# 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 ?
The following result is concerned with the positive realness of a discrete nominal transfer matrix of the extended discrete nominal [DH.sub.g] which guarantees that of the transfer matrix of a parametrical disturbed [DH.sub.g] under a set of structured parametrical perturbations of the dynamics, output, control, and interconnection matrices.
According to the above analysis, a general roadmap in optimal design of linear-arrayed GMA could be summarized as the following steps: to begin with, the number of GMM patches in given condition should be determined following the design procedure detailed in Figure 12; then, take the basic design as an initial condition, select an appropriate objective function, such as (11), together with the boundary conditions (12) to (14), and the optimized solution could be obtained by parametrical iteration.
The parametrical identification of dynamic series is tested under the assumption, that the dot decomposition of time series is represented by Mackey-Glass equation.
One should underline that the applicable models decrease the uncertainty of the parametrical uncertainty, whereupon it is possible to determine certain probability to each projection.
The decisions of tasks getting for structural and parametrical identification in view of features of Mamdani's and Sugeno's model are used by us during development of algorithm for control and correction of signal characteristics from text elements images.
Figure 1 illustrates the notation used in the following equations for parametrical knot description.
The simplified parametrical geometric model of a hydraulic loading unit was developed by geometrical modeling software SolidWorks.
2.2 The asymmetric profile involutes and filet curve parametrical equations
The parameters of the model fitted in each pixel are seen as parametrical cartographies or maps.
DMA method is employed to conduct the time scanning and temperature scanning test, which systematically investigates the viscoelasticity and time-temperature coupling effect of PVB material in a parametrical way.

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