheme) programmer so maybe there is something
> obvious I'm missing here. In the first example the header argument y is
> interpreted as I would expect it, but in the second it isn't:
> > >
> > > #+begin_src scheme :var y=10 :results value
> > >   (+ 10 y)
> > > #+end_src
> > >
> > > #+RESULTS:
> > > : 10
> >
> > I'm surprised by this one - shouldn't we expect the result 20 ?
>
> Wait a second... where is this `+' coming from?
>
> *Oh* you mean the first one, I see now. I just skimmed over it and didn't
> notice. Unfortunately, "my" geiser seems broken at the moment and I can't
> double-check it. But you are right, it should be 20.
>

Thanks tomas!

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Re: About babel and header arguments

[Henrik Frisk]

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> > #+begin_src scheme :var y=10 :results value
> >   (+ 10 y)
> > #+end_src
> >
> > #+RESULTS:
> > : 10
>
> I'm surprised by this one - shouldn't we expect the result 20 ?
>

Hi Neil, yes, that was a typo, I pasted in the wrong result. Sorry for the
confusion!

/h

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