User talk:Cmglee/archive2023

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Topics started in 2023

3D FreeCAD rendition

Y2023m01d08, Alonsa, Manitoba, Canada Dear Cmglee, I am working with a fellow in Afghanistan to create a 3D FreeCAD rendition of a new device were inventing for detecting and ablating breast cancers. It's a struggle, so if you're interested, your help would be appreciated. -DickGordonCan@protonmail.com

Thanks for your message, DickGordonCan. As I'm currently more interested in public education than commercial commissions, I'll have to pass on your offer. Best wishes in your project, cmɢʟee⎆τaʟκ 01:53, 9 January 2023 (UTC)

Ring spinning illustration?

I don't know if you'd be interested in this subject area, but ring spinning, like many textile topics, is an intensely spatial, repetitive process that is hard to describe in words. A dynamic SVG illustrating it would be really useful to the encyclopedia, if you do happen to take an interest. HLHJ (talk) 17:03, 8 January 2023 (UTC)

@HLHJ: I'm unfamiliar with the topic but am willing to give it a go. Do you have an existing animation or video that i can base it on? Cheers, cmɢʟee⎆τaʟκ 01:55, 9 January 2023 (UTC)

I'm not sure I can give you very useful references for that. Ring spinning#How it works has a text description, and this diagram of ring spinning with a description of each part might be helpful, for knowing what you are trying to see. Youtube has [1] and [2]; Rieter also has some Youtube videos on their machines.[3][4]. A textile museum (like the Queen Street Mill) might be a better bet. It seems to be very hard to take useful video of a ring spinning machine, and it also seems it's not something animators have taken an interest in.

more stuff that's even less useful, including all I could find on Commons

File:Leden van de Eerste en Tweede Kamer brengen bezoek aan Nederlandse industrieën Weeknummer 51-37 - Open Beelden - 14588.ogv technically shows it at 1:34, I think, but it's uselessly low-res. File:Filature et Tissage du coton (1920).webm has flyers at 3:30 and what it says is a spinning frame at 4:40. This stock footage of ring spinning shows machines, but it happens out of sight. This vid and this vid show ring spinning off the top, but it's so fast you can't see the mechanism.

Commons doesn't seem to have any textile animations at all; our written textile content is also surprisingly weak, so I think it's systemic bias. Production is either very automated indeed, or located in lower-income countries with fewer editors, or both.

A century ago there was a lot more content, but unsurprisingly not animations. "Instruction book on ring spinning" is a bit too high-level, and Guide To The Ring Spinning Frame is more useful but it's a terrible scan. This Google-scanned book might be more helpful. The Cambridge University Library is pretty much guaranteed to be a lot more helpful. I can try hunting down suitable museums or experts for you, but that'd probably mean sending e-mails, so it would take a few days. HLHJ (talk) 06:07, 9 January 2023 (UTC)

Thanks for finding the resources. http://youtube.com/watch?v=1iWGVZv_XkU&t=73s has an animation which seems to describe it quite well. Is that the most important part of the process that warrants animation? Rather than reinvent the wheel, could we not just link to it? Cheers, cmɢʟee⎆τaʟκ 11:38, 9 January 2023 (UTC)

We could link, and that would be something. The video as a whole isn't bad, but I'm not impressed with that animation. It doesn't clearly show that the bobbin is spinning, driven by the spindle inside, which in turn is driven by the (unshown) drive band below. In the animation, it looks as if the ring and traveller are powered, and the bobbin is staying still, because the animator has not given the protruding portion of the bobbin any surface features. The black-on-black also isn't very visible.

It seems to me that the key part of the process is how the roving is twisted and the thread wound in one operation, but in separate locations (if you've ever used a spinning wheel without a flyer, pulling the thread ~in line with the axis of the spindle twists it more, and pulling it perpendicular winds it up; in ring spinning, the subparallel length before the traveller twists, and the perpendicular length after the traveller winds). The animation shows the winding, but the twisting is only inconspicuously visible in the first few seconds, which don't show the ring mechanism at all. And if the viewer hasn't guessed that the spindle is spinning, imagining the thread twisting would not come naturally.

The still image at 9:20 is actually much more informative, and looks as if it was taken from a public-domain publication, but I've done a through search and I can't find a copy of it, so my guess is that it's scanned from an old book. I could make a sequence of still SVG images showing the same information, but I thought that a slow-motion animation, say with moving diagonal lines of increasingly close spacing to show the twist, might work better. I could be wrong, I know little about making animations. HLHJ (talk) 01:16, 10 January 2023 (UTC)

Pseudo-3D SVG animation

I thought the traveller was powered, too. In that case, you're right that the animation is lacking, and also doesn't show the twist.

The situation in the 9:20 image shouldn't persist, though: wouldn't the number of twists in the yarn between the guide and the traveller settle to an equilibrium? Otherwise, the twists will build up indefinitely.

Thinking more about it, a 3D render is likely more suitable for an animation (or even better, a real machine run an very low speed and with marks drawn on selected points). SVG is basically 2D and my pseudo-3D animations result from tricks which work only in specific scenarios, such as where all rotating parts are perpendicular to the axis of rotation, such as this one. cmɢʟee⎆τaʟκ 04:07, 10 January 2023 (UTC)

You are quite right, the number of twists is in equilibrium, and increases towards the traveller. It's hard to show continuous processes in still images.

That would be quite the slowdown, they can travel at 160kph.[5] I like the idea but the machinery might well not be able to do that.

I'm afraid I'm not sure I understand what you mean by "all rotating parts are perpendicular to the axis of rotation". So the cylinders sides are pseudo-sides, made up of rotating circles parallel to the numbered circular faces? That would make it very awkward. I wonder if Blender could do twists. I imagine it would take some rendering... HLHJ (talk) 06:17, 10 January 2023 (UTC)

Meander images

Can you produce a smooth replacement for this raggedy image, used as an illustrative example in the article Meander (mathematics)? I think a few additional and less extremely simple examples may help to get the idea across, so I drew (freehand) two examples of order 4: Example A; Example B. If you could turn these two too into something looking more professional, we can add them to the article. I drew circular 180° arcs with perpendicular line crossings, but that is not essential as long as the topological properties are preserved. That also applies for the raggedy image; there is no reason why it should be a perfectly symmetric circle. For clarity, though, the curve should be smooth, the arcs not too small and the crossings fairly steep. The larger arcs could be more elliptical so that the bulge in example B is less high. I suppose that SVG may be a better format for this type of illustration than PNG.  --Lambiam 21:58, 20 March 2023 (UTC)

@Lambiam: Thanks for bringing the topic to my attention – seems a worthwhile task. I don't fully understand how the same diagram is a meander of order 1 and semi-meander of order 2. Is a meander of order n always a semi-meander of order 2n?

The article notes, "The number of distinct semi-meanders of order n is the semi-meandric number Mn (usually denoted with an overline instead of an underline)," yet the M there and in the list below has an underline instead of an overline. Is that a mistake?

Should the intersects be at non-uniform intervals to avoid misleading readers that they are uniformly spaced? cmɢʟee⎆τaʟκ 04:17, 21 March 2023 (UTC)

I've drawn some figures, intentionally making them less symmetrical, and uploaded them to commons:Category:Mathematical_meanders. I've added three to Meander (mathematics) but am unsure how you wish to use the other order 4 ones. Cheers, cmɢʟee⎆τaʟκ 14:04, 21 March 2023 (UTC)

Thanks. A meander of order n crosses the line 2n times, so if we truncate the line to a ray such that the part that is cut away does not cross the closed curve, we still have 2n crossings, making this a semi-meander of order 2n. I intended the order 4 ones to be used in the first Examples section.

I am a bit puzzled by M₃ = 2. I can find only one order-3 semi-meander, unless flipping one upside down is disallowed. But this operation is a homeomorphism, and if it is not allowed there are two order-2 meanders.  --Lambiam 14:15, 21 March 2023 (UTC)

The two semi-meanders of order 3 are shown in Figure 3 here, as well as two of order 4 that are not meanders of order 2. Apparently flipping is not allowed.  --Lambiam 14:33, 21 March 2023 (UTC)

I now get the meaning of semi-meander. It's puzzling to me to, as presumably the only two possibilities are "1 2 3" and "1 3 2", but the latter is just traversing the curve in the opposite direction. Perhaps if the part which would have crossed if the ray was extended to a line can be denoted with "*", then "1 * 2 3" is considered different from "1 2 * 3"? Cheers, cmɢʟee⎆τaʟκ 14:34, 21 March 2023 (UTC)

I see you've found the correct explanation. cmɢʟee⎆τaʟκ 14:34, 21 March 2023 (UTC)

Can you check if my order 2 is correct, that it should be crossings under current orientation of line and curve, not the minimum possible crossings under any orientation? (I intentionally used the same shape to confirm this point.) cmɢʟee⎆τaʟκ 14:36, 21 March 2023 (UTC)

curiously resembles an abbreviation for "Wikipedia": perhaps a redrawing could be the unofficial logo for the Wikipedia mathematics reference desk! cmɢʟee⎆τaʟκ 14:50, 21 March 2023 (UTC)

Another one is an S lying on its side. I see now that all sources actually have M₃ = 8. No flipping allowed anywhere, which means that W and M are different, as are b, d, p and q, and S and Z (rotated 90°). The indices in the section Meandric numbers are off by 1; they are too high. The sequence should start with M₀ = 1. I have not looked at the other numbers sections yet – gotta run to do errands. This source defines meander equivalence in terms of a continuous deformation, so flipping is excluded.  --Lambiam 15:34, 21 March 2023 (UTC)

Good point, @Lambiam. Cheers, cmɢʟee⎆τaʟκ 13:50, 22 March 2023 (UTC)

Magic Hexagon

https://en.wikipedia.org/wiki/File:MagicHexagon-Order8.svg In the first row "62" should be "-62". --18:42, 30 March 2023 (UTC) — Preceding unsigned comment added by 79.206.207.225 (talk)

Thanks and well spotted! I've fixed it. Cheers, cmɢʟee⎆τaʟκ 02:59, 31 March 2023 (UTC)

Potong bebek angsa

${\begin{aligned}&55{\dot {1}}{\dot {1}}{\dot {1}}\,{\dot {1}}\;\;7{\dot {1}}{\dot {2}}7{\dot {1}}\,{\dot {1}}\\&55{\dot {1}}{\dot {2}}{\dot {3}}\,{\dot {3}}\;\;{\dot {2}}{\dot {3}}{\dot {4}}{\dot {2}}{\dot {3}}\,{\dot {3}}\\&{\dot {4}}\,{\dot {6}}{\dot {4}}{\dot {2}}\,{\dot {4}}\;\;{\dot {3}}\,{\dot {5}}{\dot {3}}{\dot {1}}\,{\dot {3}}\\&{\dot {2}}{\dot {3}}{\dot {4}}{\dot {2}}7567{\dot {1}}\,{\dot {3}}\,{\dot {5}}\\&{\dot {4}}\,{\dot {6}}{\dot {4}}{\dot {2}}\,{\dot {4}}\;\;{\dot {3}}\,{\dot {5}}{\dot {3}}{\dot {1}}\,{\dot {3}}\\&{\dot {2}}{\dot {3}}{\dot {4}}{\dot {2}}7567{\dot {1}}\,{\dot {3}}\,{\dot {1}}\\\end{aligned}}$
cmɢʟee⎆τaʟκ 09:41, 12 April 2023 (UTC)

The man (or woman) behind Cmglee

Hey Cmglee! I was scouring some of my old edits recently and came across the old Bayes' Theorem image debacle. Really funny situation and still a great image - I'm glad it is still up and you deserve recognition over it. I will never regret voting for it to stay up.

That said, I've had your user page saved on my watchlist since then because your SVG art is really well done and touches on so many different topics.

So, I have to ask: what do you do for a living to stay so abreast of a variety of different subjects? I'm just very curious to know more (if you're comfortable sharing!).

Thank you for your many valued contributions to Wikipedia and I sincerely hope you'll always stay. — That Coptic Guy (let's talk?) 06:04, 14 April 2023 (UTC)

@That Coptic Guy: Many thanks for your compliments – really kind of you to say so! I'm also glad File:Bayes_theorem_assassin.svg was kept, thanks to your (and others') support for it.

Illustrating Wikipedia combines my passions: art, science, technology, maths and teaching. It's my biggest avocation since I took it up around 2010. I'm particularly into making STEM subjects more accessible to the public and strive to find new ways to explain concepts.

For now, I prefer to compartmentalise my Wikimedia, professional and private life. That said, I'm a software engineer and educator by trade, and am open to collaborate in non-Wiki projects: please "Email this user" in such cases.

Thanks for reminding me that I should update my user page more often: I had no idea if anyone actually looked at it!

Cheers,
cmɢʟee⎆τaʟκ 15:46, 14 April 2023 (UTC)

Talk:Color blindness – Punnett squares

Hi Cmglee, I have added a section to the Talk page for Color blindness, about the Punnett squares I think you contributed. Could you have a look, please? Thanks in advance. Frans Fowler (talk) 13:17, 2 June 2023 (UTC)

Thanks, @Frans Fowler. I'll reply on the talk page. Cheers, cmɢʟee⎆τaʟκ 00:28, 5 June 2023 (UTC)

Generation timeline update

Hi there. On File:Generation timeline.svg, do you think we really need things like the world events listed? Because some would argue "Hey why isn't [such and such] event here" like the Gulf War for instance. I feel like it would be more concise to just have the generation names and birth years.

Also, it displays a "29 F8" error message on the sections where there's supposed to be a "/" (i.e. "Greatest/G.I. Generation"). 204.111.198.147 (talk) 00:56, 15 June 2023 (UTC)

Thanks. I've replied on commons:user_talk:cmglee#Generation_timeline_update. cmɢʟee⎆τaʟκ 07:09, 16 June 2023 (UTC)

Phase diagram of water

Hello, I would like to contact You regarding permission to use your diagram in the book. Can I ask You for Your email adress? MW 156.17.170.202 (talk) 11:18, 31 July 2023 (UTC)

Certainly, and thanks for checking back with me. After signing up for a free Wikipedia account, clicking Special:EmailUser/cmglee opens a form for you to email me. Alternatively, based on the examples at http://commons.wikimedia.org/wiki/Commons:Credit_line#CC-BY_and_CC-BY-SA_licenses , you could have

© CMG Lee / http://commons.wikimedia.org/wiki/file:phase_diagram_of_water.svg / CC-BY-SA-3.0

If you wouldn't mind, could you please share a link to your book when it's published? Thanks, cmɢʟee⎆τaʟκ 15:53, 3 August 2023 (UTC)

Middle C

Middle C on a Grand Staff

http://en.wikipedia.org/w/index.php?title=C_(musical_note)&action=edit&section=3

Questions about File:World top peak prominence.svg

Dear @Cmglee,

First of all I would like to thank you for all your contributions. I teach a course in data visualization and we came across your 'world top peak prominence' visualization. I have a couple of questions and hope you don't mind answering them.

1. Which relationship are we talking about in the visualization? What do the lines under the x-axis represent? 2. What would you argue is your main message behind this visualization? 3. How did you decide on the categorization of the continents? My guess was that it's by 'island'. 4. How did you manage to have such a nice spacing in the mountain names + heights at the top of the chart? It does not look like you use a monospace font.

I am currently recreating the plot using ggplot2 in R - it has been quite a journey. The plan is to use this visualization as an inspiration in our class with of course appropriate credit.

Best, Victoria 2A02:A467:B361:1:24E0:375:9CB8:C11E (talk) 13:13, 2 November 2023 (UTC)

Hi Victoria,

Thanks for your message and interest in my diagram.

1. The diagram attempts to show (not very well) the hierarchy of peaks, grouped by island, in descending order of prominence. The lines connect each peak with its encirclement and prominence parent peaks, if any. It's clearer if you view the SVG files directly on a computer with a mouse and hover your mouse pointer over a peak, such as Mt Whitney, and follow peaks the line subsequently points to and so forth.
2. As above, the diagram attempts to show the hierarchy of peaks, grouped by island, in descending order of prominence.
3. Yes, it's by island. Black peaks are for other islands.
4. SVG has the tspan tag which takes in coordinates to manually place different parts of a text string.

I hope the diagram is useful in your class. If you'd like to see other dynamic SVG I've made, see user:cmglee/Dynamic_SVG_for_Wikimedia_projects.

Cheers,
cmɢʟee⎆τaʟκ 14:05, 2 November 2023 (UTC)

Dear CMGlee,

Thanks for your answer, it’s very enlightening! Much appreciated.

Best,

Victoria 2A02:A467:B361:1:1D80:2D4E:D8C1:9C7F (talk) 17:31, 2 November 2023 (UTC)

Proposing a merge

Generally speaking, when one does so, one should leave an affirmative argument explaining why you believe a merge should happen on one of the talk-pages; see WP:MERGEPROP. --JBL (talk) 18:13, 14 November 2023 (UTC)

Done, thanks. Cheers, cmɢʟee⎆τaʟκ 23:12, 14 November 2023 (UTC)

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Tools for creating svg

I'm very impressed by your image for barrel shifter. I was wondering if you could share what tool you used to produce it, or was it done programmatically? Thanks a lot!

Digital27 (talk) 04:07, 18 December 2023 (UTC)

@Digital27: Many thanks for your compliment. I wrote the SVG code by hand in Notepad++.

file:crossbar_barrel_shifter.svg is actually one of my simpler illustrations. Most of my works are either done by hand, or generated using customised Python or Perl scripts. You can see my recent diagrams at http://commons.wikimedia.org/w/index.php?title=Special:ListFiles&user=cmglee .

If you've any particular requests, let me know. Cheers, cmɢʟee⎆τaʟκ 07:31, 18 December 2023 (UTC)

Thanks for your quick reply! I just wanted to learn about how you did it. Writing it by hand is very impressive. I'll try to do some my own, and ask you questions when I have issues. Digital27 (talk) 07:35, 18 December 2023 (UTC)

Certainly. Glad to help! cmɢʟee⎆τaʟκ 07:39, 18 December 2023 (UTC)

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Wikipedia:Featured picture candidates/Peripheral drift illusion

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Thanks for fixing File:World Population Prospects.svg

File:World Population Prospects.svg

https://en.wikipedia.org/w/index.php?title=Wikipedia%3ASVG_help&diff=1186911280&oldid=1186692434

Just noticed it. :) --Timeshifter (talk) 18:53, 25 December 2023 (UTC)

My pleasure, cmɢʟee⎆τaʟκ 02:16, 26 December 2023 (UTC)

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≤ 2O1O	2O11	2O12	2O13	2O14	2O15	2O16	2O17	2O18	2O19
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