I saw there were some new additions recently, so I figured I'd share a UDO I wrote that I think might also be useful.

in_array takes in a variable (in this case krate) and an irate array and checks the array to see if the provided value is in the array, returning a count of it's appearances in the array.

I mostly use this for tracking flags as a group, for example in cabbage I might have an array listing all the filter modes that should show the resonance control.  When a mode change is detected, if the new mode appears in the array the resonance controls get displayed, otherwise they get hidden.

; search array for value, return number of instances found

opcode in_array,k,ki[]

  kval, iarray[] xin

  klen lenarray iarray

  kptr = 0

  kfound = 0

  while (kptr<klen) do

    if (kval == iarray[kptr]) then

      kfound = kfound+1

    endif

    kptr = kptr+1

  od

  xout kfound

endop

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

No, arrays are not sets in csound.

⁣Sent from TypeApp ​

On Oct 15, 2017, 14:21, at 14:21, Aaron Krister Johnson  wrote:
>I'm wondering if there is a constant time membership operation (using
>hashing) that is available to Csound? Something like a dictionary in
>Python, where membership can be checked without having to check each
>member, a linear-time operation.
>
>-AKJ
>
>
>Aaron Krister Johnson
>http://www.untwelve.org
>
>On Sat, Oct 14, 2017 at 3:40 PM, Kevin Welsh  wrote:
>
>> Ok, cool.  Not sure if that was the right place, or if I did it
>correctly;
>> I don't use github very much... but it should be submitted to the
>csudo
>> repository in the arrays folder.  If not, I probably just need to
>find the
>> right button to initiate a push ;)
>>
>> But any thoughts to adding it as a builtin?  It seems pretty common
>and
>> standard to me.  I know PHP and JS (or was it JQuery?) have it
>builtin.  It
>> adds a simple way to use arrays in a pretty handy way, and I can
>probably
>> provide an example for the docs etc if needed too (tho I'll have to
>trim
>> out some cabbage)
>>
>> On Sat, Oct 14, 2017 at 8:35 AM, Victor Lazzarini
>
>> wrote:
>>
>>> Very useful. Maybe you could add to the UDO database
>>>
>>> Victor Lazzarini
>>> Dean of Arts, Celtic Studies, and Philosophy
>>> Maynooth University
>>> Ireland
>>>
>>> On 14 Oct 2017, at 13:07, Kevin Welsh  wrote:
>>>
>>> I saw there were some new additions recently, so I figured I'd share
>a
>>> UDO I wrote that I think might also be useful.
>>>
>>> in_array takes in a variable (in this case krate) and an irate array
>and
>>> checks the array to see if the provided value is in the array,
>returning a
>>> count of it's appearances in the array.
>>>
>>> I mostly use this for tracking flags as a group, for example in
>cabbage I
>>> might have an array listing all the filter modes that should show
>the
>>> resonance control.  When a mode change is detected, if the new mode
>appears
>>> in the array the resonance controls get displayed, otherwise they
>get
>>> hidden.
>>>
>>> ; search array for value, return number of instances found
>>> opcode in_array,k,ki[]
>>>   kval, iarray[] xin
>>>   klen lenarray iarray
>>>   kptr = 0
>>>   kfound = 0
>>>   while (kptr>>     if (kval == iarray[kptr]) then
>>>       kfound = kfound+1
>>>     endif
>>>     kptr = kptr+1
>>>   od
>>>   xout kfound
>>> endop
>>> 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
>>
>
>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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But Csound arrays aren't sets so we would need a new container, wouldn't
we? Having said that, we easily implemented binary search for Daria
using Victor's C++ interface and std::upper_bound.

Cheers.

On 15/10/17 10:20, Aaron Krister Johnson wrote:
> I'm wondering if there is a constant time membership operation (using
> hashing) that is available to Csound? Something like a dictionary in
> Python, where membership can be checked without having to check each
> member, a linear-time operation.
>
> -AKJ
>
>
> Aaron Krister Johnson
> http://www.untwelve.org
>
> On Sat, Oct 14, 2017 at 3:40 PM, Kevin Welsh  wrote:
>
>> Ok, cool.  Not sure if that was the right place, or if I did it correctly;
>> I don't use github very much... but it should be submitted to the csudo
>> repository in the arrays folder.  If not, I probably just need to find the
>> right button to initiate a push ;)
>>
>> But any thoughts to adding it as a builtin?  It seems pretty common and
>> standard to me.  I know PHP and JS (or was it JQuery?) have it builtin.  It
>> adds a simple way to use arrays in a pretty handy way, and I can probably
>> provide an example for the docs etc if needed too (tho I'll have to trim
>> out some cabbage)
>>
>> On Sat, Oct 14, 2017 at 8:35 AM, Victor Lazzarini 
>> wrote:
>>
>>> Very useful. Maybe you could add to the UDO database
>>>
>>> Victor Lazzarini
>>> Dean of Arts, Celtic Studies, and Philosophy
>>> Maynooth University
>>> Ireland
>>>
>>> On 14 Oct 2017, at 13:07, Kevin Welsh  wrote:
>>>
>>> I saw there were some new additions recently, so I figured I'd share a
>>> UDO I wrote that I think might also be useful.
>>>
>>> in_array takes in a variable (in this case krate) and an irate array and
>>> checks the array to see if the provided value is in the array, returning a
>>> count of it's appearances in the array.
>>>
>>> I mostly use this for tracking flags as a group, for example in cabbage I
>>> might have an array listing all the filter modes that should show the
>>> resonance control.  When a mode change is detected, if the new mode appears
>>> in the array the resonance controls get displayed, otherwise they get
>>> hidden.
>>>
>>> ; search array for value, return number of instances found
>>> opcode in_array,k,ki[]
>>>   kval, iarray[] xin
>>>   klen lenarray iarray
>>>   kptr = 0
>>>   kfound = 0
>>>   while (kptr>>     if (kval == iarray[kptr]) then
>>>       kfound = kfound+1
>>>     endif
>>>     kptr = kptr+1
>>>   od
>>>   xout kfound
>>> endop
>>> 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
>>
> 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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