Paraphraser

Checking your Raspberry Pi's view of its power supply

Sometimes it seems like the first (and sometimes only) advice you get offered for almost any problem with a Raspberry Pi is "check your power supply". You think something like:

"hey, I'm using an official power supply sold as being matched with my Pi so how can there be any problem?"

You look up the specs then stick a controlled load across your supply and confirm that it can deliver the required number of Watts.

Yet your problems persist…

tanho63

library(tidyverse)

scooby_data <- read.csv("https://raw.githubusercontent.com/rfordatascience/tidytuesday/master/data/2021/2021-07-13/scoobydoo.csv")

x <- 
  scooby_data %>% 
  select(season, title, 
    starts_with("caught"),
    starts_with("captured"),
    starts_with("unmask"),

geek-at

#!/bin/bash

while :; do

    verf=$(cat /dev/urandom | tr -dc '0-9' | fold -w 8 | head -n 1)
    pin=$(cat /dev/urandom | tr -dc '0-9' | fold -w 5 | head -n 1)

    ip=$(printf "%d.%d.%d.%d\n" "$((RANDOM % 256))" "$((RANDOM % 256))" "$((RANDOM % 256))" "$((RANDOM % 256))")

nileshtrivedi

Raspberry Pi on Internet via reverse SSH tunnel

HackerNews discussed this with many alternative solutions: https://news.ycombinator.com/item?id=24893615

I already have my own domain name: mydomain.com. I wanted to be able to run some webapps on my Raspberry Pi 4B running perpetually at home in headless mode (just needs 5W power and wireless internet). I wanted to be able to access these apps from public Internet. Dynamic DNS wasn't an option because my ISP blocks all incoming traffic. ngrok would work but the free plan is too restrictive.

I bought a cheap 2GB RAM, 20GB disk VM + a 25GB volume on Hetzner for about 4 EUR/month. Hetzner gave me a static IP for it. I haven't purchased a floating IP yet.

satijalab

#!/usr/bin/env Rscript

# Detach any thing for Seurat
if ('package:Seurat' %in% search()) {
  detach(name = 'package:Seurat')
}

if ('Seurat' %in% loadedNamespaces()) {
  unloadNamespace(ns = 'Seurat')
}

jblachly

1. Make sure configure can find sys/stat.h:

Modify bcl2fastq/src/cmake/macros.cmake

Find the last block:

#
# Macro to find libraries, with support for static-only search
#
macro(bcl2fastq_find_header_or_die variable file)

joyrexus

collapsible markdown?

CLICK ME

yes, even hidden code blocks!

print("hello world!")

p1nox

sudo apt-get update
sudo apt-get install zlibc
sudo apt-get install libc6
sudo apt-get install gcc
sudo apt-get install g++
sudo apt-get install libboost1.55-all-dev
sudo apt-get install cmake

klmr

A little experiment using restarts.

(And while we’re at it, let’s torture R’s syntax a little.)

![screenshot][]

In the following we will be using R’s “restarts” feature to implement the state machine that drives generators in languages such as Python. Generators allow lazily generating values on demand: a consumer invokes a generator, and consumes values as they are produced. A new value is only produced once the previous one has been consumed.

russellpierce

library(parallel)

saveRDS.xz <- function(object,file,threads=parallel::detectCores()) {
  pxzAvail <- any(grepl("(XZ Utils)",system("pxz -V",intern=TRUE)))
  if (pxzAvail) {
    con <- pipe(paste0("pxz -T",threads," > ",file),"wb")
    base::saveRDS(object, file = con)
    close(con)
  } else {
    saveRDS(object,file=file,compress="xz")