Hi Mykle, I tried your example with Faust Version 2.5.15 (command line) on a Mac, and it works as expected (faust2caqt used). Nothing strange to point to here.
- Julius On Wed, Feb 28, 2018 at 10:07 AM, Mykle Hansen <[email protected]> wrote: > Hi, > > I’m looking closer at this strange behavior of ba.selectn(). > I’d really like to know if this is expected behavior, > because it looks like a bug to me. (I’m seeing this in > FaustLive version 2.5.17, as installed by MacPorts.) > > Basically, if I have N inputs to selectn(), and I use a > hslider with N possible values to select one of those inputs, > the chosen input is not selected. What happens instead > is hard to characterize. This code demonstrates the problem: > > > import("stdfaust.lib"); > N=8; > process = par(i, N, (i : hbargraph("[%2i]val %i", 0, N))) > : ba.selectn(N, hslider("selector", 0, 0, N-1, 1) ) > : hbargraph("selected val", 0, N) > ; > > > Interestingly, if I use a hslider with N+1 possible values, > everything seems to work as I’d expect. So that’s a workaround, > although it requires the slider to have one meaningless value. > > Can anyone else confirm this? Is this expected behavior? > Or maybe I’m running a bad version of FaustLive? Or I’m > missing some other obvious thing? > > Much thanks, > -mykle- > > >> On Feb 27, 2018, at 4:36 AM, >> [email protected] wrote: >> >> Send Faudiostream-users mailing list submissions to >> [email protected] >> >> To subscribe or unsubscribe via the World Wide Web, visit >> https://lists.sourceforge.net/lists/listinfo/faudiostream-users >> or, via email, send a message with subject or body 'help' to >> [email protected] >> >> You can reach the person managing the list at >> [email protected] >> >> When replying, please edit your Subject line so it is more specific >> than "Re: Contents of Faudiostream-users digest..." >> Today's Topics: >> >> 1. Re: compiler hangs on this program? (Mykle Hansen) >> 2. Re: FAUST Compiler for GPGPU? ([email protected]) >> >> From: Mykle Hansen <[email protected]> >> Subject: Re: [Faudiostream-users] compiler hangs on this program? >> Date: February 26, 2018 at 3:59:32 PM PST >> To: Julius Smith <[email protected]> >> Cc: Oleg Nesterov <[email protected]>, faudiostream-users >> <[email protected]> >> >> >>> On Feb 23, 2018, at 12:17 PM, Julius Smith <[email protected]> wrote: >>> >>> Hi Mykle, >>> >>> Yes, iFFT takes spectral-bin signals in parallel. Right now they all >>> run at the full audio sampling rate, but later we should be able to >>> downsample as is typical. >> >> Thanks. Clearly I have wandered in over my head, math-wise. >> But after reading all weekend, I think I now (sort of) understand >> the difference between the real and the complex FFT. Or so I’d like >> to prove to myself, by making this algorithm work in Faust. =) >> >> Nevertheless, I’m still struggling. I expect this to work, and it doesn’t: >> >> import("stdfaust.lib”); >> process = no.noise : an.rtocv(N) : an.fft(N) : par(f, N, (/(denom(f)^beta), >> _ )) : an.ifft(N) : ba.selectn(N*2, 0) >> with { >> N=8; >> hN = N/2; >> beta = hslider("beta", 1, 0, 3, 0.01); >> // Convert par() index to appropriate coefficient for pos & neg freqs >> produced by complex fft >> // For instance: 0 1 2 3 4 5 6 7 -> 4 3 2 1 1 2 3 4 >> denom(f) = ba.if(f < hN, hN-f, f+1 - hN); >> }; >> >> >> And while trying to debug that myself, I hit an even bigger snag >> with selectn(). The code below seems pretty straightforward, >> but it does not work at all like I expect, and I haven’t a clue why not: >> >> >> import("stdfaust.lib"); >> process = par(i, N, (2*i, 2*i+1)) : par(i, 16, hbargraph("[%2i]value %i", 0, >> 20)) >> : ba.selectn(16, pick) : hbargraph("selected value", 0, 20) >> with { >> N=8; >> pick = hslider(“pick a value", 0, 0, 15, 1); >> }; >> >> >> (Possibly this is because selectn() expects an integer? >> The SVG shows me that the hslider is producing floats, >> even though there’s not a decimal point in this program.) >> >>> Note that for 1/f noise there is a spectral_tilt function in >>> filters.lib that will provide a 1/f filter for white noise as a >>> special case. More generally it can provide 1/f^alpha over the entire >>> audio band, for any alpha, to any desired degree of accuracy. >>> Moreover, alpha can be safely modulated over time as that only moves >>> the zeros of the filter. >> >> Thank you! For any sort of practical use, I’m sure that would be ideal. >> At the moment I’m just researching the various different approaches to >> synthesizing 1/f noise. I expect this one to be the slowest. >> I wanted to see if I could code in Faust, as a learning exercise. >> (Boy, am I learning …) >> >> -mykle- >> >> >> >> >> >> >> >> From: [email protected] >> Subject: Re: [Faudiostream-users] FAUST Compiler for GPGPU? >> Date: February 27, 2018 at 12:35:59 AM PST >> To: Christoph Kuhr <[email protected]> >> Cc: [email protected], Thomas Hofmann >> <[email protected]> >> >> >> >>> Le 27 févr. 2018 à 09:13, Christoph Kuhr <[email protected]> a écrit : >>> >>> Hey, >>> >>> we are trying to implement FAUST in our online environment untill CfP. >>> Chances are good that we could submit some proof of concept. >> >> That would be great yes ! Is your « online environment » visible somewhere? >> >>> So, we will try to attend the IFC18. Even if it does not work out, I may be >>> able to drop by. >>> >>> However, I will be present at the LAC 2018. >>> >>> >>> BR, >>> Ck >>> >> >> OK. >> >> Stéphane >> >> >> >> ------------------------------------------------------------------------------ >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, Slashdot.org! >> http://sdm.link/slashdot_______________________________________________ >> Faudiostream-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/faudiostream-users > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Faudiostream-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/faudiostream-users -- Julius O. Smith III <[email protected]> Professor of Music and, by courtesy, Electrical Engineering CCRMA, Stanford University http://ccrma.stanford.edu/~jos/ ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Faudiostream-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/faudiostream-users
