parameter 音标拼音: [pɚ'æmətɚ]
n . 助变数,媒介变数,参数
助变数,媒介变数,参数
parameter 对参数线性的
parameter 参数;参项;参量;参(变)量;参(变)数
PAR ;
PARAM
parameter z 参数( 电晶体用 )
parameter 参数
parameter n 1 :
a constant in the equation of a curve that can be varied to yield a family of similar curves [
synonym : {
parameter },
{
parametric quantity }]
2 :
any factor that defines a system and determines (
or limits )
its performance 3 : (
computer science )
a reference or value that is passed to a function ,
procedure ,
subroutine ,
command ,
or program [
synonym :
{
argument }, {
parameter }]
4 :
a quantity (
such as the mean or variance )
that characterizes a statistical population and that can be estimated by calculations from sample data Parameter \
Pa *
ram "
e *
ter \,
n . [
Pref .
para - -
meter :
cf .
F .
param [`
e ]
tre .]
1 .
A constant number which is part of a theory ,
function ,
or calculation ,
whose value is not determined by the form of the theory or equation itself ,
and may in some cases be arbitrary assigned .
[
PJC ]
2 .
Specifically :
(
a ) (
Math .)
A term applied to some characteristic magnitude whose value ,
invariable as long as one and the same function ,
curve ,
surface ,
etc .,
is considered ,
serves to distinguish that function ,
curve ,
surface ,
etc .,
from others of the same kind or family . --
Brande &
C .
(
b ) (
Conic Sections ) (
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 .
[
1913 Webster ]
Note :
The parameter of the principal axis of a conic section is called the latus rectum .
[
1913 Webster ]
3 . (
Science )
Any constant number which is required to calculate values of observed phenomena according to a theory ,
but the value of which must be determined by experiment ,
and cannot be calculated from the fundamental assumptions of the theory .
In general ,
a theory which has a large number of parameters ,
though it may accurately predict experimental results ,
is considered as having less explanatory power and as being less esthetically pleasing than a theory with fewer parameters .
[
PJC ]
4 . (
Crystallog .)
The ratio of the three crystallographic axes which determines the position of any plane ;
also ,
the fundamental axial ratio for a given species .
[
1913 Webster ]
5 .
The limits ,
guidelines ,
or assumptions from within which an activity is carried out ;
as ,
new arrivals need to learn the parameters of the research in our department .
[
PJC ]
6 . (
Computers )
A variable used in a calculation within a computer program which must be assigned a value before the calculation can be performed ;
as ,
let '
s plug in the parameters and see what the result is .
[
PJC ]
7 .
A characteristic or element ,
especially one used as a criterion for evaluation or judgment ;
as ,
a useful parameter for determining efficiency .
[
PJC ]
74 Moby Thesaurus words for "
parameter ":
barometer ,
boundaries ,
boundary condition ,
bounds ,
bourns ,
canon ,
catch ,
check ,
circumference ,
circumscription ,
clause ,
compass ,
condition ,
confines ,
coordinates ,
criterion ,
degree ,
donnee ,
edges ,
escalator clause ,
escape clause ,
escape hatch ,
fine print ,
fringes ,
gauge ,
given ,
graduated scale ,
grounds ,
joker ,
kicker ,
limitations ,
limiting condition ,
limits ,
marches ,
measure ,
metes ,
metes and bounds ,
model ,
norm ,
obligation ,
outlines ,
outskirts ,
pale ,
parameters ,
pattern ,
perimeter ,
periphery ,
prerequisite ,
provision ,
provisions ,
proviso ,
quantity ,
reading ,
readout ,
requisite ,
rule ,
saving clause ,
scale ,
sine qua non ,
skirts ,
small print ,
specification ,
standard ,
stipulation ,
string ,
terms ,
test ,
touchstone ,
type ,
ultimatum ,
value ,
verges ,
whereas ,
yardstick
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