Dyalog APL

Topic Index


&&···························  and 
128-bit Floating Point·······  hexf 
1752·························  British_Calendar_Act_1751 date days gcr 
2-adic numbers···············  bf 
32-bit floating point········  f32 
3D graphics··················  turtle 
3N+1 sequence················  osc 
6174·························  k6174 
91···························  m91 
@····························  at 
]defs························  defs 
abacus·······················  mayan 
ABC··························  baby 
absolute zero················  invr ratsum 
abstraction··················  avl composition dfspan earthlings humour 
accumulator··················  factorial fibonacci list 
ACE··························  baby 
Ackermann's function·········  balm bfack hexdump joy lisp mac 
addition·····················  colsum 
adjacency matrix·············  Graphs 
adjacent 1s··················  xtabs 
AGM··························  see arithmetic-geometric mean 
aide-mémoire·················  refcard 
Algorithm X··················  X 
align text···················  just justify 
alternant····················  alt 
ambivalent···················  ambiv 
Anaglyph·····················  turtle 
ancestor space···············  refpath up 
anti-gravity·················  malaise 
APL'88·······················  mean 
applicative··················  joy 
apportionment················  apportion 
Arithmetic Boundary Checking·  abc 
arithmetic-geometric mean····  limit 
array, nested················  disp easter enlist int 
assembler····················  baby 
assignment···················  apportion assign X 
assignment, destructive······  alists hexdump sam select wpath 
assignment, indexed··········  maze select wpath 
association list·············  alists mns 
Asteroids····················  life 
astronomy····················  mayan 
at operator··················  at 
attributes···················  attrib 
autoformat···················  test 
Baby·························  baby 
bags·························  bags 
balanced ternary·············  bt esh JitSub ratrep ratsum stamps 
balanced tree················  see binary search tree 
Base64 encoding··············  base64 
Bayes formula················  bayes 
Beano························  pigeons 
Beast, number of the·········  rational 
BFS··························  see breadth-first search 
BIDMAS·······················  parse 
bijective numeration·········  adic 
binary·······················  ary 
binary search················  bsearch 
binary search tree···········  avl BST redblack sbst splay 
binding strength·············  parse 
binomial·····················  nats 
birthday·····················  birthday 
biscuit, ginger··············  beyond 
blanks·······················  Blank_removal dab deb dlb dmb dtb dxb mtrim vtrim 
boolean functions············  logic truth_tables 
border·······················  box 
bottom ⊥·····················  baby declarative 
boundary·····················  abc kcell ksphere 
box··························  box disp display draw 
box-drawing characters·······  box dft disp display draw keyboards select 
·····························  wrapnote 
boxing·······················  box disp display dsp 
Brainfuck····················  bf bfack mac 
breadth-first search·········  bfs path search span trav 
BST··························  see binary search tree 
Bunda-Gerth parser···········  kk parse 
Burroughs B1700··············  bt 
cache························  memo 
calendar·····················  British_Calendar_Act_1751 cal date Dates 
·····························  Gregorian_calendar mayan 
calibration··················  wsreq 
canon paschalis··············  easter 
cans·························  decay 
capitalisation···············  von 
card deck····················  ripple 
cartesian coordinates········  polar 
case, upper or lower·········  lcase 
cash prize···················  osc 
cast·························  int 
Catalan number···············  BST 
category·····················  kind 
category theory··············  composition 
cellular automaton···········  life 
Cetacea······················  earthlings 
charisma·····················  charisma 
checksum·····················  chksum 
chess puzzle·················  kt queens queensX 
Cholesky decomposition·······  Cholesky 
classification, name·········  ncpath 
closure······················  cf cfract lisp memo ratsum 
Co-dfns······················  tacit 
co-operator··················  case co_ops cond for fork lof of vof 
coding, fibonacci············  fibonacci 
coins························  decay 
Colemak······················  dvorak 
Collatz sequence·············  osc 
Colossus·····················  baby sufficient 
colour, changing·············  colour_change 
column sum···················  colsum 
combination··················  cmat rr 
combinator···················  dft 
comment removal··············  rmcm 
compare arrays···············  le 
compare functions············  fndiff 
compare namespaces···········  refmatch 
compare workspaces···········  wsdiff 
complex numbers··············  cxdraw polar roots 
component file···············  filefind 
composition··················  composition earthlings humour 
compression··················  dab Data_compression deb dlb dmb dtb dxb nspack 
·····························  pack pack4 packB packD packH packN packQ packR 
·····························  packS packT packU packX packZ squeeze vtrim 
computer programmers·········  nats staples 
computer, first··············  baby 
concatenative················  joy 
conditional operator·········  case cond else for lof logic of until while 
cons·························  list 
consciousness················  composition earthlings muson 
consistency junkie···········  staples 
continuation-passing style···  mac 
continued fraction···········  cfract fibonacci 
convolution··················  xtimes 
coordinates··················  polar 
cost vector··················  wcost 
cover, exact·················  X 
cows and bulls, game of······  mmind 
CPS··························  see continuation-passing style 
cross-reference··············  fnrefs 
currying·····················  parse trav 
custom keyboard··············  kbmac 
Cut··························  Cut 
cylinder·····················  life 
D-function, test for·········  isdfn 
DAG··························  scc 
data compression·············  see compression 
data conversion··············  type 
date·························  Dates days easter Gregorian_calendar mayan 
·····························  timestamp 
debugging····················  tc traj 
decay························  decay 
decimal (from hex)···········  hex 
Decimal Floating Point·······  hexf 
decimal normalisation········  JitSub 
declarative programming······  bfack bt declarative pearly 
default display··············  nlines 
default left argument········  root 
define function··············  din 
defs·························  defs 
denotative···················  declarative 
depth························  Depth 
depth-first search···········  dfspan le scc trav 
derived function·············  dft tacit 
determinant··················  alt det 
DFS··························  see depth-first search 
dictionary···················  alists 
difference, functions········  fndiff 
dip··························  joy 
disassembler·················  baby 
display······················  defs 
display (of arrays)··········  box disp display dsp 
diversions···················  baby dice draw kt life mayan maze mmind mp3 queens 
·····························  quzzle ripple roman sudoku sudokuX von 
division by ¯1 1+base*⍵······  JitSub 
division, fast···············  JitSub 
division, long···············  bt nats 
do-y function················  do 
doors························  charisma 
Dragon curve·················  turtle 
drawing······················  cxdraw 
dual·························  cxdraw 
dup··························  joy 
Dvorak·······················  dvorak 
Dyadic Malaise···············  malaise 
E=MC²························  einstein 
each·························  each 
Earthlings···················  earthlings 
Easter·······················  easter 
EDSAC························  baby 
EDVAC························  baby 
Egyptian fraction············  efract 
Eide numbers·················  esh ratrep ratsum 
EIS··························  see enclose-if-simple 
encapsulate function·········  rep 
enclose-if-simple············  eis 
encoding·····················  utf8get utf8put 
encryption···················  packD 
endian·······················  hexdump hexf 
engineers····················  osc 
ENIAC························  baby 
enlist·······················  avl BST enlist Graphs limit nspack redblack sbst 
·····························  splay 
Entropy······················  shannon 
epistemology·················  composition 
Erasomatic (tm)··············  beyond 
error-guard, dynamic·········  repl 
evaluator····················  lisp 
exa-·························  nats 
exact cover··················  X 
experience, near-death·······  beyond 
expression comparison········  cf cmpx 
expression transformation····  avl cmat nats parse tacit 
external references··········  externs 
external workspace···········  refws 
factorial····················  big factorial lisp nats 
Fast Fourier Transform·······  xpower xtimes 
FFT··························  see Fast Fourier Transform 
fibonacci coding·············  fibonacci 
fibonacci number·············  avl cfract cmat dft fibonacci lisp memo nats pow 
·····························  trav 
find·························  filefind in 
FinnAPL Idiom List···········  bags 
fixpoint·····················  cxdraw JitSub limit tacit 
flip flop (RS)···············  xtabs 
flying machine···············  malaise 
Flying turtle················  turtle 
fold·························  foldl 
fork·························  dft fork tacit vof 
formatting, functions········  dots refmt rmcm 
formatting, trees············  tfmt tnest 
Forth························  joy 
fractal······················  lsys turtle 
FRE··························  see Function Results Edition 
fudge factor·················  wsreq 
function array···············  fnarray fnarray for Function_arrays of rep vof 
function inverse·············  invr 
function power···············  limit pow 
Function Results Edition·····  cf cfract memo ratsum 
function selection···········  for 
function trains··············  dft tacit 
function, fix················  fix 
Functional Kats··············  lsys 
functions, list of···········  lof 
fuzzy························  dist 
Gates, Pearly················  pearly 
Gauss-Jordan·················  gauss_jordan 
Gaussian elimination·········  gauss_jordan 
Gaussian method··············  det 
Gavotte······················  charisma 
GCD··························  see greatest common divisor 
giga-························  nats 
glider·······················  life 
golden mean··················  cfract fibonacci limit phinary 
golfing······················  life 
Gosper curve·················  turtle 
grade························  le ripple 
graph························  alists assign bfs dfspan Graphs inslink insnode kt 
·····························  scc stamps stdists stpath stpaths 
graph, planar················  konigsberg 
graph, unweighted············  gperm Graphs path remlink remnode search span 
graph, weighted··············  Graphs wcost wGraphs wmst wpath wspan 
greatest common divisor······  cfract gcd nats rats 
Gregorian calendar···········  date gcr Gregorian_calendar 
guard························  dice 
guard, adjacent··············  and 
Gödel, Escher, Bach··········  osc 
Haiku························  charisma staples 
Hailstone sequence···········  osc 
Happy Hacking Keyboard·······  dvorak 
harpoon gun··················  ksphere 
Harvard Mk1··················  baby 
hashing······················  chksum 
Haskell······················  declarative scc 
HCF··························  see greatest common divisor 
Heaven·······················  beyond pearly 
Helsingør····················  cond 
hexadecimal··················  esh hex hexdump hexf 
HHKB·························  see Happy Hacking Keyboard 
hidden line removal··········  turtle 
Hilbert curve················  turtle 
Hilbert matrix···············  det gauss_jordan 
histogram····················  cmpx easter nicediv 
hook·························  dft fork tacit 
horizontal tabs··············  xtabs 
Huffman code·················  packH 
humour·······················  humour 
Hungarian method·············  assign 
hybrid·······················  kind 
hyperator····················  bf cf cond hyperators 
hypercube····················  Graphs kcell 
hypersphere··················  kball ksphere 
identity operator············  life 
IDN··························  see International Day Number 
IEEE 754·····················  hexf 
IEEE 854·····················  hexf 
IEEE FP precision············  ary gauss_jordan nats 
imaginary numbers············  see complex numbers 
independent zeros············  assign 
index························  in 
indexing, array··············  from 
infinite precision···········  big colsum nats 
information theory···········  shannon 
inner product················  alt 
insensitive, case············  lcase 
integer······················  int 
intellect, human·············  composition earthlings staples 
International Day Number·····  days 
interval·····················  abc 
inverse······················  invr 
iota, generialised···········  iotag 
is-y function················  do 
J····························  pco 
JFK Airport··················  pearly 
JITS·························  see Just-In-Time-Subtraction 
Joy··························  joy 
Julian calendar··············  Gregorian_calendar 
Just-In-Time-Subtraction·····  JitSub ratrep 
justify text·················  just justify Line_vectors 
K····························  sudoku 
k-adic numbers···············  adic 
K-ball·······················  kball 
K-cell·······················  kcell 
K-sphere·····················  ksphere 
Kaliningrad··················  konigsberg 
Kaprekar's operation·········  k6174 
Karabiner····················  kbmac 
KDF9·························  quotes 
keyboard layout··············  dvorak kbmac keyboards 
kilo-························  nats 
kind·························  kind kk 
klein bottle·················  life 
knight's tour················  Graphs kt 
Koch curve···················  turtle 
Kumquat······················  disp htx 
Königsberg···················  konigsberg 
L-Systems····················  lsys turtle 
lambda expression············  lisp list 
late binding·················  defs 
lazy evaluation··············  and 
LCM··························  see least common multiple 
least common multiple········  gcd nats rats 
Lempel-Ziv-Welch·············  packZ 
lexical scan·················  tokens 
library······················  charisma 
life, game of················  Cut life 
line list····················  see line vector 
line vector··················  justify Line_vectors ltov squeeze unwrap wrap 
·····························  wrapnote 
line-drawing characters······  see box-drawing characters 
lines of output··············  nlines 
link·························  eis 
Lisp·························  lisp 
lists························  alists bf joy list 
loaf, slicing················  ksphere 
local names··················  mean 
location·····················  in 
look-up table················  alists 
loop·························  repl 
Loto, winning················  cal 
lower case···················  lcase 
Lucas numbers················  fibonacci 
LZW··························  see Lempel-Ziv-Welch 
Mac··························  kbmac 
macro························  balm hexdump mac 
magic function···············  declarative 
Malaise, Dyadic··············  malaise 
Manchester computer··········  baby 
Mandelbrot set···············  cxdraw 
manifolds····················  ksphere life 
Mastermind···················  mmind 
mathematicians···············  nats packZ staples 
maximise·····················  assign 
maximum, local···············  ksphere 
maze·························  hampton maze 
media player (MP3)···········  mp3 
mega-························  nats 
memoization··················  memo 
merge, workspace·············  wsmerge 
MESM·························  baby 
Metacircular·················  joy lisp 
MIME·························  base64 
min (workspace)··············  list 
mininum spanning tree········  wmst 
monad························  scc 
monitor······················  profile tc time wsreq 
Morse code···················  morse 
MP3 (media player)···········  mp3 
MST··························  see minimum spanning tree 
multi-graph··················  konigsberg 
multiset·····················  bags 
muscle memory················  dvorak 
muse·························  muson 
music························  mp3 
mutual recursion·············  see recursion, mutual 
möbius strip·················  life 
N-Queens·····················  queens queensX trav X 
name classification··········  ncpath 
name colouring···············  kind kk 
name-clash problem···········  attrib dots find isdfn tree wsdiff 
nameclass····················  kind 
namespace····················  mns Namespaces 
namespace comparison·········  refmatch 
namespace references·········  refpath refs up xrefs 
native file··················  file getfile hexdump int putfile 
natural number···············  nats 
nested array·················  see array, nested 
nesting store················  quotes 
network······················  see graph 
Newton-Raphson···············  invr ksphere limit traj 
Nicaea, Council of···········  easter 
no-result····················  do 
non-termination··············  baby declarative 
nullary······················  joy 
number system················  mayan roman 
offside rule·················  hexdump 
one-liner····················  rmcm 
ontology·····················  composition 
optimise·····················  assign tacit 
order (of arrays)············  le 
OS X·························  kbmac 
Oscillate····················  osc 
oyster·······················  muson 
packing······················  nspack pack4 packB packD packH packN packQ packR 
·····························  packS packT packU packX packZ 
palindrome···················  limit limit turtle 
parent space·················  refpath up 
parsing······················  kk list parse tokens unify 
partioned reduction··········  pred 
partition····················  segs 
Pascal's triangle············  cmat 
passant, en··················  do 
path·························  in stdists stpath stpaths wpath 
pattern-matching·············  bfack bt 
Peano curve··················  turtle 
pencils······················  beyond decay 
pentomino····················  life X 
performance··················  cf cmpx profile sufficient time wsreq 
permutation matrix···········  pmat 
persistent local variable····  memo 
pervasive function···········  easter int perv truth_tables 
peta-························  nats 
Phi··························  see golden mean 
phinary number···············  phinary 
Pi···························  cfract rational 
piano························  ludwig 
pick·························  in 
picnic·······················  ksphere 
pigeons······················  pigeons 
playlist·····················  mp3 
Poincaré Conjecture··········  ksphere 
polar coordinates············  polar 
polyhedron···················  turtle 
polymorphism·················  kk unify 
polynomial···················  ratrep xtimes 
posh·························  ratsum 
postage stamps···············  stamps 
Postscript···················  joy 
power operator···············  pow 
prefix agreement·············  at 
prime number·················  factors hexdump pco rats sieve 
probability··················  birthday 
profiling····················  profile 
programmable function keys···  PF_keys 
proof, engineer's············  osc 
pseudo-graph·················  konigsberg 
pure function················  baby each gauss_jordan queens sam select 
puzzle·······················  quzzle 
QA···························  test 
quad-tree····················  pack4 
quadratic, real roots of·····  roots 
quality assurance············  test 
Quaternion···················  H turtle 
queue························  bfs 
quicksort····················  le 
quickstep····················  dvorak 
QWERTY·······················  dvorak keyboards 
r-pentomino··················  life 
railway diagram··············  file 
rank·························  Depth 
rational number··············  ary cfract esh rational ratrep rats ratsum 
read-eval-print loop·········  see REPL 
rectangle, golden············  phinary 
recursion, mutual············  see mutual recursion 
red-black trees··············  redblack 
redo·························  UndoRedo 
reduction····················  acc foldl 
reference card···············  refcard 
references, function·········  fnrefs 
references, workspace········  refws 
refs·························  refs 
remote execution·············  refws 
REPL·························  din esh hexdump mmind repl 
Representatives, House of, US  apportion 
rewriting····················  bf lsys 
riffle shuffle···············  ripple 
RLE··························  see run-length encoding 
roman numerals···············  roman 
root-space···················  refs 
Round-robin tournament·······  rr 
run-length encoding··········  packR 
SAX··························  alt 
scalar-wise··················  perv 
scan operators···············  scan 
Scheme·······················  lisp 
sea monster, scary···········  dft 
seawater·····················  ksphere muson 
select and modify············  sam 
select operator··············  case 
self-replicating program·····  quine 
selfie·······················  kk quine 
semicolon separator··········  at 
sequence·····················  cfract k6174 osc to traj 
sequential test··············  and 
session input················  din 
Setun computer···············  bt 
Shannon-Fano·················  packS 
sharing, array···············  pack 
shell························  esh repl repl 
shipping regions, UK·········  uksfr 
shortlex·····················  adic 
shuffle······················  ripple 
SICP·························  lisp 
Sierpinski triangle··········  turtle 
sieve························  sieve 
Sigma APL····················  at 
Signum difference············  abc 
simple-array-wise············  saw 
skewed four··················  ratrep ratsum 
Snowflake curve··············  turtle 
sort·························  le 
sound bite···················  declarative humour 
soup·························  decay soup 
spaces·······················  see blanks 
spanning tree················  dfspan span stdists stpath stpaths wmst wspan 
sphere·······················  kball ksphere 
split························  segs 
squab························  pigeons 
SSEM·························  baby 
stack························  joy quotes 
standard deviation···········  mean 
staples······················  staples 
stela························  mayan 
stencil······················  life 
stepping·····················  to 
Stereographic image··········  turtle 
string comparison············  dist 
string replacement···········  fnrepl ss ssmat ssword subs 
string search················  find 
Strongly connected components  scc 
stuff························  Data_compression dots le packN staples 
stupid questions·············  declarative 
subset·······················  subvec 
substitution·················  ss ssmat ssword subs 
subtraction, just-in-time····  JitSub ratrep 
subvector····················  subvec 
sudoku, game of··············  sudoku sudoku_bfs sudokuX X 
suffix trie··················  packZ 
sum··························  colsum 
swap·························  joy 
swons························  joy 
symbol table·················  alists 
syntax·······················  attrib 
tab expansion················  xtabs 
tacit definition·············  tacit 
tag, XML·····················  htx 
tail recursion···············  bfack factorial fibonacci gcd mac 
TAO··························  see Total array ordering 
tape·························  bf dsp parse 
tera-························  nats 
term rewriting···············  bf lsys 
TERNAC·······················  bt 
ternary······················  ary bt 
testing······················  test 
text·························  Blank_removal Data_compression Line_vectors segs 
·····························  unwrap words wrap wrapnote 
text file····················  getfile putfile 
time·························  timestamp 
timing·······················  cf cmpx profile time 
toffee-wrapping paper········  turtle 
topology·····················  abc ksphere 
torus························  ksphere kt life 
Total array ordering·········  le 
trace························  tc 
tradfn·······················  ambiv 
trailing blanks··············  mtrim 
trains·······················  dft tacit 
trajectory···················  traj 
transitive closure···········  Graphs scc wrap 
tree·························  avl dft redblack sbst splay tfmt tnest trav Trees 
·····························  tview 
tree searching···············  kt queens 
truth tables·················  logic truth_tables 
tuple························  scc 
turing complete··············  baby bf 
Turing tape··················  balm bf parse 
Turtle graphics··············  lsys turtle 
type·························  type 
type conversion··············  int 
type notation················  avl BST foldl sbst trav 
unary························  adic joy trav 
under························  cxdraw 
undo·························  UndoRedo 
Unicode······················  getfile iotag putfile utf8get utf8put 
unification··················  unify 
unit circle··················  cxdraw 
unit sphere··················  ksphere 
unit testing·················  test 
UNIVAC·······················  baby limit 
unsigned·····················  int 
upper case···················  lcase 
UTF-8························  utf8get utf8put 
variable-wise················  vwise 
vector of functions··········  vof 
vector-wise··················  rows 
vegan························  soup 
vigesimal number system······  mayan 
Warndorff's rule·············  kt sudoku_bfs 
whales·······················  earthlings 
where clause·················  at 
white dots···················  dots hexdump 
wondrous number··············  osc 
word ladder··················  Graphs 
words························  segs wrap wrapnote 
workspace····················  refws tree Workspaces wsdiff wsmerge 
wrapping, words··············  Line_vectors unwrap 
XML··························  htx 
xutils, ss···················  ss ssmat ssword 
XY language··················  joy 
Y combinator·················  joy lisp 
yotta-·······················  nats 
YouTube······················  dvorak life limit lisp queens sudoku sudoku_bfs 
·····························  trav 
zetta-·······················  nats 
Zuse Z3······················  baby 
Ø····························  see golden mean 
⍳, generalised···············  iotag 
⍺th root·····················  root 
⎕AT··························  attrib 
⎕DR··························  type 
⎕ML··························  cmat cmpx 
⎕NC··························  defs 
⎕NC, extended················  ncpath 
⎕profile·····················  profile 
⎕SE··························  din 
⎕SIZE························  attrib 
⎕WX··························  refs 


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