@christianp@mathstodon.xyz
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christianp

@christianp@mathstodon.xyz

Mathematician, koala fan, mathstodon.xyz admin,
⅓ of https://aperiodical.com. He/him

This profile is from a federated server and may be incomplete. Browse more on the original instance.

christianp, to random
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Outlook on the web has a fun new bug (in Firefox on my Ubuntu PC) where the cursor is invisible in certain positions.

christianp, to random
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After upgrading Ubuntu to 24.04, but not immediately, I started having a problem where the system would just show an all-white screen on boot.
After searching, I tried updating my BIOS firmware, but that didn't fix it.
I've finally managed to work out how to turn off the proprietary nvidia drivers from the command line, and it's now showing something, with the open source nouveau driver.
Next I'll try re-installing the latest nvidia driver, and see if that works.

Writing this more for my own reference next time it happens than anything else.

christianp,
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@mair nope, but amazing timing - I literally gave the monitor to the person collecting it for a refund 5 minutes ago!
I think something wore out inside - it got worse and worse over time

christianp,
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@mair at least...

christianp, to random
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The weather forecast says highs of 12C for the next week.
It's JUNE!

christianp, to random
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I have several hundred strips of paper in two colours.
What should I make with them? I reckon something woven would be good, but what?

christianp,
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@diffgeom I think I did it! (but it really wants to unravel itself, as in the second photo)

The same thing, but unravelled. It looks like there are two tight half-turn twists, and I suppose a third one across the rest of the length of the strip

christianp,
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Follow along as CLP reinvents ancient crafts!

I might need some more geometrically interesting suggestions from @alisonmartin57

christianp,
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@diffgeom it certainly is a challenge! I did it once without really thinking, then unravelled it again to take that photo, and now I have to do some Big Thinking

christianp,
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@mathcination ooooooh!

christianp, to random
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@57isprime welcome! Keep fighting the good fight!
https://aperiodical.com/2016/05/are-you-sure-51-isnt-prime-analysing-the-results-of-the-is-this-prime-game/

christianp,
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@mair it caches the stats once per day, so you must have been the first to request it. It looks like it's finished and the page loads now.
A while ago, 87 took the lead as the most common error.

christianp, to random
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My friendly local bike mechanic, in the course of replacing my bike's cassette, has just discovered that the bearings underneath have completely disintegrated.
How does that happen‽

christianp,
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Mr Bike says "there are increased loads on the bearings especially with taller riders".

Well. Poor old beanpole me.

christianp, to random
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"It's a simple task," I thought, "don't overthink it, just use a spreadsheet."

I can't work out how to do this: I have two series of height measurements of my kids, along with their ages when the measurements were taken.
How do I plot them both on the same scatter graph, so I can see which kid was taller at any age?

I thought that if I added a column saying which kid each measurement was from, I'd be able to use it to set the marker colour or style, but that doesn't seem to be an option.

Please don't suggest any other tools for this: I'm more than capable of doing it outside a spreadsheet; I just want to know if it's possible in Google Sheets.

christianp, to random
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Can we do six degrees of separation with Rachel Reeves, Labour shadow chancellor, and Keanu Reeves, widely-loved actor?
I'll take any link - TV appearance, music credit, family relation,...

christianp,
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@millerdl ooh, I feel good about that

gregeganSF, to random
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I wasn’t sure if any of these entries were jokes, but the most amusing one checks out as valid:

“A quasigroup with an idempotent element is called a pique ("pointed idempotent quasigroup")”

https://en.wikipedia.org/wiki/Quasigroup

The diagram is from:

https://x.com/arithmoquine/status/1798018671194829070

christianp,
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@gregeganSF There's got to be something that can go above sets. Classes?

dpiponi, to random
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Google makes terrible design decisions. It's so hard to distinguish the icons they use for transport. You have to look really closely to see that the little marks under the vehicle represent rails, not wheels. And the black background presumably indicates a tunnel. So this is the subway. But it's not, it's a tram that travels above ground.

I like words.

christianp,
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@dpiponi yes! This always annoys me, too.

christianp, to random
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Parenting is equal parts being woken up at 04:00 and being blown away by how clever they are.
Yesterday my daughter delivered on both counts, and made these cute kitten sandcastles.

christianp, to random
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It can be hard to articulate how #dyspraxia affects me.
The clumsiness is easy - I drop things and bump into things a lot more often than most people.
But the executive function problems are harder to understand.
Yesterday I had a perfect example of it:

I needed to take the bin out. First I had to go and pick up the bin. Then I had to decide whether I'd go out through the front door, or the garage. I chose the garage, so I opened the garage door. I got outside and...

I wasn't holding the bin. The first step had completely vanished from my mind and I didn't realise until I needed to be holding a bin.

yatil, to random
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Accessibility tests are much easier if you go by success criterion and write up failures of them instead of identifying possible issues and then assign SCs to it.

And it gives you a handy guide to keep track of what you already tested and what not. Try to flip your approach and see if you think it’s easier, too!

christianp,
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@yatil it wouldn't occur to me to do it the other way round! It feels completely sensible to start by looking at success criteria

christianp, to random
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Now that I have realised I can do this, I am a bad person:

ssh other_pc 'cd repo && git diff' | git apply

christianp,
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@pozorvlak yeah, I've piped diffs into git apply before, but usually I make a patch file, then transfer it to the machine I want to apply it on. The new thing to me is that I can write a single line for a one-off "get the changes I made elsewhere" action without adding a remote to the git config or going through github

christianp, to random
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The UN says that today is World Bicycle Day (https://www.un.org/en/observances/bicycle-day)

I've unknowingly celebrated with quite a bikey day: I took the kids to school in the #BucketBike, rode my hybrid bike down to the mechanic to get it fixed, then rode the bucket bike to the supermarket for a bit of shopping, then I'll take it back up to school to pick the kids up.

Lovely weather for it!

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