Merck's Warenlexikon für Handel, Industrie und Gewerbe

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Monograph

Identifikator:: 895603128

URN:: urn:nbn:de:zbw-retromon-10120

Document type:: Monograph

Author:: Merck, Klemens http://d-nb.info/gnd/1064962637

Title:: Merck's Warenlexikon für Handel, Industrie und Gewerbe

Edition:: Sechste, völlig neu bearbeitete Auflage

Place of publication:: Leipzig

Publisher:: G.A. Gloeckner, Verlag für Handelswissenschaft

Year of publication:: 1919

Scope:: 1 Online-Ressource (IV, 555 Seiten)

Digitisation:: 2017

Collection:: Economics Books

Usage license:: Get license information via the feedback formular.

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Document type:: Monograph

Structure type:: Index

Collection:: Economics Books

20) PONTIFICIAE ACADEMIAE SCIENTIARVM SCRIPTA VARIA - -§ the two prices will, in general, again diverge unless A=o0 is changed back to A=1. Thus the purpose of the black box is to ensure that the model stays in touch with reality. As I have said, the example is a formal one, but there is no necessity in practice to restrict the device marked B to a single, instantaneous decision. d) Computability. With a large model, computability pre- sents a problem at every stage: in the preliminary processing of data, in estimating the parameters and in reaching solutions for the system of equations. I have already emphasised the importance of making a start and later modifying and extend- ing the initial model; if to this is added the need to reach solu- tions for a wide range of initial assumptions, it is clear that some special steps will have to be taken if the computing problems are to be kept under control. As explained in greater detail in [7] [44], a number of straightforward techniques are useful for this purpose. First, the extensive use of matrix algebra, in addition to its notational convenience, has the advantage that in the nu- merical manipulation of matrices a fundamentally simple set of operations is repeated a fixed number of times. This number depends on the order of the matrices and can be regarded as a parameter of the programme. Accordingly, if the number of categories in some classification has to be increased, it is only necessary to change a parameter and continue with the old programme. Second, great convenience lies in the computer’s facility for handling iterative or relaxation processes. By requiring a sequence of operations to be repeated until some numerical condition is satisfied, the same master programme can be retain- ed when linear relationships, which would themselves admit of direct analytical solution, are replaced by more complex rela- tionships which would not. To do this, a general method of solution must be adopted at the outset. ‘1] Stone - pag. 18

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