>
> Following this idea, would it be good to have guards in tables and delays to
> avoid seg_fault 11 when indexes are weird values such as NAN? INF doesn't
> seem to be a problem for delay values in delay lines. For example:
>
> import("stdfaust.lib");
> process = de.fdelay(16, del, no.noise), safefdel(16, del, no.noise), del
> with {
> del = log(no.noise);
> };
> safefdel(s, d, x) = de.fdelay(s, delay, x)
> with {
> delay = ba.if(ma.isnan(d), _, d) ~ _;
> };
>
> channel 1, channel 2, channel 3
> 5.7485885944909363e-06, 5.7485885944909363e-06, -12.066556195113364
> nan, -0.34484595169538912, nan
> nan, -0.6951856770064615, nan
> nan, -0.3250393664115292, nan
> 0.10676848381141596, 0.10676848381141596, -2.2370924914039843
> nan, -0.48342555318187247, nan
> 0.2113922806105179, 0.21139228061051793, -0.71403105730027505
> nan, -0.14381783171867368, nan
> nan, -0.56355247609807113, nan
> 0.25666705810309715, 0.25666705810309715, -1.3599755277266783
>
> I'm not suggesting to change the delay lines implementations but to add new
> ones. Perhaps also adding nan-safe math could be good.
>
>
> - « As far as I'm concerned, Faust should be double precision by default. :-)
> from Dario » I know that, I guess you should even write « Faust should be
> double precision running at 96kHz by default ((-; ». Well AFAICS floats are
> sufficient for most of standard cases to stay the default, and Dario
> especially for you (…), I’m working on adding double support in the
> WebAssembly layer to be able to have a « float/double » choice at some point
> in the faust Web IDE.
>
Since this is a recurring question and some partial answers have been given,
I've just added a « Produced NaN or INFINITY values and table access » section
in the FAQ here:
https://github.com/grame-cncm/faustdoc/blob/master/mkdocs/docs/manual/faq.md
And since I’m not a mathematician nor a floating-point computation expert, feel
free people to propose corrections or comments on this section.
Stéphane
PS : I want to be loved by you, just you, and nobody else but you… ((-;
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