JordiGH is a user on mathstodon.xyz. You can follow them or interact with them if you have an account anywhere in the fediverse. If you don't, you can sign up here.

JordiGH @JordiGH@mathstodon.xyz

Pinned toot

Oh, and one more, very important thing for ' sake.

I belong to @moonbug and @moonbug belongs to me.

Pinned toot

Time for new !

I'm Jordi. expat living in , . I can say expat instead of immigrant 'cause I've had a super-sheltered and comfortable life. Nothing dreadful has ever happened to me.

I like , , , , and old because I'm old (not that old).

I also do software stuff because of course.

I work on assessments and , which I want to call cause we need that word again!

Pinned toot

Hi, if you see that I'm recently following you again, that's because I had a little accident and I need to rebuild my account. Follow me back if you still want to hear the things I have to say!

JordiGH boosted

Did you know that you don't need to use link shorteners (bit.ly, etc.) on Mastodon? All links, no matter how long, only count for 23 characters against your 500 limit!

(And since link shorteners are bad for user experience and break the web, there's almost no good reason to use 'em! 😄)

🎶 ¡Mil campanas suenan en mi corazón! 🎵

The whole confusion with floats happens because 10 does not divide 2! So you can't exactly express in binary an exact expression in decimal. But the reverse is true, you can exactly express in decimal something in binary.

HOWEVER, you can certainly show more decimal digits after the 16th one! You see that mantissa? It has 52 powers of 2 in the bottom (denominator). You know what else has 52 powers of in the bottom? 52 decimal digits, because 2 divides 10!

So you can express, in decimal, the *exact* value that is stored in binary. You just need 52 decimal digits.

Try it! For example, in C++:

cout << setprecision(52) << 1.1;

1.10000000000000008881784197001252323389053344726562

Let's talk floating point!

The mantissas of IEEE 754 doubles are stored in binary, 52 bits + 1 implicit bit that is always on.
\[
m = 1 + \sum_{k=1}^{52} \frac{b_k}{2^k}
\]
That means that your precision in decimal ends up being around \(\log(2^{52})/\log(10) \approx 15.65\), so between 15 and 16 decimal digits.

But the actual mantissa is stored in binary, not in decimal. So everything after the 16th decimal digit is "garbage" 'cause you can't store anything smaller than \(1/10^{16}\).

I've spent this morning trying to explain floating point error to Excel users and probably not very clear about it. How has your day been so far?

JordiGH boosted

I had a very motivating discussion at lunch today with a grad school colleague and a postdoc, about how we never feel like we're being productive, but then suddenly we realize we've written the chapter/submitted the paper/conducted the experiment somewhere in between all the procrastination.

Academia: The job in which you're working all the time, but never feel like you are.

JordiGH boosted

As you settle into Mastodon, be sure to learn the lingo:
- "toot": a tweet
- "tusking": starting a pointless fight with another user
- "woolly": going viral, as in "wow, that toot really went woolly"
- "extinction event": when a whole instance goes down

Oh, and one more, very important thing for ' sake.

I belong to @moonbug and @moonbug belongs to me.

Time for new !

I'm Jordi. expat living in , . I can say expat instead of immigrant 'cause I've had a super-sheltered and comfortable life. Nothing dreadful has ever happened to me.

I like , , , , and old because I'm old (not that old).

I also do software stuff because of course.

I work on assessments and , which I want to call cause we need that word again!

In the "transform" ability in Japanese was first localised as "morph" because in Japanese it was originally actually shortened to "trans". In latter games, they instead decided that this would be "trance" in English, which actually kind of makes sense too, because your character would momentarily gain intense focus, change appearance, and become more powerful.

I'm trying to come up with good commentary for all of this, so until I do, I just have the bare facts.

JordiGH boosted

what the fuck is a federated timeline, am i on a spaceship

I need some Mastodon technical help.

So, because I'm on a resurrected account, some things aren't quite right. While it appears I can interact fine with at least some people, it appears that some of my old followers can't see me. For example, chaos.social says "404" whenever someone from that instance tries to follow this account. I just tried creating an account there and following this one to confirm this odd behaviour.

Anyone know what's up?

I'm never going to get used to issue trackers also being used as help forums (and not for tracking problems or issues, if you will, with the software).

JordiGH boosted

This is the best thing I have ever seen in my life
---
"All Star", translated to Aramaic and back into English. Sheer poetry.

#rock #metal #alt #engrish #smashmouth #WednesdayWisdom #clickbait
twitter.com/ApocalypseStn/stat

uspol Show more

@m3dras Says here you like wrestling... what about Mexican wrestling?

youtube.com/watch?v=Ce02T7glGp

I bought this candy only because I can't resist a good, bilingual pun. The French says, "Frank says to you hey, baie-baie" where "baie-baie" means" berry berry" but is pronounced like "baby".

I'm a slave to clever marketing.

pol, lgbt Show more

math, software, geometry, Dear Lazyweb Show more