NDLI: An APL approach to differential calculus yields a powerful tool

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An APL approach to differential calculus yields a powerful tool

Content Provider	ACM Digital Library
Author	Neidinger, R. D.
Abstract	An APL workspace is developed for the purpose of calculating numerical values of derivatives. The heart of the method, called automatic differentiation, is manipulation of numerical vectors --- an APL way of thinking. The method is not symbolic manipulation as taught in calculus, nor is it approximation as taught in numerical analysis. Automatic differentiation is implemented as a workspace (called GRADIENT) of 14 simple, one-line, numerical vector functions that perform all of the formal differentiation rules. The ideas are introduced for simple first derivatives of single variable functions. We then show that the GRADIENT workspace enables the calculation of all first-order partial derivatives of any typical function in any number of variables. This workspace is used as a tool in the solution of systems of nonlinear equations by Newton's method. Finally, we discuss how APL concepts led to a new approach to higher-order derivatives. This approach enables the calculation of higher-order derivatives for problems that overwhelm commercial symbolic differentiation programs; moreover, the resulting accuracy cannot be obtained by numerical approximation techniques.
Starting Page	285
Ending Page	288
Page Count	4
File Format	PDF
ISBN	0897913272
DOI	10.1145/75144.75182
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1989-07-01
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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