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

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 FBR is directed to inform the petitioners forthwith if requested by them, the specific parameters on the basis of which, their cases were selected for audit under section 214C of the Ordinance,' the judgement concluded.
The court further observed that 'In present case, it is not legally justified that what evil will be remedied by keeping the parameters confidential, especially when it is repeatedly directed by Courts that parameters be transparent and publically disclosed.'
The court held that the impugned provision is construed and read down to the effect that under subsection (1A) of Section 214C of the Ordinance, the board shall keep the parameters confidential.
The disturbed values of subsidences are fitted with the model and the values of its parameters are determined.
Where I' is solubility parameter, I is the density, R is gas constant (1.987cal mol-1 K-1), T is the temperature (K), M is the molecular weight, IH is the molar heat of vaporisation, G is group molar attraction constant derived from experiments, 18.02 MPa1/2 converts into cal1/2 cm-3/2.
When CPPs are not identified in the original submission, FDA has asked numerous questions regarding the manufacturing process, impact of variabilities in the CMAs and process parameters, control strategy based on these variabilities, basis of verification of the ranges proposed for the process parameters and the link between the variability of any of the process parameters and CQAs.
Unlike profile parameters, roughness parameters are subject to distortion by the filter used for their calculation.
(2) The parameters y, E and A are estimated using a maximum likelihood approach.
* to explore the critical age of decline for other gait parameters for healthy women.
The asymptotic correlations between the parameters are shown in Table III.
The parameters for ACA are extremely important to the performance of the algorithm, and appropriate parameters can enhance the global search ability of the algorithm and improve the convergence speed considerably [24].