Hi,

I have this nice and juicy opcode that simply has the function of reading some values in an array and get them according to a phasor (embodying the tempo of livecoding).
Here it is:

	opcode	pump, k, kk[]
	kdiv, kvals[] xin

kdiv	init i(kdiv)

klen	lenarray kvals

kph		chnget	"PHASOR_IN_ANOTHER_INSTR"
kph		= int(((kph * kdiv) % 1) * klen)

ktrig	changed2 kph

if ktrig == 1 then
	kout = kvals[kph]	
endif
	
	xout kout
	endop

The very big problem is that sometimes kout doesn't get the values I need and csound do not appreciate it. Typically I use this for iterating some GEN tables (tuning system or envelope) and here if there's not a GEN value csound is stuck.

I think it's due to a lack of initialisation, but I tried everything: ktrig init -1, kph init 0, kout init kvals[0] (in this last one Csound gets super nervous). I need to tell csound to get the first value in the init state. How can I do it?
Thanks ❤️

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Maybe the issue is that no matter how you initialiase kph, you are setting it immediately before you use it, so any initialisation is moot.

Maybe reordering the operations, that is setting kph after you use it, might help.

Prof. Victor Lazzarini
Maynooth University
Ireland

> On 4 Feb 2023, at 00:41, coooooooordeliaa <00000c641a512f08-dmarc-request@listserv.heanet.ie> 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.
> 
> Hi,
> 
> I have this nice and juicy opcode that simply has the function of reading some values in an array and get them according to a phasor (embodying the tempo of livecoding).
> Here it is:
> 
>        opcode  pump, k, kk[]
>        kdiv, kvals[] xin
> 
> kdiv    init i(kdiv)
> 
> klen    lenarray kvals
> 
> kph             chnget  "PHASOR_IN_ANOTHER_INSTR"
> kph             = int(((kph * kdiv) % 1) * klen)
> 
> ktrig   changed2 kph
> 
> if ktrig == 1 then
>        kout = kvals[kph]
> endif
> 
>        xout kout
>        endop
> 
> The very big problem is that sometimes kout doesn't get the values I need and csound do not appreciate it. Typically I use this for iterating some GEN tables (tuning system or envelope) and here if there's not a GEN value csound is stuck.
> 
> I think it's due to a lack of initialisation, but I tried everything: ktrig init -1, kph init 0, kout init kvals[0] (in this last one Csound gets super nervous). I need to tell csound to get the first value in the init state. How can I do it?
> Thanks ❤️
> 
> Csound mailing list
> Csound@listserv.heanet.ie
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Mh.. Thank you Victor, but TBH i’m not sure I understood what u were telling.
Anyway, this is the solution to add inside the code in order to “simulate” a first step init to get the first value of the array:

kinit init 1
if kinit == 1 then
	kinit = 0
	kout = kvals[0]
endif

Thanks to Johann Philippe,
best.



> On 4 Feb 2023, at 11:02, Victor Lazzarini  wrote:
> 
> Maybe the issue is that no matter how you initialiase kph, you are setting it immediately before you use it, so any initialisation is moot.
> 
> Maybe reordering the operations, that is setting kph after you use it, might help.
> 
> Prof. Victor Lazzarini
> Maynooth University
> Ireland
> 
>> On 4 Feb 2023, at 00:41, coooooooordeliaa <00000c641a512f08-dmarc-request@listserv.heanet.ie> 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.
>> 
>> Hi,
>> 
>> I have this nice and juicy opcode that simply has the function of reading some values in an array and get them according to a phasor (embodying the tempo of livecoding).
>> Here it is:
>> 
>>       opcode  pump, k, kk[]
>>       kdiv, kvals[] xin
>> 
>> kdiv    init i(kdiv)
>> 
>> klen    lenarray kvals
>> 
>> kph             chnget  "PHASOR_IN_ANOTHER_INSTR"
>> kph             = int(((kph * kdiv) % 1) * klen)
>> 
>> ktrig   changed2 kph
>> 
>> if ktrig == 1 then
>>       kout = kvals[kph]
>> endif
>> 
>>       xout kout
>>       endop
>> 
>> The very big problem is that sometimes kout doesn't get the values I need and csound do not appreciate it. Typically I use this for iterating some GEN tables (tuning system or envelope) and here if there's not a GEN value csound is stuck.
>> 
>> I think it's due to a lack of initialisation, but I tried everything: ktrig init -1, kph init 0, kout init kvals[0] (in this last one Csound gets super nervous). I need to tell csound to get the first value in the init state. How can I do it?
>> Thanks ❤️
>> 
>> Csound mailing list
>> Csound@listserv.heanet.ie
>> https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Flistserv.heanet.ie%2Fcgi-bin%2Fwa%3FA0%3DCSOUND&data=05%7C01%7CVictor.Lazzarini%40mu.ie%7C163cc450c40d40bc4b7c08db0648810b%7C1454f5ccbb354685bbd98621fd8055c9%7C0%7C0%7C638110680697707723%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=5ZEqYZ0s7QMYbVFQQZlkQ4GbTpGBJnPFbYIm5MSMJ%2FY%3D&reserved=0
>> Send bugs reports to
>>       https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fcsound%2Fcsound%2Fissues&data=05%7C01%7CVictor.Lazzarini%40mu.ie%7C163cc450c40d40bc4b7c08db0648810b%7C1454f5ccbb354685bbd98621fd8055c9%7C0%7C0%7C638110680697707723%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=tKou%2F4urV7d1%2BI2as7ZkJMT9QS8I4B6ksjEcSrURzS8%3D&reserved=0
>> Discussions of bugs and features can be posted here
> 
> Csound mailing list
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> Send bugs reports to
>        https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here

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Here’s what I meant with the other code showing just the relevant lines


kph             = int(((kph * kdiv) % 1) * klen)  // <—— this assigns to kph

kout = kvals[kph]      // <— this reads kph


No matter where you put a line 

kph init 0

initialising kph, it won’t make a difference. This is because the first lines above
run *only* at perf time and the initialisaiton *only* at init time.

So the initial value of kph will always be overwritten before it is used. If you
reverse the lines, then you have a chance to use the initial value before
it gets changed.

In any case, it is normal practice to update the state of a phase integrator after
you use it. So you start with an initial value, use it, then increment it.

========================
Prof. Victor Lazzarini
Maynooth University
Ireland

> On 4 Feb 2023, at 10:51, Jacopo Greco d'Alceo <00000c641a512f08-dmarc-request@LISTSERV.HEANET.IE> wrote:
> 
> Mh.. Thank you Victor, but TBH i’m not sure I understood what u were telling.
> Anyway, this is the solution to add inside the code in order to “simulate” a first step init to get the first value of the array:
> 
> kinit init 1
> if kinit == 1 then
> 	kinit = 0
> 	kout = kvals[0]
> endif
> 
> Thanks to Johann Philippe,
> best.
> 
> 
> 
>> On 4 Feb 2023, at 11:02, Victor Lazzarini  wrote:
>> 
>> Maybe the issue is that no matter how you initialiase kph, you are setting it immediately before you use it, so any initialisation is moot.
>> 
>> Maybe reordering the operations, that is setting kph after you use it, might help.
>> 
>> Prof. Victor Lazzarini
>> Maynooth University
>> Ireland
>> 
>>> On 4 Feb 2023, at 00:41, coooooooordeliaa <00000c641a512f08-dmarc-request@listserv.heanet.ie> 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.
>>> 
>>> Hi,
>>> 
>>> I have this nice and juicy opcode that simply has the function of reading some values in an array and get them according to a phasor (embodying the tempo of livecoding).
>>> Here it is:
>>> 
>>>      opcode  pump, k, kk[]
>>>      kdiv, kvals[] xin
>>> 
>>> kdiv    init i(kdiv)
>>> 
>>> klen    lenarray kvals
>>> 
>>> kph             chnget  "PHASOR_IN_ANOTHER_INSTR"
>>> kph             = int(((kph * kdiv) % 1) * klen)
>>> 
>>> ktrig   changed2 kph
>>> 
>>> if ktrig == 1 then
>>>      kout = kvals[kph]
>>> endif
>>> 
>>>      xout kout
>>>      endop
>>> 
>>> The very big problem is that sometimes kout doesn't get the values I need and csound do not appreciate it. Typically I use this for iterating some GEN tables (tuning system or envelope) and here if there's not a GEN value csound is stuck.
>>> 
>>> I think it's due to a lack of initialisation, but I tried everything: ktrig init -1, kph init 0, kout init kvals[0] (in this last one Csound gets super nervous). I need to tell csound to get the first value in the init state. How can I do it?
>>> Thanks ❤️
>>> 
>>> Csound mailing list
>>> Csound@listserv.heanet.ie
>>> https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Flistserv.heanet.ie%2Fcgi-bin%2Fwa%3FA0%3DCSOUND&data=05%7C01%7CVictor.Lazzarini%40mu.ie%7C3c599302c44c43e68cc408db069dd4b9%7C1454f5ccbb354685bbd98621fd8055c9%7C0%7C0%7C638111047202595902%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=RxodTYUiyaFzUK6RvjaKsqs67tV0iQySJRy3Ti%2BDZag%3D&reserved=0
>>> Send bugs reports to
>>>      https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fcsound%2Fcsound%2Fissues&data=05%7C01%7CVictor.Lazzarini%40mu.ie%7C3c599302c44c43e68cc408db069dd4b9%7C1454f5ccbb354685bbd98621fd8055c9%7C0%7C0%7C638111047202595902%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=cK%2FnaijfYg%2BY%2FWZNeV%2BaOQQukgyErpdCER8DzLfH4OU%3D&reserved=0
>>> Discussions of bugs and features can be posted here
>> 
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>> Discussions of bugs and features can be posted here
> 
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