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  • 1
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    Some properties of n-dimensional triangulations (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A number of mathematical results relevant to the problem of constructing a triangulation, i.e., a simplicial tessellation, of the convex hull of an arbitrary finite set of points in n-space are described. The principal results achieved are: (1) a set of n+2 points in n-space may be triangulated in at most 2 different ways; (2) the sphere test defined in this report selects a preferred one of these two triangulations; (3) a set of parameters is defined that permits the characterization and enumeration of all sets of n+2 points in n-space that are significantly different from the point of view of their possible triangulation; (4) the local sphere test induces a global sphere test property for a triangulation; and (5) a triangulation satisfying the global sphere property is dual to the n-dimensional Dirichlet tesselation, i.e., it is a Delaunay triangulation.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-176535 , JPL-PUB-85-42 , NAS 1.26:176535
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Basic linear algebra subprograms for FORTRAN usage (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A package of 38 low level subprograms for many of the basic operations of numerical linear algebra is presented. The package is intended to be used with FORTRAN. The operations in the package are dot products, elementary vector operations, Givens transformations, vector copy and swap, vector norms, vector scaling, and the indices of components of largest magnitude. The subprograms and a test driver are available in portable FORTRAN. Versions of the subprograms are also provided in assembly language for the IBM 360/67, the CDC 6600 and CDC 7600, and the Univac 1108.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-156932 , SAND-77-0898
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    The IFIP WG 2.5 proposals on FORTRAN (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Language problem areas are summarized and possible solutions are discussed. Areas covered are: (1) double complex, (2) arrays of work space in library subroutines, (3) calls from a library subprogram to user code, (4) decomposition and synthesis of floating-point numbers, (5) environment parameters, (6) precision function, and (7) control structures.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Conf. on the Programming Environ. for Develop. of Numerical Software; p 7-10
    Format: text
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    NASA TECHNICAL REPORTS
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