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Sum of the first n elements of the triangular sequence
Let's consider the following sequence:
$$0,1,3,6,10,15,21,28,36,45,55,66,78,91,105,120,136,153,171,190,210,231,253,276, 300...$$
This is the sequence of triangular numbers (A000217 in the OEIS) defined as: $$a(n) = binomial(n+1,2) = n*(n+1)/2...
BETA is a pure object-oriented language originating within the "Scandinavian School" in object-orientation where the first object-oriented language Simula was developed. Among its notable features, it introduced nested classes, and unified classes with procedures into so called patterns.
The project is inactive as of October 2020.
== Features ==
=== Technical overview ===
From a technical perspective, BETA provides several unique features. Classes and Procedures are unified to one concept, a Pattern. Also, classes are defined as properties/attributes of objects. This means that a class cannot be...
The Alpha language was the original database language proposed by Edgar F. Codd, the inventor of the relational database approach. It was defined in Codd's 1971 paper "A Data Base Sublanguage Founded on the Relational Calculus". Alpha influenced the design of QUEL. It was eventually supplanted by SQL (which is however based on the relational algebra defined by Codd in "Relational Completeness of Data Base Sublanguages"), which IBM developed for its first commercial relational database product.
== References ==
== See also ==
QUEL query languages
Alef is a discontinued concurrent programming language, designed as part of the Plan 9 operating system by Phil Winterbottom of Bell Labs. It implemented the channel-based concurrency model of Newsqueak in a compiled, C-like language.
== History ==
Alef appeared in the first and second editions of Plan 9, but was abandoned during development of the third edition. Rob Pike later explained Alef's demise by pointing to its lack of automatic memory management, despite Pike's and other people's urging Winterbottom to add garbage collection to the language;
also, in a February 2000 slideshow, Pike noted...
0
Your input is a matrix (2d array) of positive integers. For example:
\begin{matrix}
1 & 1 & 4 & 7\\
1 & 3 & 5 & 6\\
2 & 1 & 4 & 5 \\
\end{matrix}
A semi-continuous transformation of this matrix is a rearranging of elements that preserves immediate neighbors. For example, we can swap the \$2\$ in ...
Your regex will receive a string of the form
!XX!
#<extra>
where X is any hexadecimal digit (0-9 and A-F capital letters only), and <extra> is a character sequence to your choosing. (perhaps something like 0123456789ABCDEF0 could be useful?)
You may use any regex flavour.
Scoring will be calcul...
Draw an ASCII Volume
code-golf ascii
Given a volume level V in the range 1-10. Your program should draw the following ASCII art.
When V=1:
\
|
/
When V=2:
\
\ |
| |
/ |
/
When V=3:
\
\ |
\ | |
| | |
/ | |
/ |
/
And etc. Trailing spaces are allowed.
This is a code-golf ...00:00 - 15:0015:00 - 00:00
