nk.tsv

SYNTAX	NAME	DESCRIPTION	EXAMPLE
+/x	Sum	Sum all value in x	+/1 2 3 4 5 → 15
-':x	Deltas	Pairwise differences in x	-':1 2 3 4 → 1 1 1 1
|+x	Rotate matrix	Rotate x counterclockwise	|+3 3#!9 → (2 5 8; 1 4 7;0 3 6) 
x@<x	Sort	Sort x	{x@<x}@8 3 7 1 → 1 3 7 8
?x,y	Set Union	Unique elements from x and y	?"abac","adob" → "abcdo"
x^x^y	Intersection	Common elements from x and y	{?x^x^y}["abac";"adob"] → "aba"
x|-x	Absolute value	Absolute value of x	{x|-x}@-1 → 1
*/y#x	Power	x in power of y (y>0)	{*/y#x}[2;5] → 32
y@(#y)!x+!#y	Rotate left	Rotate y by x elements to the left 	{y@(#y)!x+!#y}[3;"abcde"] → "deabc"
`c$x-(32*&97 26)x	Uppercase	Upper case of all alphabetic chars	{`c$x-(32*&97 26)x}@"happy" → "HAPPY"
@[x;i;:;v]	Update	Update value at x[i] with v	a:+`a`b!(0 1 ; 2 3);@[a;0;:;(3,4)] → +`a`b!(3 1;4 3)
|/x	Max, Any	Largest element in x	|/3 5 2 → 5 |/1 0 1 → 1
&/x	Min, All	Smallest element in x	&/3 5 2 → 2 &/1 1 1 → 1
(+/x)%#x	Avg	Arithmetic mean	{(+/x)%#x}@1 2 3 4 5 → 3.0
z@y/(!y@<x)x	Dyadic transpose	x⍉y⍴z	{z@y/(!y@<x)x}[2 0 1; 2 3 4; `c$"A"+!24] → "AMBNCODPEQFRGSHTIUJVKWLX"