Check to see if the value is changed, and then if it has gone from 1 to -1.

k2 changed k1
if k2 == 1 && k1 == 1 then
  ;...
else
  ;...
endif


On 8/4/12, peiman khosravi  wrote:
> Since I'm on a roll here is another question.
>
> How does one detect a control signal change from 1 to <1? Is there a known
> trick for this? Would an opcode be useful? I know the edge~ msp object (I
> think that's what it's called) does this, which is really handy. Been
> trying to work out if sample and hold would do it, but I don't think so.
>
> Thanks
> Peiman
>
> Send bugs reports to the Sourceforge bug tracker
>             https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe
> csound"
>
>

changed will tell you if a signal has changed at all (1 if changed, 0 if not)

if you are specifically looking for the sign of the signal there is:
ksign = (ksig < 0) ? 1 : 0


On Sat, Aug 4, 2012 at 2:00 PM, peiman khosravi
 wrote:
> Since I'm on a roll here is another question.
>
> How does one detect a control signal change from 1 to <1? Is there a known
> trick for this? Would an opcode be useful? I know the edge~ msp object (I
> think that's what it's called) does this, which is really handy. Been trying
> to work out if sample and hold would do it, but I don't think so.
>
> Thanks
> Peiman

or this way:



instr test
kprev init 0
krand randomh 0, 1, 10
knew = round(krand)
;printk2 knew
  if kprev == 1 && knew < 1 then
printks "Changed from 1 to %d\n", 0, knew
  endif
kprev = knew
endin


i "test" 0 3



	j

Am 04.08.2012 23:12, schrieb Justin Smith:
> changed will tell you if a signal has changed at all (1 if changed, 0 if not)
>
> if you are specifically looking for the sign of the signal there is:
> ksign = (ksig < 0) ? 1 : 0
>
>
> On Sat, Aug 4, 2012 at 2:00 PM, peiman khosravi
>  wrote:
>> Since I'm on a roll here is another question.
>>
>> How does one detect a control signal change from 1 to <1? Is there a known
>> trick for this? Would an opcode be useful? I know the edge~ msp object (I
>> think that's what it's called) does this, which is really handy. Been trying
>> to work out if sample and hold would do it, but I don't think so.
>>
>> Thanks
>> Peiman
>
>
> Send bugs reports to the Sourceforge bug tracker
>              https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
>
>

Most languages have a ?: operator (Python being a notable exception).

a cond b ? c : d
c executes if a cond b is true; d if false.

On 8/4/12, peiman khosravi  wrote:
> Thanks joachim,
>
> Aha, that trick with 'kprev = knew' does the job.
>
> I've got to brush up on my conditionals!
>
> Thanks
>
> On 4 August 2012 22:22, joachim heintz  wrote:
>
>> or this way:
>>
>> 
>> 
>> instr test
>> kprev init 0
>> krand randomh 0, 1, 10
>> knew = round(krand)
>> ;printk2 knew
>>  if kprev == 1 && knew < 1 then
>> printks "Changed from 1 to %d\n", 0, knew
>>  endif
>> kprev = knew
>> endin
>> 
>> 
>> i "test" 0 3
>> 
>> 
>>
>>         j
>>
>> Am 04.08.2012 23:12, schrieb Justin Smith:
>>
>>  changed will tell you if a signal has changed at all (1 if changed, 0 if
>>> not)
>>>
>>> if you are specifically looking for the sign of the signal there is:
>>> ksign = (ksig < 0) ? 1 : 0
>>>
>>>
>>> On Sat, Aug 4, 2012 at 2:00 PM, peiman khosravi
>>>  wrote:
>>>
>>>> Since I'm on a roll here is another question.
>>>>
>>>> How does one detect a control signal change from 1 to <1? Is there a
>>>> known
>>>> trick for this? Would an opcode be useful? I know the edge~ msp object
>>>> (I
>>>> think that's what it's called) does this, which is really handy. Been
>>>> trying
>>>> to work out if sample and hold would do it, but I don't think so.
>>>>
>>>> Thanks
>>>> Peiman
>>>>
>>>
>>>
>>> Send bugs reports to the Sourceforge bug tracker
>>>              https://sourceforge.net/**tracker/?group_id=81968&atid=**
>>> 564599 
>>> Discussions of bugs and features can be posted here
>>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe
>>> csound"
>>>
>>>
>>>
>>
>> Send bugs reports to the Sourceforge bug tracker
>>
>> https://sourceforge.net/**tracker/?group_id=81968&atid=**564599
>> Discussions of bugs and features can be posted here
>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe
>> csound"
>>
>>
>
> Send bugs reports to the Sourceforge bug tracker
>             https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe
> csound"
>
>

also related, the trigger opcode
Oeyvind

2012/8/4 peiman khosravi :
> Great, thanks very much.
>
> P
>
>
> On 4 August 2012 22:34, Adam Puckett  wrote:
>>
>> Most languages have a ?: operator (Python being a notable exception).
>>
>> a cond b ? c : d
>> c executes if a cond b is true; d if false.
>>
>> On 8/4/12, peiman khosravi  wrote:
>> > Thanks joachim,
>> >
>> > Aha, that trick with 'kprev = knew' does the job.
>> >
>> > I've got to brush up on my conditionals!
>> >
>> > Thanks
>> >
>> > On 4 August 2012 22:22, joachim heintz  wrote:
>> >
>> >> or this way:
>> >>
>> >> 
>> >> 
>> >> instr test
>> >> kprev init 0
>> >> krand randomh 0, 1, 10
>> >> knew = round(krand)
>> >> ;printk2 knew
>> >>  if kprev == 1 && knew < 1 then
>> >> printks "Changed from 1 to %d\n", 0, knew
>> >>  endif
>> >> kprev = knew
>> >> endin
>> >> 
>> >> 
>> >> i "test" 0 3
>> >> 
>> >> 
>> >>
>> >>         j
>> >>
>> >> Am 04.08.2012 23:12, schrieb Justin Smith:
>> >>
>> >>  changed will tell you if a signal has changed at all (1 if changed, 0
>> >> if
>> >>> not)
>> >>>
>> >>> if you are specifically looking for the sign of the signal there is:
>> >>> ksign = (ksig < 0) ? 1 : 0
>> >>>
>> >>>
>> >>> On Sat, Aug 4, 2012 at 2:00 PM, peiman khosravi
>> >>>  wrote:
>> >>>
>> >>>> Since I'm on a roll here is another question.
>> >>>>
>> >>>> How does one detect a control signal change from 1 to <1? Is there a
>> >>>> known
>> >>>> trick for this? Would an opcode be useful? I know the edge~ msp
>> >>>> object
>> >>>> (I
>> >>>> think that's what it's called) does this, which is really handy. Been
>> >>>> trying
>> >>>> to work out if sample and hold would do it, but I don't think so.
>> >>>>
>> >>>> Thanks
>> >>>> Peiman
>> >>>>
>> >>>
>> >>>
>> >>> Send bugs reports to the Sourceforge bug tracker
>> >>>              https://sourceforge.net/**tracker/?group_id=81968&atid=**
>> >>> 564599 
>> >>> Discussions of bugs and features can be posted here
>> >>> To unsubscribe, send email sympa@lists.bath.ac.uk with body
>> >>> "unsubscribe
>> >>> csound"
>> >>>
>> >>>
>> >>>
>> >>
>> >> Send bugs reports to the Sourceforge bug tracker
>> >>
>> >>
>> >> https://sourceforge.net/**tracker/?group_id=81968&atid=**564599
>> >> Discussions of bugs and features can be posted here
>> >> To unsubscribe, send email sympa@lists.bath.ac.uk with body
>> >> "unsubscribe
>> >> csound"
>> >>
>> >>
>> >
>> > Send bugs reports to the Sourceforge bug tracker
>> >             https://sourceforge.net/tracker/?group_id=81968&atid=564599
>> > Discussions of bugs and features can be posted here
>> > To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe
>> > csound"
>> >
>> >
>>
>>
>> Send bugs reports to the Sourceforge bug tracker
>>             https://sourceforge.net/tracker/?group_id=81968&atid=564599
>> Discussions of bugs and features can be posted here
>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe
>> csound"
>>
>



-- 

Oeyvind Brandtsegg
Professor of Music Technology
NTNU
7491 Trondheim
Norway
Cell: +47 92 203 205

http://flyndresang.no/
http://www.partikkelaudio.com/
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