1. NAME AND TITLE
SECA: Evaluator of Angular Bounds for a Two-Dimensional Symmetric Gaussian
Gibbs and Hill, Inc., New York, New York.
3. CODING LANGUAGE AND COMPUTER
Fortran IV; IBM 360/370.
4. NATURE OF PROBLEM SOLVED
SECA calculates the azimuthal boundaries of the areas associated with the discrete directions of
the Gaussian quadrature sets used in discrete ordinate calculations for R-Z and X-Y geometries.
5. METHOD OF SOLUTION
The method of computation is based on the numerical integration of the analytical expression for
a differential azimuthal strip on a given polar band.
6. RESTRICTIONS OR LIMITATIONS
None noted. SECA is a small analysis routine intended to be run on a Load-and-Go basis.
7. TYPICAL RUNNING TIME
Compilation, linkage, and execution of a problem which calculated the azimuthal bounds for S4,
S6, S8, S12, and S16 quadrature sets ran in about two minutes using an IBM 360 compiler with
Optimization = 2.
8. COMPUTER HARDWARE REQUIREMENTS
SECA is operable on the IBM 360/370 computers using standard equipment. Approximately 46 K
of core storage is required. No tape drives are needed.
9. COMPUTER SOFTWARE REQUIREMENTS
A Fortran IV compiler is required.
Roy A. Castelli and Ed Ochoa, "An Analytical Technique for Evaluating the Angular Bounds for
a Two-Dimensional Symmetric Gaussian Quadrature Set," Informal paper (October 1976).
11. CONTENTS OF CODE PACKAGE
Included are the referenced document and one (1.2MB) DOS diskette which contains the source
code and sample problem input and output.
12. DATE OF ABSTRACT
KEYWORDS: COUPLING, DISCRETE ORDINATES-MONTE CARLO; GEOMETRY DATA PROCESSING