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

I can add a variant of pan2, if needed

On Mon, Sep 22, 2025 at 2:45 PM joachim heintz <[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]> 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]>
> 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:000010b17ddd988e-dmarc-
> [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]>> 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]>>>
> 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
> >>>>     >>
> >>>>
>