# Parameter vs Vary - What's the difference?

parameter | vary |

## As nouns the difference between parameter and vary

is that parameter is (mathematics|physics) a variable kept constant during an experiment, calculation or similar while vary is (obsolete) alteration; change.

## As a verb vary is

to change with time or a similar parameter.

# parameter

## English

* parametre

### Noun

(en noun)
• (mathematics, physics) A variable kept constant during an experiment, calculation or similar.
• (programming) An input variable of a procedure definition, that gets an actual value (argument) at execution time (formal parameter) .
• Roughly, a tuple of arguments could be thought of as a vector, whereas a tuple of parameters''' could be thought of as a covector (i.e., linear functional). When a function is called, a '''parameter tuple becomes "bound" to an argument tuple, allowing the function instance itself to be computed to yield a return value. This would be roughly analogous to applying a covector to a vector (by taking their dot product (or, rather, matrix-product of row vector and column vector)) to obtain a scalar.
• (programming) An actual value given to such a formal parameter (argument or actual parameter) .
• A characteristic or feature that distinguishes something from others.
• (geometry) In the ellipse and hyperbola, a third proportional to any diameter and its conjugate, or in the parabola, to any abscissa and the corresponding ordinate.
• The parameter of the principal axis of a conic section is called the latus rectum.
• (crystallography) The ratio of the three crystallographic axes which determines the position of any plane.
• (crystallography) The fundamental axial ratio for a given species.
• #### Usage notes

* (the value used to instantiate the name) Some authors regard use of parameter'' to mean ''argument'' as imprecise, preferring that ''parameter'' refers only to the name that will be instantiated, and ''argument to refer to the value that will be supplied to it at runtime.

#### Synonyms

* (value passed to a function) argument * (characteristic distinguishing something from others) distinguishing feature * See also

#### Derived terms

* actual parameter * formal parameter

* variable

# vary

## English

### Verb

(en-verb)
• To change with time or a similar parameter.
• He varies his magic tricks so as to minimize the possibility that any given audience member will see the same trick twice.
• To institute a change in, from a current state; to modify.
• You should vary your diet. Eating just bread will do you harm in the end.
• * Waller
• Gods, that never change their state, / Vary oft their love and hate.
• * Dryden
• We are to vary the customs according to the time and country where the scene of action lies.
• Not to remain constant: to change with time or a similar parameter.
• His mood varies by the hour.
The sine function varies between &
• x2212;1 and 1.
• * Addison
• While fear and anger, with alternate grace, / Pant in her breast, and vary in her face.
• (of the members of a group) To display differences.
• ''The sprouting tendency of potatoes varies between cultivars, years and places of growing.
• To be or act different from the usual.
• I'm not comfortable with `3.Nc3` in the Caro-Kann, so I decided to vary and play `exd5`.
• To make of different kinds; to make different from one another; to diversity; to variegate.
• * Sir Thomas Browne
• God hath varied their inclinations.
• * Milton
• God hath here / Varied his bounty so with new delights.
• (music) To embellish; to change fancifully; to present under new aspects, as of form, key, measure, etc. See variation .
• (obsolete) To disagree; to be at variance or in dissension.
• * Webster (1623)
• the rich jewel which we vary for

### Noun

(-)
• (obsolete) Alteration; change.
• (Shakespeare)

* ----