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roguh / lightning_felina_riveracalzadillas_2026.html
Created May 17, 2026 14:25
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="Content-Style-Type" content="text/css" />
<meta name="generator" content="pandoc" />
<meta name="author" content="Felina Rivera Calzadillas 🇲🇽" />
<title>How to cover any parking lot with EV charging stations</title>
@roguh
roguh / lightning_felina_riveracalzadillas_2026.markdown
Created May 17, 2026 14:24
title How to cover any parking lot with EV charging stations
subtitle protip: easier than gasoline pumps at every parking lot
author Felina Rivera Calzadillas 🇲🇽

Powerflex

  • Leader in EV charging and distributed energy resources.
  • Adaptive Load Management
@roguh
roguh / mathics.m
Last active April 30, 2026 03:09
(* Some prime stuff in Mathics, an open source mathematica clone with pythonic influence *)
In[1]:= 2^255-19
Out[1]= 57896044618658097711785492504343953926634992332820282019728792003956564819949
In[2]:= 2^255+95
Out[2]= 57896044618658097711785492504343953926634992332820282019728792003956564820063
In[3]:= PrimeQ[2^255-19]
Out[3]= True
@roguh
roguh / psql-pass.sh
Created April 10, 2026 03:39
psql-pass.sh: A script to connect to postgres using credentials stored in Linux's passwordstore.
#!/bin/sh
# pgsql - connect to PostgreSQL using credentials from pass(1)
set -eu
if [ $# -lt 1 ]; then
echo "Usage: pgsql <pass-prefix> [extra psql args...]" >&2
echo "Reads from these secrets: <pass-prefix>/{host,port,user,dbname,password}" >&2
echo "https://www.passwordstore.org/" >&2
exit 1
fi
@roguh
roguh / mtplvcap_command.js
Created September 16, 2025 16:23
mtplvcap_command.js: Send commands to mtplvcap, control your Nikon camera through the CLI. See https://github.com/puhitaku/mtplvcap
#!/usr/bin/env node
const addr = process.env.MTPLVCAP_ADDRESS || "ws://localhost:42839/control"
// TODO: add the other mtplvcap commands
const payload = {af_focus_now: true}
let ws = new WebSocket(addr)
ws.onopen = () => {
ws.send(JSON.stringify(payload))
ws.close(1000, "Normal Closure")
}
@roguh
roguh / diff_and_conway.py
Last active March 27, 2025 15:37
With this code, you can define a Polynomial and find its derivative, its root (real or complex), and print it out as LaTeX math notation like 5x^2 + 2x - 3
"""This program is for working with Polynomials.
With this code, you can define a Polynomial and:
- convert it to LaTeX math notation
something like 5x^2 + 2x - 3
- find the derivative of a polynomial
- find a root of a one dimensional polynomial (floating point or complex/imaginary)
"""
from math import isclose
from typing import Sequence, Generic, TypeVar
@roguh
roguh / usda_hardiness_zones.json
Created February 22, 2025 17:16
USDA Hardiness Zones: described, programmatically defined, and serialized as JSON
{"0": [-459.66999999999996, -60], "1": [-60, -50], "2": [-50, -40], "3": [-40, -30], "4": [-30, -20], "5": [-20, -10], "6": [-10, 0], "7": [0, 10], "8": [10, 20], "9": [20, 30], "10": [30, 40], "11": [40, 50], "12": [50, 60], "13": [60, 70]}
[[0, "A", -459.66999999999996, -65], [0, "B", -65, -60], [1, "A", -60, -55], [1, "B", -55, -50], [2, "A", -50, -45], [2, "B", -45, -40], [3, "A", -40, -35], [3, "B", -35, -30], [4, "A", -30, -25], [4, "B", -25, -20], [5, "A", -20, -15], [5, "B", -15, -10], [6, "A", -10, -5], [6, "B", -5, 0], [7, "A", 0, 5], [7, "B", 5, 10], [8, "A", 10, 15], [8, "B", 15, 20], [9, "A", 20, 25], [9, "B", 25, 30], [10, "A", 30, 35], [10, "B", 35, 40], [11, "A", 40, 45], [11, "B", 45, 50], [12, "A", 50, 55], [12, "B", 55, 60], [13, "A", 60, 65], [13, "B", 65, Infinity]]
[["0A", -459.66999999999996, -65], ["0B", -65, -60], ["1A", -60, -55], ["1B", -55, -50], ["2A", -50, -45], ["2B", -45, -40], ["3A", -40, -35], ["3B", -35, -30], ["4A", -30, -25], ["4B", -25, -20], ["5A", -20, -15], ["5B", -15,
@roguh
roguh / colorbrewer_rgb_3int.json
Last active May 17, 2024 19:05
All of Brewer's color themes defined as lists of 3 integers representing RGB colors. Divergent/Sequential type, color theme name, and sequence size is preserved.
{"type":{"Spectral":"div","RdYlGn":"div","RdBu":"div","PiYG":"div","PRGn":"div","RdYlBu":"div","BrBG":"div","RdGy":"div","PuOr":"div","Set2":"qual","Accent":"qual","Set1":"qual","Set3":"qual","Dark2":"qual","Paired":"qual","Pastel2":"qual","Pastel1":"qual","OrRd":"seq","PuBu":"seq","BuPu":"seq","Oranges":"seq","BuGn":"seq","YlOrBr":"seq","YlGn":"seq","Reds":"seq","RdPu":"seq","Greens":"seq","YlGnBu":"seq","Purples":"seq","GnBu":"seq","Greys":"seq","YlOrRd":"seq","PuRd":"seq","Blues":"seq","PuBuGn":"seq"},"Spectral":{"3":[[153,213,148],[255,255,191],[252,141,89]],"4":[[43,131,186],[171,221,164],[253,174,97],[215,25,28]],"5":[[43,131,186],[171,221,164],[255,255,191],[253,174,97],[215,25,28]],"6":[[50,136,189],[153,213,148],[230,245,152],[254,224,139],[252,141,89],[213,62,79]],"7":[[50,136,189],[153,213,148],[230,245,152],[255,255,191],[254,224,139],[252,141,89],[213,62,79]],"8":[[50,136,189],[102,194,165],[171,221,164],[230,245,152],[254,224,139],[253,174,97],[244,109,67],[213,62,79]],"9":[[50,136,189],[102,194
@roguh
roguh / tox.ini
Last active March 29, 2024 22:38
# This demonstrates using tox to test different Python versions and different library versions on select Python versions.
# TODO: use asdf, pyenv, Dockerfile to install many py versions
# Dependencies: aiohttp
# Dev dependencies: pytest pytest-asyncio pytest-cov tox tox-pyenv
[tox]
envlist =
# The oldest Python version we support
# 3.7 is EOL and 3.8 only has 1 more year of security updates
@roguh
roguh / gist:34e93d2568d637be93b2c72695b46abd
Last active July 31, 2023 22:07
Lua resolve hostname with resty.dns.resolver
function resolve_hostname(hostname)
local dns_resolver_lib = require("resty.dns.resolver")
local dns_resolver, dns_resolver_err = dns_resolver_lib:new({
-- Kubernetes default nameserver IP
-- If your hostnames are public, try Google's DNS nameserver 8.8.8.8
nameservers = {"kube-dns.kube-system.svc.cluster.local"},
-- 250 milliseconds
timeout = 250,
retrans = 2