TESTING/LIN/ctpt06.f(3) Library Functions Manual TESTING/LIN/ctpt06.f(3) NAME TESTING/LIN/ctpt06.f SYNOPSIS Functions/Subroutines subroutine ctpt06 (rcond, rcondc, uplo, diag, n, ap, rwork, rat) CTPT06 Function/Subroutine Documentation subroutine ctpt06 (real rcond, real rcondc, character uplo, character diag, integer n, complex, dimension( * ) ap, real, dimension( * ) rwork, real rat) CTPT06 Purpose: CTPT06 computes a test ratio comparing RCOND (the reciprocal condition number of the triangular matrix A) and RCONDC, the estimate computed by CTPCON. Information about the triangular matrix is used if one estimate is zero and the other is non-zero to decide if underflow in the estimate is justified. Parameters RCOND RCOND is REAL The estimate of the reciprocal condition number obtained by forming the explicit inverse of the matrix A and computing RCOND = 1/( norm(A) * norm(inv(A)) ). RCONDC RCONDC is REAL The estimate of the reciprocal condition number computed by CTPCON. UPLO UPLO is CHARACTER Specifies whether the matrix A is upper or lower triangular. = 'U': Upper triangular = 'L': Lower triangular DIAG DIAG is CHARACTER Specifies whether or not the matrix A is unit triangular. = 'N': Non-unit triangular = 'U': Unit triangular N N is INTEGER The order of the matrix A. N >= 0. AP AP is COMPLEX array, dimension (N*(N+1)/2) The upper or lower triangular matrix A, packed columnwise in a linear array. The j-th column of A is stored in the array AP as follows: if UPLO = 'U', AP((j-1)*j/2 + i) = A(i,j) for 1<=i<=j; if UPLO = 'L', AP((j-1)*(n-j) + j*(j+1)/2 + i-j) = A(i,j) for j<=i<=n. RWORK RWORK is REAL array, dimension (N) RAT RAT is REAL The test ratio. If both RCOND and RCONDC are nonzero, RAT = MAX( RCOND, RCONDC )/MIN( RCOND, RCONDC ) - 1. If RAT = 0, the two estimates are exactly the same. Author Univ. of Tennessee Univ. of California Berkeley Univ. of Colorado Denver NAG Ltd. Definition at line 111 of file ctpt06.f. Author Generated automatically by Doxygen for LAPACK from the source code. LAPACK Version 3.12.0 TESTING/LIN/ctpt06.f(3)