dlat2s (3) - Linux Manuals
subroutine dlat2s (characterUPLO, integerN, double precision, dimension( lda, * )A, integerLDA, real, dimension( ldsa, * )SA, integerLDSA, integerINFO)
DLAT2S converts a double-precision triangular matrix to a single-precision triangular matrix.
DLAT2S converts a DOUBLE PRECISION triangular matrix, SA, to a SINGLE PRECISION triangular matrix, A. RMAX is the overflow for the SINGLE PRECISION arithmetic DLAS2S checks that all the entries of A are between -RMAX and RMAX. If not the convertion is aborted and a flag is raised. This is an auxiliary routine so there is no argument checking.
UPLO is CHARACTER*1 = 'U': A is upper triangular; = 'L': A is lower triangular.
N is INTEGER The number of rows and columns of the matrix A. N >= 0.
A is DOUBLE PRECISION array, dimension (LDA,N) On entry, the N-by-N triangular coefficient matrix A.
LDA is INTEGER The leading dimension of the array A. LDA >= max(1,N).
SA is REAL array, dimension (LDSA,N) Only the UPLO part of SA is referenced. On exit, if INFO=0, the N-by-N coefficient matrix SA; if INFO>0, the content of the UPLO part of SA is unspecified.
LDSA is INTEGER The leading dimension of the array SA. LDSA >= max(1,M).
INFO is INTEGER = 0: successful exit. = 1: an entry of the matrix A is greater than the SINGLE PRECISION overflow threshold, in this case, the content of the UPLO part of SA in exit is unspecified.
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
- September 2012
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