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Anonymous
Anonymous
Anonymous
Let's start by re-defining a reflection of a character in a 2-d array of characters:
Given a square 2-d array of characters with distinct lowercase alphabetical letters, define a reflection of a letter in the matrix as swapping it with the character directly across from it through the center ...
Swapping two elements in a vector/matrix is very simple in Octave:
x='abcde';
x([4,1])=x([1,4])
x =
dbcae
Unfortunately, I have yet to find a way to do this inside an anonymous function. While the function below is syntactically correct, it only gives back the two elements that are swapped...
Blindfolded Arithmetic
Possibly a fairly easy language to start off with, relatively
speaking. (There are limits on how difficult a language I can make
because I have to prove it Turing-complete myself!)
For this language, the program set is the set of Blindfolded
Arithmetic programs as given ...
In mathematics, a complex square matrix U is unitary if its conjugate transpose U∗ is also its inverse—that is, if
U
∗
U
=
U
U
∗
=
I
,
{\displaystyle U^{*}U=UU^{*}=I,}
where I is the identity matrix. In physics, especially in quantum mechanics, the Hermitian conjugate of a matrix is denoted by a dagger (†) and the equation above becomes
U
...
Here's an interesting sequence discovered by Paul Loomis, a mathematician at Bloomsburg University. From his page on this sequence:
Define
f(n) = f(n-1) + (the product of the nonzero digits of f(n-1))
f(0) = x, with x as any positive integer, written in base 10.
So, starting with f(0)=1, you ge...
cat /proc/cpuinfo reports that the avx2 flag is set.
However, the AVX2 instruction vpbroadcastb causes an illegal instruction exception when ran.
I am using x86_64 Linux and nasm as my assembler. On my system, reproducing this is as simple as
global main
main:
vpbroadcastb %ebx,%xmm1
using ...
Background
The Royal Netherlands Meteorological Institute defines a heat wave* as a series of at least 5 consecutive days of ≥25°C weather (“summery weather”), such that at least 3 of those days are ≥30°C (“tropical weather”).
*(Well, by Dutch standards.)
Challenge
Given a non-empty list of p...
Are there Infinitely Many Power Means that are Integers?
Input: a list a of n positive integers.
Let M_p be equal to the pth root of 1/n * (a[0] + a[1] + ... + a[n-1]), where p is an integer.
Where p is equal to zero, M_p is equal to the geometric mean of the integers in a, since M_p actually ...
Sequences in π and e
code-golf pi e transcendental-numbers
Your task is simple: take as input a positive integer n. Print or return the longest sequence of digits that appears in the first n decimal digits of BOTH pi (3.14159...) and e (2.71828...). The ones-place digits, 3 and 2, are included....00:00 - 23:0023:00 - 00:00
