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NB. This problem was read in  the blogpost (https://www.glc.us.es/~jalonso/exercitium/numeros-libres-de-cuadrados/) of @Jose_A_Alonso.
NB. Problem statement: given a positive integer N, it's called square-free if no square number (eg 2^2, 11^11) can be created from its prime divisors.
NB. Created using the J903 online playground (https://jsoftware.github.io/j-playground/bin/html2/). 

NB. Let's get the matrix of the prime divisors of an array of integers
q: @>  10 30 40 1000 11 121
NB.  2  5 0 0 0 0
NB.  2  3 5 0 0 0
NB.  2  2 2 5 0 0
NB.  2  2 2 5 5 5

mlliarm

Multiple keyboard layouts on RaspberryOS 64 bit, Debian Bullseye

Issue

The issue is that if one follows the usual steps, the keyboard layout handler doesn't change the layouts. It's a very well known issue.

Solution

From the above link, and most specifically this post, the solution is as follows:

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# Credit to `oskar31415` from the r/APLjk discord server for sharing the code and his friend for writing it.
 '''
 Original code:
 
 (lambda N,P:(lambda f,i:P.show(__import__('matplotlib.animation',fromlist=['FuncAnimation']).FuncAnimation(f,lambda i:[i.set_array((lambda g:(lambda n:N.logical_or(n==3,N.logical_and(g,n==2)))((N.sum([N.roll(N.roll(g,y,1),x,0)for x in(-1,0,1)for y in(-1,0,1)if x|y],0))))(i.get_array())),[i]][1],interval=0,blit=1)))(P.figure(),P.imshow(N.random.rand(200,400)<.2,)))(__import__("numpy"),__import__("matplotlib.pyplot")) 
 '''
 
 # Expanded by mlliarm@
 import pdb    
 try:

mlliarm

Electron apps

• Marp: Markdown presentation ecosystem.

• muryoimpl/slippr: markdown presentation app by Electron

• joe-re/cafe-pitch Markdown-driven presentation tool built on Electron.

Slide deck frameworks supporting Markdown source

mlliarm

Nice email clients for GNU/Linux

Evolution

• Better than Thunderbird.
• https://wiki.gnome.org/Apps/Evolution

Mutt

• CLI based.

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Youtube from the Linux CLI

I really love listening to music when programming, on my old Linux laptop.

So, to save resources I looked for a CLI Youtube app. And there is an amazing one.

Enter yewtube

• Yewtube is a fork of mps-youtube. Find yewtube here. Follow the instructions in the README.md file to install it.
• Suggestion: install it within a virtual environment (virtualenv).

mlliarm

How to use RSS to get updates from Twitter hashtags

Websites

• https://feeder.co/knowledge-base/rss-feed-creation/twitter-rss-feeds/
• https://www.tecmint.com/best-rss-feed-readers-for-linux/

Tools

From the above websites I found after some testing that the most reliable and useful in the 'free' tier are:

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Factoring 10...01

Tools

GNU/Linux factor Bash tool and python3.

Code & results

# bash shell
 $ factor 101

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//header
#pragma GCC target ("avx2")
#pragma GCC optimize ("O3")
#pragma GCC optimize ("unroll-loops")
#include <bits/stdc++.h>

using namespace std;
typedef long long int ll;
typedef long double ld;

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Table Of Content

Skip to the relevant sections if needed.

• 2-min tutorial to do it the quick-and-dirty-way
• Concepts for resolving Git conflicts
• Setting up different editors / tool for using git mergetool
  • Finding out what mergetool editors are supported
• mergetool simple code example for vimdiff
  • Resolving conflict from a Git pull
• Other great references and tutorials