Accession Number : AD0690865

Title :   A FORTRAN SUBROUTINE REQUIRING ONLY n(n+1)/2 MATRIX LOCATIONS TO INVERT, SOLVE, AND FIND THE DETERMINANT OF A REAL SYMMETRIC MATRIX.

Descriptive Note : Memorandum rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Mason,Janet P.

Report Date : MAR 1969

Pagination or Media Count : 14

Abstract : A Fortran subroutine, F1-ANL-SYMINV, written at Argonne National Laboratory, that solves, inverts, and finds the determinant of symmetric real matrices has been modified. The original subroutine uses only the upper triangular portion of the matrix; however, it requires that the entire matrix be input to the subroutine. The modified version, F1-NRL-SYMINV, requires that only the upper triangular portion of the matrix be input to the subroutine, thereby reducing the matrix storage requirements from n squared locations to n(n+1)/2 locations. (Author)

Descriptors :   (*MATRICES(MATHEMATICS), SUBROUTINES), DETERMINANTS(MATHEMATICS), COMPUTER PROGRAMS

Subject Categories : Theoretical Mathematics
      Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE