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1:22 AM
@MichaelE2 do you have the most recent 12.1.1? I think the first version shipped had this bug and they fixed it right away.
 
@CarlLange the plot shows the number of questions per week throughout the pandemic. It looks like the decline is mostly a summer thing, if we suppose that we have more users here from the northern hemisphere than the southern.
@CarlLange Sounds nice!
 
1:57 AM
@JasonB. "12.1.1 for Mac OS X x86 (64-bit) (June 9, 2020)"
 
 
3 hours later…
5:09 AM
@kirkus I'm not quite certain why or how you would assume it to generate conditions (and ar and aa are basically just ignored in this case anyway).
 
 
5 hours later…
10:07 AM
@C.E. Interesting, I wonder what that's like compared to last year. It seems much quieter but that might just be because I filter out a lot of tags I know nothing about.
@C.E. Yeah! It's only a temporary thing, more like a sabbatical than anything else, but it's really exciting to have so much time!
 
10:36 AM
@CarlLange That's the statistics from the time that the public beta went live until today. I also think it's been slow, but as you say, one's perception depends a lot on whether one finds the questions being asked interesting...
 
 
2 hours later…
12:29 PM
the probability of rr+ar should be 0.02, but that code above outputs:

0.0198 ! 2
0.0199 True

So my guess is I'm not understanding something correctly.
@kirma but you'll get a different answer if you remove ar and aa.
 
@kirkus I get the same answer for both. Anyway, I wonder if you should actually be using Expectation instead of Probability, or modify the predicate (the first argument) - now it is definitely not a predicate.
 
1:09 PM
@JasonB. Installing the June 19 version fixed it (or reset it). Thanks!
 
1:51 PM
This seems kinda sad:
N[FresnelS[8 + 1*^-28], 32] - FresnelS[N[8 + 1*^-28, 32]]
(*  -0.0005  *)
I'd put up a Q&A on it, but I'm not sure it's that interesting (except to people who use the Fresnel functions or possibly Integrate). I don't really like oh-look-at-Mma-mess-up-again questions. I suppose I could ask which one of the two is closer to the correct value. You could say N[f[x], prec] is supposed to be better, but it still needs verification.
 
 
1 hour later…
2:59 PM
@MichaelE2 that does look like numerical instability for FresnelS[].
You get the same spotty evaluation with With[{x = N[8 + 1*^-28, 32]}, 1/2 - FresnelF[x] Cos[Pi x^2/2] - FresnelG[x] Sin[Pi x^2/2]].
I at least think it's worth a bug report.
 
@J.M.'stechnicaldifficulties I saw you had logged in so I was just in the process of writing a Q, now posted on the main site.
If you have some insight, please answer. I have some of my own, well, except I'm not sure it's really insight (into the truth, that is).
Got to go to a meeting now. Good to see you on the site. Hope things are well.
 
It could be better here, but I'm doing pretty OK considering the circumstances. :) Nice to see you too, @MichaelE2!
 

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