Re: [Csnd-dev] [EXTERNAL] Re: [Csnd-dev] expression with multiple outputs

great, thanks!
(i will look what you do and learn =)

On 22/09/2025 21:53, Eduardo Moguillansky wrote:
> I can add a variant of pan2, if needed
> 
> On Mon, Sep 22, 2025 at 2:45 PM joachim heintz <[email protected] 
> <mailto:[email protected]>> wrote:
> 
>     yes what you say is what i had in mind:
>     "There could be a section in the manual on inlined opcodes giving
>     examples where it can be noted that only opcodes with one output may be
>     inlined."
> 
>     in the case of pan2: might it be an idea to add an array output, as
>     eduardo mentioned?
> 
>     On 22/09/2025 20:42, Victor Lazzarini wrote:
>      > What do you have in mind in terms of documentation?
>      >
>      > There could be a section in the manual on inlined opcodes giving
>     examples where it can be noted that only opcodes with one output may
>     be inlined.
>      >
>      > Note that this is a common approach in other languages that have
>     multiple outputs. In Python tuples are used to handle this,
>      >
>      > def fun(): return 1, 2
>      >
>      > fun()
>      > (1,2)
>      >
>      > def fun2(a,b): return a, b
>      >
>      > fun2(fun())
>      > TypeError: fun2() missing 1 required positional argument 'b'
>      >
>      > fun2(fun()[0], fun()[1])
>      > (1,2)
>      >
>      > In Csound we can do similarly with arrays.
>      >
>      > Prof. Victor Lazzarini
>      > Maynooth University
>      > Ireland
>      >
>      >> On 21 Sep 2025, at 23:13, joachim heintz <[email protected]
>     <mailto:[email protected]>> wrote:
>      >>
>      >> ok --- thanks to all for the explanations and thoughts.
>      >> i wonder where is a good place to document it.
>      >> or is it already anywhere documented?
>      >>
>      >>> On 22/09/2025 04:41, Victor Lazzarini wrote:
>      >>> It's a can of worms. I have discussed this with Steven and we
>     concluded it's a bad idea.
>      >>> Prof. Victor Lazzarini
>      >>> Maynooth University
>      >>> Ireland
>      >>>>> On 21 Sep 2025, at 19:25, Hlöðver Sigurðsson
>     <[email protected] <mailto:[email protected]>> wrote:
>      >>>>
>      >>>> 
>      >>>> in theory the out could infer the [a,a] after I finish this
>     behemoth change regarding struct arrays I could take a look at this
>      >>>>
>      >>>>> On Sun, 21 Sept 2025 at 17:17, Victor Lazzarini
>     <000010b17ddd988e- [email protected] <mailto:dmarc-
>     [email protected]> <mailto:000010b17ddd988e-dmarc-
>     <mailto:000010b17ddd988e-dmarc-> [email protected]
>     <mailto:[email protected]>>> wrote:
>      >>>>
>      >>>>     No, we don't have that syntax and we have decided a while
>     ago that
>      >>>>     we would not try to implement it.
>      >>>>
>      >>>>     So in summary, a multi-output opcode cannot be used inline
>     like this.
>      >>>>
>      >>>>     Prof. Victor Lazzarini
>      >>>>     Maynooth University
>      >>>>     Ireland
>      >>>>
>      >>>>     > On 21 Sep 2025, at 14:35, joachim heintz
>     <[email protected] <mailto:[email protected]>
>      >>>>     <mailto:[email protected] <mailto:[email protected]>>>
>     wrote:
>      >>>>     >
>      >>>>     > *Warning*
>      >>>>     >
>      >>>>     > This email originated from outside of Maynooth
>     University's Mail
>      >>>>     System. Do not reply, click links or open attachments
>     unless you
>      >>>>     recognise the sender and know the content is safe.
>      >>>>     >
>      >>>>     > my assumption was that if out(a1,a2) works, it should
>     also work
>      >>>>     if the
>      >>>>     > two arguments are the outputs of an expression, like here.
>      >>>>     >
>      >>>>     >
>      >>>>     >> On 21/09/2025 22:28, Eduardo Moguillansky wrote:
>      >>>>     >> pan2 returns two outputs, not an array. So I would say
>     that it is a
>      >>>>     >> limitation in the sense that for that to work one would
>     need to
>      >>>>     add a
>      >>>>     >> variant of pan2 which returns an array.
>      >>>>     >>
>      >>>>     >> On Sun, Sep 21, 2025 at 3:18 PM joachim heintz
>      >>>>     <[email protected] <mailto:[email protected]>
>     <mailto:[email protected] <mailto:[email protected]>>
>      >>>>     >> <mailto:[email protected]
>     <mailto:[email protected]> <mailto:[email protected]
>     <mailto:[email protected]>>>> wrote:
>      >>>>     >>
>      >>>>     >>    nchnls = 2
>      >>>>     >>    0dbfs = 1
>      >>>>     >>
>      >>>>     >>    instr 1
>      >>>>     >>        sound:a = pinkish(.1)
>      >>>>     >>        out(pan2(sound,random:i(0,1)))
>      >>>>     >>    endin
>      >>>>     >>    schedule(1,0,1)
>      >>>>     >>
>      >>>>     >>    error: opcode 'pan2' for expression with arg types ai
>      >>>>     returns out-args
>      >>>>     >>    != 1, line 14
>      >>>>     >>
>      >>>>     >>    is this a limitation, or is it supposed to work?
>      >>>>     >>
>      >>>>     >>    thanks -
>      >>>>     >>             joachim
>      >>>>     >>
>      >>>>
>