# parameter

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## parameter

1. one of a number of auxiliary variables in terms of which all the variables in an implicit functional relationship can be explicitly expressed
2. a variable whose behaviour is not being considered and which may for present purposes be regarded as a constant, as y in the partial derivative ∂f(x,y)/∂x

## Parameter

a variable whose values are used to distinguish elements of a given set. For example, the equation (x — a)2 + (y — b)2 = 1 in rectangular Cartesian coordinates determines the set of all circles of radius 1 in the xOy plane. By setting a = 3 and b = 4, we isolate in this set the completely defined circle with center at (3, 4). Thus, a and b are the parameters of a circle in the set.

## Parameter

in engineering, a quantity that characterizes a certain aspect of a process, phenomenon, system, or device. Examples of such quantities in mechanical systems are mass, coefficient of friction, moment of inertia, and tension. Such parameters as heat capacity, heat flow, and thermal head are used for thermal processes. Typical electrical parameters are resistance, inductance, and capacitance. The physical processes that occur in a system are describable by equations giving the relation between the variable quantities of the processes. Parameters are usually the coefficients of the equations. They can be constants, or they can be variables dependent on time or the system’s coordinates.

The parameters of a system or device can be lumped or they can be distributed in space relative to one, two, or three coordinates. A typical example of a system with distributed parameters is an electric power transmission line, in which the inductance, capacitance, and resistance (conductance) are distributed along the entire length of the line. An example of a lumped parameter is the load on a small segment of a much longer beam.

M. M. MAIZEL

## parameter

[pə′ram·əd·ər]
(crystallography)
Any of the axial lengths or interaxial angles that define a unit cell.
(electricity)
The resistance, capacitance, inductance, or impedance of a circuit element.
The value of a transistor or tube characteristic.
(mathematics)
An arbitrary constant or variable so appearing in a mathematical expression that changing it gives various cases of the phenomenon represented.
(physics)
A quantity which is constant under a given set of conditions, but may be different under other conditions.

## parameter

(1) Any value passed to a program by the user or by another program in order to configure the program for a particular purpose. A parameter may be anything; for example, a file name, a coordinate, a range of values, a money amount or a code of some kind. Parameters may be required as in parameter-driven software (see below) or they may be optional. Parameters are often entered as a series of values following the program name when the program is loaded; for example, a DOS switch defines a parameter. In the command dir /p the /p is a parameter switch that means pause after every screenful.

(2) In programming, a value passed to a subroutine or function for processing. Programming today's graphical applications in languages such as C, C++ and Java requires knowledge of hundreds of parameters.

In the following C function, which creates the text window for the Windows version of this database, there are 11 parameters passed to the CreateWindow routine. Some of them call yet other functions for necessary information. In order to call this routine in a program, the programmer must determine the values for every parameter.

``` hWndText = CreateWindow
(
"TextWClass",
NULL,
WS_CHILD|WS_BORDER|WS_VSCROLL|WS_TABSTOP,
xChar*23+GetSystemMetrics(SM_CXVSCROLL)+8,
yChar*4,
Rect.right-Rect.left+1-xChar*23
-2*GetSystemMetrics(SM_CXVSCROLL)+5,
yChar*(Lines+1)+2,
hWnd,
IDC_TEXTLIST,
(HANDLE)hInstance,
NULL
);
```
References in periodicals archive ?
Williams, "Frequency domain response of a parametrically excited riser under random wave forces," Journal of Sound and Vibration, vol.
The parametrically standardized distribution can be estimated by (EQUATION).
I can therefore choose to treat steady-state depreciation parametrically. Consequently, I impose the same prior on [delta] and on the other parameters in the model.
[5] Wang X.: Parametrically excited nonlinear waves and their localizations.
The robust stability of the closed control loop with considered parametrically uncertain second order time-delay model (1) and recommended fractional order PI controller (3) will be analyzed by means of the graphical method described in the following Section.
Furthermore, the loaded capacitor is further parametrically investigated.
Yang and Sethna [5] used the averaging method to study the local and global bifurcations for parametrically excited vibrations of nearly square plates.
In this section, we apply the proposed method in Section 3 to a parametrically excited viscoelastic moving belt with the external damping.
In order to decide between the alternative hypotheses of gain enhancement and receptive-field modulation, studies have been conducted where the shape of the neuronal receptive fields has been estimated using parametrically varying stimulation.
This paper employs a within study comparison (WSC) methodology to examine the performance of two approaches: (1) a more flexible modeling approach, which employs year fixed-effects rather than trying to parametrically model the pretest trend; and (2) match treatment and comparison cases to reduce reliance on modeling the pretreatment trend.
The service could establish, recombine, destruct, and even inherit efficiently to requested parameters which cannot be satisfied well by traditional access control models, such as the role based access control model [5], where an authorization to the subject could not change parametrically and dynamically with its environment.

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