I think you can't use changed as if it were a function. It has state, so you can't use it in a loop as if it were stateless. In your code I expect it to compare against the previous array slot, then it would show a change every time you go from a set slot to an unset one and viceversa.

You would need to have an array with the previous states and compare to that. An UDO can be written for this.

Victor Lazzarini

Dean of Arts, Celtic Studies, and Philosophy

Maynooth University

Ireland

On 21 Feb 2016, at 13:16, Rory Walsh <rorywalsh@EAR.IE> wrote:

This csd is not producing the output I expect. I first create a global k-array. I then set a list of channels to 0 and initialise all values in said array to 0. Then in instr3 I query the current value of each channels, and pass it to my array. I then check the value of each element in the array to see if it has changed. If an element has changed since the last kcycle we should get a single message printed to the console output, but instead we get a constant stream of messages. Once I set a channel to 1, it seems to continuously trigger the changed opcode? Or am I reading this wrong?  

instr 1: sets channels and initialises array

instr 3: reads values from channels and looks for changes

instr 2: changes the value of channel 'note1' from 0 to 1

<CsoundSynthesizer>

<CsOptions>

-+rtaudio=jack -odac -b4096

</CsOptions>

<CsInstruments>

gkLabels[] init 144

instr 1; set all channels to 0 

    iCnt init 0

    until iCnt > 144 do

        S1 sprintf "note%d", iCnt+1

        chnset 0, S1

        gkLabels[iCnt] = 0

        iCnt=iCnt+1

    enduntil

endin

instr 2; change value of channel 'step1'

    chnset 1, "note1" 

endin

instr 3; 

kIndex = 0

until kIndex==144 do

   gkLabels[kIndex] chnget sprintfk("note%d", kIndex+1)

kTrig changed gkLabels[kIndex] 

if kTrig==1 then

printks "Index of channel that has changed:%d\n", .1, kIndex

endif

   kIndex +=1 

enduntil

endin

</CsInstruments>

<CsScore>

i1 0 1

i3 1 30

i2 4 .1

</CsScore>

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I tested here and the problem is with your until loop, it should be:

until kIndex >= 144 do

On Sun, Feb 21, 2016 at 12:45 PM, Rory Walsh <rorywalsh@ear.ie> wrote:
> Even with ksmps = 1 this still doesn't work. But I'm guessing there is a
> good reason?
>
> On 21 February 2016 at 15:57, Rory Walsh <rorywalsh@ear.ie> wrote:
>>
>> Should the following code not work then? At the end of each k-cycle I
>> write the values of gkLabels1 to gkLabels2. Then on the next k-cycle I
>> compare the two arrays. Still not notification about any changes..
>>
>> <CsoundSynthesizer>
>> <CsOptions>
>> -+rtaudio=jack -odac -b4096
>> </CsOptions>
>> <CsInstruments>
>>
>> gkLabels1[] init 144
>> gkLabels2[] init 144
>>
>> instr 1; set all channels to 0
>>     iCnt init 0
>>     until iCnt > 144 do
>>         S1 sprintf "note%d", iCnt+1
>>         chnset 0, S1
>>         gkLabels1[iCnt] = 0
>>         gkLabels2[iCnt] = 0
>>         iCnt=iCnt+1
>>     enduntil
>> endin
>>
>> instr 2; change value of channel 'step1'
>>     chnset p4, "note1"
>>     turnoff
>> endin
>>
>> instr 3; pass values from channels into array
>>
>> kIndex = 0
>> until kIndex<144 do
>>    gkLabels1[kIndex] chnget sprintfk("note%d", kIndex+1)
>>    if gkLabels1[kIndex] != gkLabels2[kIndex] then
>>     printks "Index of channel that has changed:%d\n", 0, kIndex
>>    endif
>>    kIndex = kIndex+1
>> enduntil
>>
>> ;assign values to gkLabels2
>> gkLabels2[] = gkLabels1
>> endin
>>
>> </CsInstruments>
>> <CsScore>
>> i1 0 1
>> i3 1 30
>> i2 4 .1 1
>> i2 6 .1 0
>> </CsScore>
>>
>> On 21 February 2016 at 15:11, Rory Walsh <rorywalsh@ear.ie> wrote:
>>>
>>> Thanks for your reply Victor. I'll rework it.
>>>
>>> On 21 Feb 2016 13:48, "Victor Lazzarini" <Victor.Lazzarini@nuim.ie>
>>> wrote:
>>>>
>>>> I think you can't use changed as if it were a function. It has state, so
>>>> you can't use it in a loop as if it were stateless. In your code I expect it
>>>> to compare against the previous array slot, then it would show a change
>>>> every time you go from a set slot to an unset one and viceversa.
>>>>
>>>> You would need to have an array with the previous states and compare to
>>>> that. An UDO can be written for this.
>>>>
>>>> Victor Lazzarini
>>>> Dean of Arts, Celtic Studies, and Philosophy
>>>> Maynooth University
>>>> Ireland
>>>>
>>>> On 21 Feb 2016, at 13:16, Rory Walsh <rorywalsh@EAR.IE> wrote:
>>>>
>>>> This csd is not producing the output I expect. I first create a global
>>>> k-array. I then set a list of channels to 0 and initialise all values in
>>>> said array to 0. Then in instr3 I query the current value of each channels,
>>>> and pass it to my array. I then check the value of each element in the array
>>>> to see if it has changed. If an element has changed since the last kcycle we
>>>> should get a single message printed to the console output, but instead we
>>>> get a constant stream of messages. Once I set a channel to 1, it seems to
>>>> continuously trigger the changed opcode? Or am I reading this wrong?
>>>>
>>>> instr 1: sets channels and initialises array
>>>> instr 3: reads values from channels and looks for changes
>>>> instr 2: changes the value of channel 'note1' from 0 to 1
>>>>
>>>> <CsoundSynthesizer>
>>>> <CsOptions>
>>>> -+rtaudio=jack -odac -b4096
>>>> </CsOptions>
>>>> <CsInstruments>
>>>>
>>>> gkLabels[] init 144
>>>>
>>>> instr 1; set all channels to 0
>>>>     iCnt init 0
>>>>     until iCnt > 144 do
>>>>         S1 sprintf "note%d", iCnt+1
>>>>         chnset 0, S1
>>>>         gkLabels[iCnt] = 0
>>>>         iCnt=iCnt+1
>>>>     enduntil
>>>> endin
>>>>
>>>> instr 2; change value of channel 'step1'
>>>>     chnset 1, "note1"
>>>> endin
>>>>
>>>> instr 3;
>>>> kIndex = 0
>>>> until kIndex==144 do
>>>>    gkLabels[kIndex] chnget sprintfk("note%d", kIndex+1)
>>>> kTrig changed gkLabels[kIndex]
>>>> if kTrig==1 then
>>>> printks "Index of channel that has changed:%d\n", .1, kIndex
>>>> endif
>>>>    kIndex +=1
>>>> enduntil
>>>> endin
>>>>
>>>> </CsInstruments>
>>>> <CsScore>
>>>> i1 0 1
>>>> i3 1 30
>>>> i2 4 .1
>>>> </CsScore>
>>>> Csound mailing list Csound@listserv.heanet.ie
>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to
>>>> https://github.com/csound/csound/issues Discussions of bugs and features can
>>>> be posted here
>>>>
>>>> Csound mailing list Csound@listserv.heanet.ie
>>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to
>>>> https://github.com/csound/csound/issues Discussions of bugs and features can
>>>> be posted here
>>
>>
>
> Csound mailing list Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to
> https://github.com/csound/csound/issues Discussions of bugs and features can
> be posted here

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