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Program obtainable from: CPC Program Library, Queen’s element matrices for any such operator may be constructed University of Belfast, N. Ireland (see application form in this from three matrix primitives. The results are of use in threeissue) dimensional potential and flow problems, electromagnetics of plasnias, diffusion problems and elsewhere. Computer: Any PDP-1 1 for demonstration; any machine with ANSI Fortran compiler for subroutine package Method of solution The primitives are constructed for any specified order N of Operating system: Demonstration programs run under RT-1 1 polynomial approximation, by computing the standard tetrasystem. Subroutine package is system-independent hedron interpolation polynomials, then differentiating and integrating them as required. Differentiations are performed Programming language: Fortran IV analytically, while integrations use Newton—Cotes quadrature of sufficiently high order to g~.saranteezero discretization High speed storage required: approx. 25 Kwords error. The precision level attainable on the machine used is checked by the program at run-time. No. of bits in a word: 16 for demonstration programs. Subroutine package resets itself at run-time to the necessary preRestrictions on thecomplexity of theproblem cision level Matrices for interpolation ordersbeyond 7 or 8 may suffer from round-off error accumulation. Overlay structure: none Typical running time No. of magnetic tapesrequired: none On PDP-1 1/03 with KEy-h, about two hours for matrices of order 4. On IBM 370/165, about 8 mm. Otherperipherals used: none for subroutine package. Standard interactive terminal (VDU) for demonstration programs. Unusual featuresof theprogram The available machine precision is determined by the program No. of cards in combined program and test deck: 930 itself at run-time. |
