Recent comments in /f/dataisbeautiful

vetratten t1_ja7i7tt wrote

Reply to comment by IncomeStatementGuy in [OC] How Rolls-Royce makes money: Lots of aftermarket services and tiny profit margins by IncomeStatementGuy

Depends on the data and audience and usually we put in a means to switch between thousands, millions, billions on our dashboards.

For a static like this where the numbers have such a wide range I'm torn as I usually prefer everything to be the same notation. The beauty of the Sankey is you could keep the notation by step. So for instance the far right step being in Millions but the middle step in Billions. It's not perfect by any stretch and I'd still be annoyed that they're not all in billions.

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ThePuffySocks t1_ja7gf9e wrote

Reply to [OC] This year I'm trying to document how my mental illness progresses/regresses to see if there's some sort of pattern by SomeDumbGirl

very nice idea, will try something similar! I have a diagnosis for ADHD, and now taking a non-stimulant medication for treating which helps me to some degree. did you try being tested for ADD/ADHD? you might qualify for it too, and then (if you get a diagnosis) might be able to get some accommodations and/or try what meditation would help. also just reading on it, and on how trauma impact the brain and body, might help to find useful tips etc🤔

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Oh_Tassos OP t1_ja7fntq wrote

Reply to [OC] A graphical visualisation of the answer to a problem from the Greek Mathematics Olympiad (*sort of) by Oh_Tassos

Hello! What I've created for you today is, as the title describes, a way to visualise the answer to a problem from the Greek Mathematics Olympiad, named "Archimedes" after the ancient mathematician, which took place on February 18.

Well... sort of. The truth is that we were given some corrections about this problem near the final hour of the 3-hour examination, which vastly limited the actual correct answers (to just 2, from infinite)

Here's my best attempt at a translation of the problem, you can find the original exam (along with the solutions and list of students who passed the exam) over on the Hellenic Mathematical Society's website here.

For the various values of the positive integer n, identify all the positive integers N which are perfect squares and in their decimal representation the digit 2 appears n times and the digit 5 once.

The correction we were given was that these positive integers N only contain the digits 2 and 5, and not any others. The real solutions are 25 and 225, and you can prove by mathematical induction that there is no solution for n ≥ 3.

This visualisation does not take the correction into account. To make it, I used a program I made in C++ (to identify the numbers N), a csv sheet, and a program I made in Python (to actually draw the visualisation).

I will note about the Python program that some parts of the code, those regarding the rescaling of the window when it went off-screen and the colour gradient, were actually written by a fellow r/dataisbeautiful member after an older post of mine about prime numbers. I do not remember their name to credit them correctly, but props to them for the help.

I would also like to share a few graphs I made regarding the difference between two successive numbers N in this "sequence", for I think they look interesting at a sufficient zoom level. Here

That's all, thank you for your time!

Edit: I forgot to mention that this visualisation includes the first 10592 positive integers N, which is how far the C++ program got before it crashed (I assume it was a memory issue)

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ButterflyCatastrophe t1_ja7af4j wrote

Reply to comment by soldforaspaceship in The Cost for an American to Comfortably Retire in Every State and Country, mapped by berrysardar

A retirement planner is going to look at the amount of principal you need in order to sustainably generate annual spending. ie: not spend principal, but add to it for inflation.

TFA is just looking at how much gets spent. ie: spend all the principal in 15 years.

Still useful as a relative benchmark.

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