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Szabolcs
Szabolcs
10:20 AM
There are multiple functions which keep doing something for as long as a condition is True (*While functions). They interpret anything that is not True as False (even if it is not a truth value, they effectively use TrueQ)
Is anyone aware of a function that keeps doing something for as long as a condition is False?
Is anyone aware of a function which reports an error when the input is not a truth value, instead of just pulling a TrueQ?
 
 
2 hours later…
Carl Lange
Carl Lange
12:08 PM
@kirkus Yep, same here
Works in VLC and so on though, just not Quicktime
 
kirkus
kirkus
@CarlLange yep, noticed that too. Since the new functionality uses ffmpeg, I wonder if it's trac.ffmpeg.org/wiki/Encode/H.264#Encodingfordumbplayers
 
kirkus
kirkus
12:38 PM
ah, ok, looks like the default VideoEncoding used is "MPEG2VIDEO". Changing it to "H264-AVF" produces a file that works on QuickTime as well.
 
 
3 hours later…
Szabolcs
Szabolcs
3:40 PM
IGraph/M 0.3.115 is out. Some testing would be appreciated, especially on Windows or Linux. Quick version: install it, load it, see if IGVersion[] works. Then let me know your OS, OS version, M version. Involved version: run the test suite.
@kirkus ^ :-)
 
kirkus
kirkus
4:22 PM
Windows 10 [Version 10.0.18363.720].
12.1.0 for Microsoft Windows (64-bit) (March 14, 2020).
"IGraph/M 0.3.115 (March 28, 2020)
igraph 0.9.0-pre+4b6e4215 (Mar 28 2020)
Microsoft Windows (64-bit)
Tests run: 2192
Passed: 2192
Failed: 0
Messages: 0
same result on macOS 10.15.4
 
Lukas Lang
Lukas Lang
4:43 PM
Does anyone know why the following evaluates the Dynamic twice, and how to prevent that from happening? 
Graphics[
 Dynamic[
  Refresh[Echo@CurrentValue["Color"];, None]
   {}
  ]
 ]
 
 
4 hours later…
Meta
Meta
8:15 PM
0
Q: newsletter is not received

UnbelievableI do not know whether we should ask this question here, so sorry if it is not relevant. But this is a problem for me. I have received Mathematica Stack Exchange Newsletter on Tuesday every week. But the last week I did not receive it. I wanted to register for it again. But this option is not on...

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