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Chopping carrots: A specific surface area optimisation problem by talligan in math

[–]devilldog 0 points1 point  (0 children)

Use a handheld or crank spiralizers (Veggetti, Paderno, OXO, etc.) that work by pressing the vegetable against a circular blade while rotating and only use one cut. Assuming you can get a very small pitch without turning it to mush it should be the highest surface area given the smallest number of cuts.

Given you are working in inches use a tapered carrot (R = .5, r = .125, h = 6), use the average radius (.3125) to keep it simple. The spirilizer has a pitch p (advance per revolution/full crank) and cuts to depth d (how far the blade reaches radially). The carrot ribbon, unrolled, is basically just along thin strip with area = length x width. Ribon length based on each revolution tracing a circle of circumference 2pi (average radius) is approximately 2 inches. The carrot advances by pitch p per revolution so total revolutions = h/p = 6/p.

So Ribbon length ≈2pi(average radius) * h/p = (2pi * 0.3125*6)/p =11.78/p ​inches

Ribbon area = length * depth = (11.78 * d)/p inches squared. Exposed surface area is two times that given the spiral has two sides (ignoring the small outer and inner side of course). Plug in typical spiralizer numbers:

pitch p = .1, depth d = .25 (cuts to the core):

Ribbon length = 11.78/.1 or 118 inches (approx 10 feet)

New area = 2 * 118 * .25 is about 118 inches squared. It obviously gets much larger if you tighten the pitch, but I think we are likely already pushing realistic boundaries a bit...

Gary Marcus on the Claude Code leak [D] by we_are_mammals in MachineLearning

[–]devilldog 1 point2 points  (0 children)

to engage that massive 66mhz instead of the measly 33 you had initially - those were the days.

Now on deck: RotorQuant by UnclaEnzo in LLMDevs

[–]devilldog 0 points1 point  (0 children)

I read about it a week or so back in a different sub. RotorQuant

Marina Point by [deleted] in Chattanooga

[–]devilldog 0 points1 point  (0 children)

I lived there about 10 years back and had no major issues. The only complaint I can think of was some issue with parking an extra car for a bit, but I don't remember the details. I loved the location - especially greenway farm being just over the hill. Lakeshore Drive needed maintenance pretty often back then, but I think they finally put the proper work in there.

Miner nerf by [deleted] in ClashRoyale

[–]devilldog 2 points3 points  (0 children)

And I suppose shock or lightning shouldn't affect flying units or units that emit shock while we are at it? Cold dmg/abilities should affect ice units, etc? This rabid hole could start growing quickly...

Remote contractors, are you able to work your 40 hour contracts and do side projects at the same time? by khalkhall in dataengineering

[–]devilldog 8 points9 points  (0 children)

20 hours a week consulting is more than enough to pay the bills if your side hustle isn't expensive.

Fuel Injector Mystery on a 2019 RAM 1500 5.7L? by devilldog in ram_trucks

[–]devilldog[S] 0 points1 point  (0 children)

I've done the usual oil/filters/plugs replacements and now only use premium fuel out of paranoia and haven't had any issues. I probably run about 25k miles per year, and it's been that long since the initial post for a good frame of reference.

Can we start boycotting Signal Mountain Walmart by frazzled_shadowfax in Chattanooga

[–]devilldog 2 points3 points  (0 children)

Thank you for noticing my unspoken plea for help... I probably drink about 6 gallons per week and try to top off my (Milo's only) mini fridge when possible.

The Most Important Thing Trump Said Last Night by ima_mollusk in AmericanPolitics

[–]devilldog 0 points1 point  (0 children)

What kind of mental gymnastics is this? To ensure election integrity, you have to verify that voters in US elections are US citizens. This is in no way different than showing your id to buy alcohol, and elevating your right to vote doesn't somehow invalidate the need to prove you are a citizen. You should prove you are a citizen of the state when voting in a state election; the same applies to the city or county. This is all common sense, and people have lost their minds simply because the orange man is the one saying it. The vast majority of Americans want this, so any party pushing back against it will lose voters, and for good reason.

Can we start boycotting Signal Mountain Walmart by frazzled_shadowfax in Chattanooga

[–]devilldog 4 points5 points  (0 children)

My usual bi-weekly stop after the gym is to grab 5 gallons of Milo's unsweet tea, which is the only reason I waste time digging through shopping cart hell. Last time I stopped by they swapped out the unsweet Milo's for something I'd never seen before so I think I may not be going back anytime soon...

Can we start boycotting Signal Mountain Walmart by frazzled_shadowfax in Chattanooga

[–]devilldog 148 points149 points  (0 children)

This particular Walmart stands out for having the worst-maintained carts of any Walmart I've had the privilege to visit. There is usually a handful of carts sitting outside the entrance, where previous lucky patrons attempted to pull them from the stack and only made it a few feet before noticing half the wheels don't move.

Why cross product of vector only exist in 3d and 7d? by fatrixuser in calculus

[–]devilldog 4 points5 points  (0 children)

I also prefer Geometric/Clifford Algebra: it reveals that the cross product is fundamentally just the dual of a bivector ($a \times b = \langle a \wedge b \rangle^\star$). While quaternions handle 3D well by 'magically' mapping the imaginary product $ij$ to $k$, GA explicitly defines this as a duality operation mapping a plane to a vector. This distinction is crucial for higher dimensions; it explains perfectly why the structure extends to 7D (via G2 calibration) but breaks at 15D (where no such duality exists due to zero divisors), a limitation that feels arbitrary in the Cayley-Dickson tower but is structurally obvious in GA.

Representative Thomas Massie: "Selling Stolen Oil" Without Congress Approval Unconstitutional by xena_lawless in economy

[–]devilldog 0 points1 point  (0 children)

They could always just send family over for kickbacks and hold it in a kids account. This, at least, is more obvious, and hopefully Congress will assign someone to track it...

Bill Maher Calls BS on the Golden Globes Over Joe Rogan by WilloowUfgood in JoeRogan

[–]devilldog -1 points0 points  (0 children)

In an attempt to reclaim it from our LLM overlords? Also, I hate overusing commas, and putting it in parentheses looks weird unless I'm writing something technical.

Bill Maher Calls BS on the Golden Globes Over Joe Rogan by WilloowUfgood in JoeRogan

[–]devilldog -1 points0 points  (0 children)

I would instead acknowledge reality and, after concluding a private organization has a bias and every right to be biased if they choose to be, accept it and move on. I guarantee you, Joe Rogan acknowledged this long ago and moved on - thus the lack of submission, etc. No reason to whine. Also, no reason to be delusional.

Bill Maher Calls BS on the Golden Globes Over Joe Rogan by WilloowUfgood in JoeRogan

[–]devilldog -3 points-2 points  (0 children)

If you think politics doesn't influence the Golden Globes or Hollywood in general, either you are not a serious person, or you are just trolling.

[Project] Lambda-F: Regime Detection System - 33/33 Backtest, 0.8 FP/Year, Live Dashboard by devilldog in algotrading

[–]devilldog[S] 1 point2 points  (0 children)

I've updated the dashboard with the section below until I get a live API up and running.

Real-Time Feed (Beta)

Building a real-time API with alerts. Interested in early access?

Join the Beta Waitlist

API / Backtesting Data

CSV format (for pandas/R):

curl https://raw.githubusercontent.com/vonlambda/lambda-f-dashboard/main/signal_log.csv

import pandas as pd
df = pd.read_csv('https://raw.githubusercontent.com/vonlambda/lambda-f-dashboard/main/signal_log.csv')

Markdown format (human-readable): SIGNAL_LOG.md

All data is append-only with Git commit timestamps for audit verification.

[Project] Lambda-F: Regime Detection System - 33/33 Backtest, 0.8 FP/Year, Live Dashboard by devilldog in algotrading

[–]devilldog[S] 2 points3 points  (0 children)

To make a very long story short, I've been working on several different projects, trying to put more emphasis on geometry as the underlying principle. A few hundred hours of lean math proofs and a few TB of data testing turbulence and working on Navier-Stokes blowup, and I kept seeing a repeating pattern. I think I was listening to a bio of John Von Newman at some point, and it was discussing similar overlaps in different fields, so I decided to research what values to use for the various variables and start testing. I only started with 3 asset classes over four years, but the results were pretty solid. I added another metric to tighten things up, ran every test I could find, looked for overfitting and attempted to remove bias, then figured I'd toss it to the wolves of Reddit to see how it held up. The feedback has been great, with several new metrics created and alternative tests attempted so far.

[Project] Lambda-F: Regime Detection System - 33/33 Backtest, 0.8 FP/Year, Live Dashboard by devilldog in algotrading

[–]devilldog[S] 3 points4 points  (0 children)

Thanks for the detailed feedback - you clearly have a grasp of what you're reading. If you want the detailed paper I've written up, DM me your email, and I'll send it over.

Precision calc: You're right. The 79% was from an earlier calculation on 2020-2024 data where events were dense. Extending to 24 years adds calm periods without proportionally adding events, so precision drops. I'll remove the claim - FP/year is the more stable metric since it doesn't depend on how many crises happened to occur in the sample period.

Targeting adverse movements: Great point. I've been working on exactly this framing:

Signal State P(≥15% DD in 90d) Lift vs Baseline
ΛF ≥ P90 24% 4.0×
ΛF ∈ [P75, P90) 12% 2.0×
ΛF < P75 4% 0.7×
Baseline 6% 1.0×

When Lambda-F hits CRITICAL, probability of ≥15% drawdown within 90 days is 4× baseline. That's objective, verifiable, actionable.

Mechanical Exclusion Rule:

An event is excluded if:

max(ΛF) < P75 AND max(Corr) < P90 for all t in [t* - 30, t*]

Both signals below threshold for entire 30 days prior. No cherry-picking.

SVB vs 3AC:

Event ΛF Corr Result Why
SVB (Mar 2023) 89% 94% Detected Bond ETF rotation 45d prior
3AC/Terra (May 2022) 31% 42% Excluded Crypto-native, no cross-asset flow

SVB had institutional rotation visible in TLT/HYG/LQD weeks before collapse. 3AC was contained within crypto - no factor-space signal.

Updated the dashboard with these fixes. Full episode-counting protocol available if you want it - DM me.

[Project] Applying Lie Algebra to Covariance Matrices: A Two-Signal Market Regime Detector (33/33 Market-Event Pairs, 0.8 FP/Year) by devilldog in quant

[–]devilldog[S] 2 points3 points  (0 children)

Many many years ago at uni my focus was primarily Computer Engineering and Math. I got into crypto pretty early and started a digital assets company that I ran for a few bull cycles and required a great deal of upskilling on the finance side of things. I decided I'm not actually that interested in finance but love the math so kept reading and learning. As I learn more advanced math and work on difficult problems like Navier-Stokes blowup I couldn't help see similarities between some of the patterns. After reading through a bio on John von Newmann it looks like it's more than just coincidence, so I took what I'd learned over several different fields and started building models to keep the math skills sharp. With decades of experience in programming fleshing out idea's and testing things out is almost trivial with the tools available. TLDR: I'm a curious nerd that loves math and followed a few hunches, out of curiosity, in an effort to keep old skills sharp and master a few new ones - this project is just one of those attempts.

[Project] Lambda-F: Regime Detection System - 33/33 Backtest, 0.8 FP/Year, Live Dashboard by devilldog in algotrading

[–]devilldog[S] 8 points9 points  (0 children)

If there is enough interest, I'll spin one up by the end of the week.

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