Is this matrix rank-one?
code-golf
Your goal is to check whether a given integer matrix is rank-one, using as few bytes as possible. A matrix is rank-one if every row is a multiple of the same vector.
Example:
2 4 20 10
-3 -6 -30 15
0 0 0 0
The definition also holds true ...
Rinderkennzeichnungs- und Rindfleischetikettierungsüberwachungsaufgabenübertragungsgesetz listen (RkReÜAÜG) (literally, Cattle marking and beef labeling supervision duties delegation law) was a law of the German state of Mecklenburg-Vorpommern of 1999, repealed in 2013.
It dealt with the supervision of the labeling of beef.
The name is an example of the virtually unlimited compounding of nouns that is possible in many Germanic languages. German orthography uses “closed” compounds, concatenating nouns to form one long word. This is unlike most English compounds, which are separated using spaces...
Make a Space Heater
I've been out shoveling snow all day, and my hands are freezing! Heat them up with my computer.
Here's an (ungolfed) Linux C solution:
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <sys/prctl.h>
#include <sys/wait.h>
#include <sys/sysinfo.h>
int ...
In combinatorial mathematics, a De Bruijn torus, named after Nicolaas Govert de Bruijn, is an array of symbols from an alphabet (often just 0 and 1) that contains every m-by-n matrix exactly once. It is a torus because the edges are considered wraparound for the purpose of finding matrices. Its name comes from the De Bruijn sequence, which can be considered a special case where n is 1 (one dimension).
One of the main open questions regarding De Bruijn tori is whether a De Bruijn torus for a particular alphabet size can be constructed for a given m and n. It is known that these always exist when...
11
Perl 6 (93 101 100 80 68 66 bytes)
$/=split ".",get;say ($0+($1+$2/(9 x$2.comb||1))/10**$1.comb).nude
The size was increased to handle nothing, instead of just failing. Mouq proposed to use $/, so it's now being used, and the code is 20 bytes shorter. Ayiko proposed replacing / with , so the c...
