Index to wiki QIdioms page

If you knew a QIdiom by its number, you can look it up here.

QIdiom #	now	description
1	1701	ordinals (ranking, shareable)
2, 3, 5, 7, 15	1312	apply uniform function to each part
4	2107	are x and y permutations of each other?
5b, 296	1305	start indexes from lengths
6, 14, 491, 492	1313	aggregate each part
8, 9, 18, 19, 35, 38, 44	1705	sort x
10, 51	1617	depth (rank) of an array
11, 12, 31, 482	1714	mesh: merge x y z under control of g
13, 17	1700	ordinals (ranking, all different)
16	1713	merge x y by g
20, 346	2127	is x a permutation?
21	1311	rotate each part
22, 336	505	first occurrence of minimum
23, 330	504	first occurrence of maximum
24	1807	median of x
25	1911	double quotes
26	2207	insert y "*" after "="
27	1332	insert 0 after indexes y
28	1333	insert g copies of h after indexes y
29	1334	insert g copies of h before indexes y
30	1703	grade up x according to key y
32	1708	sort ascending indexes x according to data y
33	1707	sort rows of x on column y
34	1702	choose grading direction
36	1706	sort y on x
37, 550, 553	1004	invert permutation
39, 40	1310	reverse each part
41, 280, 506	501	flags
42, 43	1709	move flagged items to one end
45	200	binary from integer
46	700	formatted integers
47	1400	polynomial with roots x
48	1016	saddle-point indexes
48a	1017	flag row minimums
48b	1018	flag column maximums
48c	1019	flag minmaxs
48e	1020	row-column indexes of ravel-indexes y in matrix x
49	202	hexadecimals from integers
50	1005	connectivity list from connectivity matrix
51	904	indexes of an array
51b	1501	shape of an array
51	1618	shape of an array
52, 59, 60	11001	truth table of order x
53	204	decimal digits from integer
54	205	integer in base y
55	514	items of y in array x
56	203	hexadecimals from decimal characters
57	208	vector from date
58	903	all pairs of til[x] and til[y]
61	1215	cyclic counter
62	142	integer and fractional parts of positive x
63	206	integer in base 10 100 1000
64	707	time hhss from integer hhmmss
65	708	date yyyy/mm/dd from integer yyyymmdd
66	1236	selection by encoded list
67	1409	extrapolated value of abscissa x and ordinate y at g
69, 227	1403	value of ascending polynomial coefficients y at points x
70, 206, 327	2209	remove duplicate rows
71	1006	connectivity matrix from connectivity list
72	209	integer from date
73, 266, 272, 298, 397, 428	1902	remove trailing blanks
74	2001	days in month x of Gregorian year y
75	207	integer from hexadecimal
76, 275	1907	justify right
77	400	present value of cash flows c at times t and discount rate d
78, 95	210	number from string
79, 217	517	last non-blank
80, 522	905	scattered indexing
81	906	raveled index from general index
82	401	future value of cash flows
84	201	integer from binary
85, 519	2109	is matrix x antisymmetric?
86, 520	2108	is matrix x symmetric?
87	703	number of decimals
88	1219	name variable according to x
93	214	numbers from text matrix
94	211	number from string, default y
96, 115, 116, 117	300	case structure
98	306	execute rows of character matrix
99	215	numbers from evaluating rows of text matrix
100	907	index an arbitrary-rank array
101	307	sum numbers in character matrix
104	2002	date in ascending format
105	2003	current time of 12-hour clock
106	702	leading zeros for positive integers in field width y
107	2004	current date, American format
111	701	count of format
121	1222	y-shaped array of numbers from x[0] to x[1]-1
122	1220	y items selected with replacement from til x
123	1221	y objects selected without replacement from til x
123.1	1810	normal deviates from interval (0,1)
124	1407	predicted values of exponential fit
125	1405	predicted values of best linear fit (least squares)
126	1408	G-degree polynomial fit of points (x,y)
127	1406	coefficients of exponential fit of points (x,y)
128	1404	coefficients of best linear fit of points (x,y) (least squares)
129	806	arctangent y÷x
131	807	complementary angle (arccos sin x)
132	808	rotation matrix for angle x (in radians) counter-clockwise
133	801	degrees from radians
134	802	radians from degrees
135	1002	number of permutations of n objects taken k at a time
136, 1007	1012	Pascal’s triangle
137	1026	Taylor series
139	1000	Beta function
142	1001	number of combinations of n objects taken k at a time
143	509	distinct items
144	710	histogram
145	1214	count of x between endpoints (l,h)
146	402	compound interest for principals y at percentages g for periods x
147, 219	518	string x in string y
148	1007	node matrix from connection matrix
149	704	number of decimals, maximum y
150	103	sum items grouped by y
151	304	efficient execution of f x where x has repeated values
152	1244	sum items of y by ordered codes g in x
153	515	rows of y in in corresponding rows of x
154, 422, 505	1228	range; nub; remove duplicates
155	131	greatest common divisor
156	1710	sort y by value into x classes
157	1008	connection matrix from node matrix
159, 214, 215, 311, 315, 316, 317, 324, 340, 341, 343, 347, 349, 352, 354, 358	2115	is range of x 1?
160	1906	move blanks to end
161	2110	is x upper triangular?
162	2111	is x lower triangular?
163	1401	polynomial product
164, 468	130	divisors
165, 540, 543	610	vector length x with 1s at y
166	711	barchart of integer list
167	614	1s preceded by 0s
168	613	0s followed by 1s
169, 172, 407	612	1s followed by 0s
170	713	horizontal barchart, normalized to length y
171	712	horizontal barchart of integers
173	1712	assign x to one of y classes of width h, starting with g
174	1218	move x into first quadrant
175	138	primes to n
177	1914	ordinal of word in x pointed at by y
177	1915	find start of string x in string y
178	1916	find first occurrence of string x in string y
179	809	contour levels y at points with altitude x
180	2117	are items in interval [y)?
181	1711	which class of y x belongs to
182	512	consecutive repeated items
183	133	maximum table
184, 412	2201	right-justify fields of length y to length g
185, 276	2200	left-justify fields of length y to length g
186	403	annuity coefficient for x periods at interest rate y%
187	125	direct matrix product
188	11015	Shur product
189, 190	104	add vector to each row of matrix
191	11016	Shur sum
192, 193	105	add vector to each column of matrix
195	11002	upper triangular matrix of order x
196	11003	lower triangular matrix of order x
197, 582	11004	identity matrix of order x
198	11005	Hilbert matrix of order x
199	119	multiplication table of order x
200	1605	replicate a dimension of rank-3 array x y-fold
201	901	y-wide sublists of x
202, 249, 268	902	sublists of length y, starting at x
203, 534, 594	1509	1-column matrix from vector
204	114	numeric array and its negative
205	2214	remove trailing blank rows
207	513	rows of matrix y in matrix x
209	2217	remove trailing blank columns
210	2216	remove leading blank columns
211	2213	remove leading blank rows
213	1314	maximums of parts flagged by y
216	2204	rows starting with y
218, 220	2211	collapse whitespace
221	2118	are items integers in interval [g,h)?
222	1802	maximum of x with weights y
223	1804	minimum of x with weights y
224	11011	extend distance table to next leg
225	2212	remove blank rows
226	2215	remove blank columns
228, 229, 232	2112	is y a row of x?
230	11012	extend a transitive binary relation
231	2205	rows with items different from y
233	2119	are items in interval [ y )?
234, 235	2120	are items in interval ( y ]?
236, 362	1213	count occurrences of x in y
237	1806	average (mean) of x weighted by y
239	107	sum reciprocal series
240	126	matrix product
241	108	sum over subsets of x specified by y
242, 246	109	sum squares
243	127	dot product of vectors
244	128	product over subsets of x specified by y
245	1223	randomize the random seed
247	616	interlace 1s and 0s
248, 323, 393	1908	center text x in line of width y
250, 251, 253	1606	replicate y x times
252	617	alternate takes of 1s and 0s
254	1323	running parity of parts flagged by y
255	1318	running sums of parts flagged by y
256, 292	1324	groups of 1s flagged by y
257	1315	sums of parts with lengths y
259	1904	remove leading and trailing blanks
260	140	first 10 figurate numbers of order x
261	633	first group of 1s
262	1021	value of saddle point
264, 271	1922	insert x[i] blanks after y[g[i]]
265, 279	1325	insert 0s after each part
267, 299	1903	remove leading blanks
268, 270	2123	are items in ascending order?
273, 274	1607	join atom to each list item
277	1303	end flags from lengths
278	1302	start flags from lengths
281	1027	value of Taylor series with coefficients y at x
282	516	first blank
283	1320	find part y of parts beginning with first of x
284	1316	sums of parts grouped by y
285	1812	moving sum
286	404	fifo stock y decremented with x units
289	1326	or-scan of parts flagged by y
290	1327	and-scan of parts flagged by y
291	1317	sums of parts flagged by y
293	1917	locate quotes and text between them
294	1918	locate text between quotes
295	1919	depth of parentheses
297	1923	spread flagged field heads right
300	1328	gth part flagged by y
301	111	alternating sum series
302	139	x first triangular numbers
303	604	smearing 1s between pairs of 1s
304	600	invert 0s after first 1
305	605	invert fields marked by pairs of 1s
306	603	invert 1s after first 0
307	601	invert 1s after first 1
308	602	invert 0s after first 0
309	632	running parity
310	1811	running sum
312	1010	maximum separation of items of x
313, 314	11014	value of two-by-two determinant
318	805	area of triangle with sides x (Heron’s rule)
319	1808	standard deviation
320	1809	variance (dispersion)
321	1410	y-th moment of x
325, 326, 332, 364, 365	1805	average (mean)
328	1611	count items count x
329	618	flag positive integers
331	147	identity for floating-point maximum, negative infinity
333	2101	quick membership for non-negative integers
334	1801	non-negative maximum max 0,x
335	1800	maximum
337	148	identity for floating point minimum, positive infinity
338	503	first occurrence of y
339	1803	minimum
342	213	integer from Roman
344	2106	pairwise match
345	2100	do ranges of x and y match?
348	2102	do x and y have items in common?
350	2116	are items 1s and 0s only (boolean)?
351	2103	is x a subset of y?
353	2124	are items unique?
355	626	none
356	625	any
357	2104	does x match y?
359	519	blank rows
360	624	all
361	631	simple parity
363	1015	quadraticsolution
366	1612	count atoms
367	124	alternating product
368	118	product
369	110	alternating sum
370	619	count 1s
371, 616	1502	atom from 1-item vector
372	101	sum columns of matrix
373	102	sum rows of matrix
374	100	sum a vector
375	1217	insert row x in matrix y after row g
376	1608	append y at the bottom of matrix x
377	1609	fill x to length y with x’s last item
379	1227	remove leading, multiple and trailing ys from x
380, 425	1205	replace items of x with value y[0] with y[1]
381	606	invert all but first 1 in group of 1s
382	1216	insert x in y after index g
383, 420	116	pairwise difference
384	1237	drop first, suffix 0
385	1238	drop last, prefix 0
386	1239	shift x right y, fill 0
387	1240	shift x left y, fill 0
388, 444	1620	drop first y rows from top of matrix x
389	1704	playing order of x ranked players
390	1600	conform table x rows to list y
391	1601	conform table x columns to list y
392, 402	1506	1-row matrix from atom or vector
396	1624	remove columns y from x
398	11008	diagonals from columns
399	11009	columns from diagonals
401	1920	first word in string x
404	1308	end indexes for x fields of length y
405	1307	start indexes for x fields of length y
406	106	add x to last item of y
408, 513	11006	empty row to start matrix of x columns
410, 445, 600	1615	count columns in matrix x
411, 446	1614	count rows in matrix x
414	1306	end indexes from lengths
415	620	lengths of groups of 1
417	1322	end indexes of equal-item parts
418	1321	start indexes of equal-item parts
419	132	pairwise ratios
423	1309	lengths from start indexes
424	1905	collapse multiple blanks
426	2202	collapse multiple occurrences
429	1513	matrix with diagonal x
430	1402	polynomial derivative
431	2126	does item differ from next one?
432	1206	replace first item of x with y
432	2125	does item differ from previous one?
433	1207	replace last item of x with y
437	1912	remove leading zeros
438	622	first 1 after index y
439	635	last 1s in groups of 1s
440	634	first 1s in groups of 1s
441, 613	2203	comma-separated list from matrix
442	115	first difference
443	1621	drop first y columns from matrix x
447	1622	conditional drop of y items from list x
448	1623	conditional drop of last item of list x
449	1208	limiting x between l and h, inclusive
450	1211	arithmetic precision of system in decimals
451	137	arithmetic progression from x to y with step g
452, 455	706	number of positions in integer
453	409	round to nearest even integer
454	410	round, but to nearest even integer if fractional part is 0.5
456	705	number of positions in nonnegative integer
457	2113	are items integral?
459	145	leading digit of numeric code abbb
460	408	round y to x decimals
461	407	round to two decimal places
462	406	round to nearest integer
463	2000	is year x a leap year?
464	2206	frame character matrix
465	143	magnitude of fractional part
466	1225	remove every y-th item of x
467	1232	select every y-th item of y
469	1226	remove every second item
470	1233	items of x divisible by y
471	506	first occurrence of g (circularly) after y
473	2114	are items even?
474	412	round x to zero if magnitude less than y
475	112	increase absolute value without sign change
476	144	fractional part with sign
477	120	square x retaining sign
478	141	fractional part
479	146	last part of abbb
480, 481, 483	1201	zero items of x not in y
484	1229	right to left scan
485	2218	append empty row
487	2219	insert empty row after row y
489	2208	matrix from string at parts flagged by x
490, 580	1909	insert spaces in text
493	301	choose x or y depending on flag g
495, 503	502	all occurrences of y in x
496	1913	remove punctuation characters
497	1022	set union
498	1023	set difference
499	520	rows starting with item of y
500	1024	set intersection
504	1204	replace items of y flagged by x with g
507	1921	insert blank in y after flag in x
508	1910	conditional text
509	1224	remove y from x
510	1901	remove blanks
511	1210	apply f over all of x
512	636	select items flagged by y
514	11000	apply to dimension 1 function defined on dimension 0
516	121	multiply each column by vector
518	1625	transpose matrix x on condition y
521	1512	x-column matrix from vector y
525, 526	11007	main diagonal
527	1626	transpose planes of three-dimensional x
528	123	vector (cross) product
529	609	flags at y for vector x
530, 531	507	last occurrence of y
532	508	last occurrence of y, counted from the rear
533	302	reverse on condition y
535	1212	avoid parentheses using reverse
536	1241	rotate rows left
537	1242	rotate rows right
538	607	insert 0 in list of 1s x after indexes y
539	611	vector length y with 0s at x
544	2105	do x and y match?
545	1202	zero items of x not in y
546	2128	is count of atoms 1?
547	2129	is x a vector?
548	2130	is x empty?
549	1900	alphabetic comparison
551	510	first differing item of x and y
552	511	items not in y
554	1234	select from g based on index of x in y
555	1619	all axes of rectangular array x
556	900	all indexes of vector x
557	136	arithmetic progression of y numbers from x with step g
558	135	consecutive integers from x to y
559	621	first 1 in x
561	212	numeric codes from string
562	500	y in x
563	1602	empty vector
564	2121	are items in interval ( y[0],y[1] )
565	2122	are items in interval [ y[0],y[1]
566, 624	608	zero all items
567	1235	select x or y depending on g
569	1203	replace items of y flagged by x with 1
570	627	x implies y
571	628	x but not y
572	129	divide by 0
573	629	exclusive or
574	1230	y where x is 0
575	630	Kronecker deltax=y
576	1331	prepend y items of g to each item of x
577	1330	append y items g to each item of x
578	1715	merge items from x and y alternately
579	2210	variable length lines
581	1329	insert y after each item of x
583, 621	113	vector and its negative
587	11013	first column as a matrix
588	1507	2-row matrix from two vectors
589	1510	2-column matrix from two vectors
590	1514	increase rank of y to rank of x
591	1511	2-column matrix from vector
592	1503	vector from array
593	1508	y-row matrix from vector x
595	1505	1-row matrix from vector
599	1616	count columns in array x
602	1231	select from y according to sign of x
603	303	conditional change of sign
605	709	indexing plotting characters with flags
607	1504	vector from column y of matrix
608	117	zeroing an array
610	1603	y cyclic repetitions of vector x
611	122	multiply each row by vector
612	1500	rank of an array (number of dimensions)
614	1604	array with shape of y and x as its rows
615	1613	first atom in x
622	1200	zero items of x not flagged by y
623	1209	change sign of y where x is 1
629	305	error to stop execution
1001	405	payback
1002	413	round summands
1003	1319	maximum sum of parts
1004	1025	range union
1005	1013	pointer chasing
1006	1011	partitions of y with no part less than x
1008	1014	polygon area
1009	804	great circle distance
1010	803	nautical miles from radians
1011	800	degrees from degrees and minutes
1012	1009	first y Fibonacci numbers
1013	1627	tree from depth;value
1014	1628	depth from tree
1015	1629	value from tree
1016	1243	streak of numbers with same sign
1017	1003	permutations