different between array vs group

English

Etymology

From Middle English arrayen, from Anglo-Norman arraier (compare Old French arraier, areer (“to put in order”)), from Medieval Latin arr?d? (“to put in order, arrange, array”), from *r?dum (“preparation, order”), from Frankish *reida (“preparation, order”) or Gothic ???????????????????????????? (garaiþs, “ready, prepared”), from Proto-Germanic *raidaz, *raidiz (“ready”). Doublet of ready.

Pronunciation

• IPA^(key): /???e?/
• (US) IPA^(key): /???e?/, /?æ.????/ (UK)
• Rhymes: -e?

Noun

array (countable and uncountable, plural arrays)

1. Clothing and ornamentation.
2. A collection laid out to be viewed in full.
3. An orderly series, arrangement or sequence.
   • 1856-1858, William H. Prescott, History of the Reign of Philip II

     But the chivalry of France was represented by as gallant an array of nobles and cavaliers as ever fought under the banner of the lilies

4. Order; a regular and imposing arrangement; disposition in regular lines; hence, order of battle.

   drawn up in battle array

   • wedged together in the closest array

5. A large collection.
   • 1814, Lord Byron, The Corsair

     their long array of sapphire and of gold

   We offer a dazzling array of choices.
6. (mathematics) Common name for matrix.
7. (programming) Any of various data structures designed to hold multiple elements of the same type; especially, a data structure that holds these elements in adjacent memory locations so that they may be retrieved using numeric indices.
8. (law) A ranking or setting forth in order, by the proper officer, of a jury as impanelled in a cause; the panel itself; or the whole body of jurors summoned to attend the court.
9. (military) A militia.
10. A group of hedgehogs.
11. A microarray.

Usage notes

• (any of various data structures): The exact usage of the term array, and of related terms, generally depends on the programming language. For example, many languages distinguish a fairly low-level "array" construct from a higher-level "list" or "vector" construct. Some languages distinguish between an "array" and a variety of "associative array"; others have only the latter concept, calling it an "array".

Antonyms

• (orderly series): disarray

Hyponyms

Related terms

Translations

References

See also

• (any of various data structures): ones-based indexing, zero-based indexing

Verb

array (third-person singular simple present arrays, present participle arraying, simple past and past participle arrayed)

1. To clothe and ornament; to adorn or attire.
2. To lay out in an orderly arrangement; to deploy or marshal.
3. (law) To set in order, as a jury, for the trial of a cause; that is, to call them one at a time.

Synonyms

• (to clothe and ornament): don, dress, put on; see also Thesaurus:clothe or Thesaurus:decorate

Translations

Portuguese

Etymology

From English array.

Noun

array m (plural arrays)

1. (programming) array (any of various data structures)

   Synonym: vetor

English

Alternative forms

• groop (non-standard)
• groupe (obsolete)

Etymology

From French groupe (“cluster, group”), from Italian gruppo, groppo (“a knot, heap, group, bag (of money)”), from Vulgar Latin *cruppo, Renaissance Latin grupus, from Proto-Germanic *kruppaz (“lump, round mass, body, crop”), from Proto-Indo-European *grewb- (“to crumple, bend, crawl”). Cognate with German Kropf (“crop, craw, bunch”), Old English cropp, croppa (“cluster, bunch, sprout, flower, berry, ear of corn, crop”), Dutch krop (“craw”), Icelandic kroppr (“hump, bunch”). Doublet of crop and croup.

Pronunciation

• enPR: gro?op, IPA^(key): /??u?p/
• Rhymes: -u?p

Noun

group (plural groups)

1. A number of things or persons being in some relation to one another.

2. (group theory) A set with an associative binary operation, under which there exists an identity element, and such that each element has an inverse.
   • 1977, Roger C. Lyndon, Paul E. Schupp, Combinatorial Group Theory, Springer, page 192,

     Throughout this section, we shall assume the existence of finitely presented groups with unsolvable word problem.

   • 1992, Svetlana Katok, Fuchsian Groups, University of Chicago Press, page 112,

     In this chapter we give some examples of Fuchsian groups. The most interesting and important ones are the so-called "arithmetic" Fuchsian groups, i.e., discrete subgroups of PSL(2,R) obtained by some "arithmetic" operations. One such construction we have already seen: if we choose all matrices of SL(2,R) with integer coefficients, then the corresponding elements of PSL(2,R) form the modular group PSL(2,Z).

   • 2007, Zhong-Qi Ma, Group Theory for Physicists, World Scientific, page 277,

     In Chap. 4 the fundamental concepts on Lie groups have been introduced through the SO(3) group and its covering group SU(2).

3. (geometry, archaic) An effective divisor on a curve.
4. A (usually small) group of people who perform music together.

5. (astronomy) A small number (up to about fifty) of galaxies that are near each other.
6. (chemistry) A column in the periodic table of chemical elements.
7. (chemistry) A functional group.

8. (sociology) A subset of a culture or of a society.
9. (military) An air force formation.
10. (geology) A collection of formations or rock strata.
11. (computing) A number of users with same rights with respect to accession, modification, and execution of files, computers and peripherals.
12. An element of an espresso machine from which hot water pours into the portafilter.
13. (music) A number of eighth, sixteenth, etc., notes joined at the stems; sometimes rather indefinitely applied to any ornament made up of a few short notes.
14. (sports) A set of teams playing each other in the same division, while not during the same period playing any teams that belong to other sets in the division.
15. (business) A commercial organization.

Synonyms

• (number of things or persons being in some relation to each other): collection, set
• (people who perform music together): band, ensemble
• See also Thesaurus:group

Hypernyms

• (in group theory): monoid

Hyponyms

Derived terms

• subgroup

Related terms

Descendants

• ? Gulf Arabic: ?????
• ? Japanese: ???? (gur?pu)
• ? Korean: ?? (geurup)
• ? Tongan: kulupu

Translations

References

• group on Wikipedia.Wikipedia

Verb

group (third-person singular simple present groups, present participle grouping, simple past and past participle grouped)

1. (transitive) To put together to form a group.

   group the dogs by hair colour

2. (intransitive) To come together to form a group.

Synonyms

• (put together to form a group): amass, categorise/categorize, classify, collect, collect up, gather, gather together, gather up; see also Thesaurus:round up
• (come together to form a group): assemble, begather, foregather, throng; see also Thesaurus:assemble

Translations

Further reading

• group in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• group in The Century Dictionary, New York, N.Y.: The Century Co., 1911.