Hey hey,
to prefix: I know that bpf should theoretically do this, but I wondered if 
there is an even more straightforward alternative.

I have an input signal kInput and I want to generate kOutput. It should happen 
in steps:
if kInput >=0 < ix1: kOutput y1
if kInput >= iX1 < iX2: kOutput y2
...
if kInput >= iXn: kOUtput = yn

This could be done with if and elseif statements or with bpf using two points 
at every iX point. Though with bpf, I think, these points should have strict 
ordering. A minimal issue though.

Any other ideas? Something in the Csound universe I missed?

Best wishes,

Jeanette

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Hi Eduardo,
many thanks for your reply. This does look elegant and efficient enough. bpf 
absolutely rocks! Best utility in the past few years!

Best wishes,

Jeanette

Eduardo Moguillansky, Mar 19 2026:

> Notice that with bpf x points can be repeated for this exact purpose
>
> instr 1
>  kx linseg 1, p3, 5
>  ky bpf kx, 1, 10, 2, 10, 2, 20, 4, 20, 4, 40
>  if metro(20) == 1 then
>    println "x: %f, y: %f", kx, ky
>  endif
> endin
>
>
> On Wed, Mar 18, 2026 at 10:35 PM Jeanette C. <
> 000015cdd0ffa6cd-dmarc-request@listserv.heanet.ie> wrote:
>
>> Hey hey,
>> to prefix: I know that bpf should theoretically do this, but I wondered if
>> there is an even more straightforward alternative.
>>
>> I have an input signal kInput and I want to generate kOutput. It should
>> happen
>> in steps:
>> if kInput >=0 < ix1: kOutput y1
>> if kInput >= iX1 < iX2: kOutput y2
>> ...
>> if kInput >= iXn: kOUtput = yn
>>
>> This could be done with if and elseif statements or with bpf using two
>> points
>> at every iX point. Though with bpf, I think, these points should have
>> strict
>> ordering. A minimal issue though.
>>
>> Any other ideas? Something in the Csound universe I missed?
>>
>> Best wishes,
>>
>> Jeanette
>>
>> --
>>   * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g
>>   * GitHub: https://github.com/jeanette-c
>>
>> 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
>

--
  * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g
  * GitHub: https://github.com/jeanette-c

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