Accession Number : AD0692462

Title :   EPS: AN INTERACTIVE SYSTEM FOR SOLVING ELLIPTIC BOUNDARY-VALUE PROBLEMS WITH FACILITIES FOR DATA MANIPULATION AND GENERAL-PURPOSE COMPUTATION. USER'S GUIDE,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE ELECTRONIC SYSTEMS LAB

Personal Author(s) : Tillman,Coyt C. , Jr

Report Date : JUN 1969

Pagination or Media Count : 194

Abstract : A user's guide for EPS is presented. EPS solves two-dimensional boundary-value problems for elliptic systems of second-order partial differential equations. It also has general-purpose capabilities which permit the on-line definition and execution of arbitrary numerical procedures. The guide is primarily concerned with using EPS to solve boundary-value problems. Linear problems of this type that have no free surfaces or undefined parameters can be solved on a one-pass basis. Nonlinearities and other complications can be handled by iteration. A finite-difference method is employed which permits the use of irregular lattices, hence the crowding of nodes in sensitive regions. EPS operates on the IBM 7094 computer of the M.I.T. Compatible Time-Sharing System (CTSS), and exploits to an unusual degree the potential for interactive problem solving that CTSS affords. Input commands resemble statements in various algebraic compiler languages, and can be combined and abbreviated by means of macros. Improper input and other error conditions are handled so as to minimize user inconvenience. Common syntax errors, for example, are corrected automatically by the machine. Output is available in either numerical or graphical form. (Author)

Descriptors :   (*COMPUTER PROGRAMMING, *BOUNDARY VALUE PROBLEMS), (*PARTIAL DIFFERENTIAL EQUATIONS, NUMERICAL INTEGRATION), (*NUMERICAL INTEGRATION, *NUMERICAL ANALYSIS), DIFFERENCE EQUATIONS, GRAPHICS, MULTIPLE OPERATION, TIME SHARING, THESES

Subject Categories : Numerical Mathematics
      Computer Programming and Software
      Computer Hardware
      Computer Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE