Hi,

I'm trying to limit the values in an array to a specific range (0 to 1 in my case).

I thought maybe I could use maparray, and since I can only use functions with one argument I thought I could try making a UDO of limit with preset values for the uper and lower limit.

It seems maparray won't accept UDOs as functions.

Is there another way to limit the range of values in an array (and otherwise not changing the values inside the allowed range.

Here's my UDO based attempt, which gives

INIT ERROR in instr 2: lim not found

kArr1   maparray.k      kArr    "lim"

***

opcode lim,k,k

        k1 xin 

        xout limit(k1,0,1)

        endop

        

instr 2

kArr[] fillarray .2,.4,.6,.8,1.0,1.2,1.4,1.6,1.8,2.0

kArr1[] maparray kArr, "lim"

kmax maxarray kArr1

printk2 kmax

endin

***

I also tried using "tanh" which sort of could work, but of course it warps the values inside the allowed range and I would prefer to have the option of keeping them linear up to the selected limit.

Is there another approach that I could use?

Any formulas based on the allowed operations on arrays that could make the trick?

--

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

http://www.partikkelaudio.com/
http://crossadaptive.hf.ntnu.no
http://gdsp.hf.ntnu.no/
http://soundcloud.com/brandtsegg
http://flyndresang.no/
http://soundcloud.com/t-emp
 

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Don't UDOs pass by value? Wouldn't that be copying the entire array
twice with that strategy?

On 20/04/17 06:15, Rory Walsh wrote:
> Can you not create a UDO that simply takes one array as input and outputs
> another, limiting values between 0 and 1?
>
> On 20 April 2017 at 07:14, Oeyvind Brandtsegg <oyvind.brandtsegg@ntnu.no>
> wrote:
>
>> Hi,
>> I'm trying to limit the values in an array to a specific range (0 to 1 in
>> my case).
>> I thought maybe I could use maparray, and since I can only use functions
>> with one argument I thought I could try making a UDO of limit with preset
>> values for the uper and lower limit.
>> It seems maparray won't accept UDOs as functions.
>> Is there another way to limit the range of values in an array (and
>> otherwise not changing the values inside the allowed range.
>>
>> Here's my UDO based attempt, which gives
>> INIT ERROR in instr 2: lim not found
>> kArr1   maparray.k      kArr    "lim"
>>
>> ***
>> opcode lim,k,k
>>         k1 xin
>>         xout limit(k1,0,1)
>>         endop
>>
>> instr 2
>> kArr[] fillarray .2,.4,.6,.8,1.0,1.2,1.4,1.6,1.8,2.0
>> kArr1[] maparray kArr, "lim"
>> kmax maxarray kArr1
>> printk2 kmax
>> endin
>> ***
>>
>> I also tried using "tanh" which sort of could work, but of course it warps
>> the values inside the allowed range and I would prefer to have the option
>> of keeping them linear up to the selected limit.
>>
>> Is there another approach that I could use?
>> Any formulas based on the allowed operations on arrays that could make the
>> trick?
>>
>> --
>>
>> Oeyvind Brandtsegg
>> Professor of Music Technology
>> NTNU
>> 7491 Trondheim
>> Norway
>> Cell: +47 92 203 205
>>
>> http://www.partikkelaudio.com/
>> http://crossadaptive.hf.ntnu.no
>> http://gdsp.hf.ntnu.no/
>> http://soundcloud.com/brandtsegg
>> http://flyndresang.no/
>> http://soundcloud.com/t-emp
>>
>> 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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