[PD] fexpr~ block limitations - bug

[Alexandre Torres Porres]

sure, count me in for testing it, my pleasure ;)

I'm on a mac os - yosemite and mavericks

cheers

2015-09-08 21:22 GMT-03:00 Shahrokh Yadegari <sdy at ucsd.edu>:

> Hi Alexandre,
>
> I recall that I fixed this bug a while back so I am surprised that I see
> it again.
>
> In any case your email is timely as I just started looking at the bugs and
> hope to be submitting new sources soon.
>
> Would you care to be my alpha tester? If so, what environment are you on?
> (mac, linux, sorry I cannot deal with windows)
>
> cheers,
> Shahrokh
>
>
> On Tue, Sep 8, 2015 at 1:12 PM, Alexandre Torres Porres <porres at gmail.com>
> wrote:
>
>> So, as it seems, I just found that there's an issue with the way [fexpr~]
>> abbreviates the formulas and the way it behaves.
>>
>> If you use it like this [fexpr~ ($x + $x[-1] + $x[-2] + $x[-3]) * 0.25]
>> by supressing the outlet number, it won't check back on previous block
>> sample values.
>>
>> but if you do this [fexpr~ ($x1 + $x1[-1] + $x1[-2] + $x1[-3]) * 0.25] it
>> will!
>>
>> check attached patch
>>
>> Anyway, still seems like a bug to me one way or another that needs to be
>> fixed. And, as long as we're on the subject, how's the work on the previous
>> bug reports?
>>
>> Thanks
>>
>> 2015-09-08 1:47 GMT-03:00 Alexandre Torres Porres <porres at gmail.com>:
>>
>>> Hi Shahrokh and Pd list
>>>
>>> I've been testing fexpr~ and it seems it won't get the previous samples
>>> from the previous block.
>>>
>>> For example, a simple mean filter like this:
>>>
>>> [fexpr~ ($x + $x[-1]) * 0.5]
>>>
>>> will not work for the first sample of the block, because it won't get
>>> the last sample from the previous block.
>>>
>>> So, I know that in practice it doesn't compromise much, it's just one
>>> sample, but in an 16 point average filter this becomes more of a concern.
>>> One way or another, even for just one sample, I consider this problematic
>>> and a bug, as it should always be able to address previous samples.
>>>
>>> Am I right?
>>>
>>> thanks
>>>
>>
>>
>
>
> --
> Shahrokh Yadegari
> Professor of Composition and Sound Design,
> Theatre and Dance Department
> University of California, San Diego
> Director, Initiative for Digital Exploration of Arts and Science, (IDEAS)
> California Institute for Telecommunications and Information Technologies
> (Calit2)
> Email: sdy at ucsd.edu
> Web: http://yadegari.org
> Tel: (858) 822-4113
> Fax: (858) 534-1080
>
>
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