[PD] Purpose of sig~

[Jamie Bullock]

On 3 Nov 2010, at 16:14, Andy Farnell wrote:

> There are some uses of [sig~] which are not immediately
> obvious but turn out to be desirable. By definition it
> is useful any place you want a message domain value converted
> to a signal, without any further ado. Without it, relying
> only on implicit conversion you might never have access to
> a signal except by a degenerate idiom like
> 
> [$1(
> |
> [line~]
> 
> 
> Crucially, [sig~] can be given a creation parameter, as in
> [sig~ 1], and will not need any messy initialisation 
> like using a [loadbang] in order to obtain a signal 
> constant immediately. 
> 
> Why might you want a signal constant? Perhaps for
> a relation like (1 - x), useful in panning, crossfading,
> or (1 / x) common in waveshaping.
> 
> Matju raises a question over DSP on/off. I have encountered
> problems relying on implicit right inlet conversion 
> with deep abstractions, so from practical experience 
> it seems safer to use [sig~] in these circumsatnces.
> 
> It also make code more readable to make important
> message/signal distinctions explicit.
> 
> 
> 

Thanks Andy. So:

[sig~ 1] 
|
[tabosc4~ foo]

avoids:

[loadbang]
|
|1(
|
[tabosc4~ foo]

This is reason enough for me.

best,

Jamie


> 
> 
> On Wed, 3 Nov 2010 14:46:51 +0000
> Jamie Bullock <jamie at postlude.co.uk> wrote:
> 
>> 
>> Hi all,
>> 
>> This is more of philosophical question than anything else. I'm curious to know why [sig~] hasn't been designed out of Pd. Why not have implicit control -> signal conversion everywhere it is possible?
>> 
>> For example why not allow this?
>> 
>> |2(	|3(
>> |	|
>> [+~ ]
>> 
>> Jamie
>> 
>> --
>> http://www.jamiebullock.com
>> 
>> 
>> 
>> 
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> 
> 
> -- 
> Andy Farnell <padawan12 at obiwannabe.co.uk>
> 
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