Wikipedia:Reference desk/Archives/Computing/2017 December 5

= December 5 =

GoogleBot and such.
I had a domain name submitted to Google.

Then, I created an add-on domain. It does not link to any page, nor does any page link to it. Within days GoogleBot comes and finds it and such. How did GoogleBot and such find it?

Is it possible to look up a domain, and find out all the add-on domains? And vice versa? (By add-on domain, I do not mean subdomain, as in subdomain.domain.com). And if I want Google to stop logging it, I can just upload a blank robots.txt, or do I have to put something in it? Thanks. 12.239.13.143 (talk) 20:16, 5 December 2017 (UTC).


 * I think "Add-on domain" is just marketing jargon. It usually refers to a special deal where you can host more than one domain without buying a separate hosting package.
 * You're really asking if google is aware of newly registered domains.
 * Answer : Yes. Registering domains is public.  You can actually get up-to-date lists of all registered domains.
 * Here is a site that tracks recently registered domains.
 * Here is a site that will sell you a giant list of all domains.
 * ApLundell (talk) 23:12, 5 December 2017 (UTC)


 * Okay, thanks. This must not have been the case 10 years ago? I wanna say 10 years ago, I manually submitted my domain site to Google to log it, Google even asked you to add in a tag on the page to prove it was yours. All this is changed now huh? 12.130.157.65 (talk) 14:08, 6 December 2017 (UTC).
 * Nope, they require you to prove the site is yours if you want to add it to webmaster tools or analytics. You do not have to do it in order to submit it, and that hasn't changed in the past decade. &#40;&#40;&#40;The Quixotic Potato&#41;&#41;&#41; (talk) 16:32, 8 December 2017 (UTC)

Vector field visualization apps: free, configurable, pretty?
Hi, I'm looking for apps that do vector field visualization, ideally like this:
 * 1) Must have animations, more options the better
 * 2) Available as multi-platform and runs in browser
 * 3) Alternately available as free and open source download for Mac or Linux
 * 4) Should enable basic manipulations of what functions determine the field (ideally free entry, not a list)
 * 5) Should enable at basic visualization manupulations (e.g. number of particles/lines, speed, color mapping, type of information shown, etc.)

Something like this or this  are along the lines of what I'm looking for, but I'm hoping to get suggestions that are better, or perhaps one piece of software that has all this. Thanks, SemanticMantis (talk) 23:16, 5 December 2017 (UTC)


 * Some more items to look at: vPython, commonly used for physics education, can plot fields (example and other tools); GNU Octave can plot 2D fields with almost no effort. Both are free software.  Historically, I've hooked those up to web servers (using very old-fashioned, extremely reliable and high-performance cgi interfaces); but I bet you can find new stuff nowadays that sits inside of some slow and crufty web content management package manager...
 * You can also directly draw lines using WebGL, but as this tutorial points out - drawing lines is hard! Nonetheless, if you can learn to draw lines, you can plot arbitrary mathematical functions using a fairly modern, fairly-high-performance, cross-platform, web-enabled technology...
 * Nimur (talk) 19:56, 7 December 2017 (UTC)