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Diffstat (limited to '2.3-1/src/fortran/lapack/zlaswp.f')
-rw-r--r-- | 2.3-1/src/fortran/lapack/zlaswp.f | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/2.3-1/src/fortran/lapack/zlaswp.f b/2.3-1/src/fortran/lapack/zlaswp.f new file mode 100644 index 00000000..8b07e48b --- /dev/null +++ b/2.3-1/src/fortran/lapack/zlaswp.f @@ -0,0 +1,119 @@ + SUBROUTINE ZLASWP( N, A, LDA, K1, K2, IPIV, INCX ) +* +* -- LAPACK auxiliary routine (version 3.1) -- +* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. +* November 2006 +* +* .. Scalar Arguments .. + INTEGER INCX, K1, K2, LDA, N +* .. +* .. Array Arguments .. + INTEGER IPIV( * ) + COMPLEX*16 A( LDA, * ) +* .. +* +* Purpose +* ======= +* +* ZLASWP performs a series of row interchanges on the matrix A. +* One row interchange is initiated for each of rows K1 through K2 of A. +* +* Arguments +* ========= +* +* N (input) INTEGER +* The number of columns of the matrix A. +* +* A (input/output) COMPLEX*16 array, dimension (LDA,N) +* On entry, the matrix of column dimension N to which the row +* interchanges will be applied. +* On exit, the permuted matrix. +* +* LDA (input) INTEGER +* The leading dimension of the array A. +* +* K1 (input) INTEGER +* The first element of IPIV for which a row interchange will +* be done. +* +* K2 (input) INTEGER +* The last element of IPIV for which a row interchange will +* be done. +* +* IPIV (input) INTEGER array, dimension (K2*abs(INCX)) +* The vector of pivot indices. Only the elements in positions +* K1 through K2 of IPIV are accessed. +* IPIV(K) = L implies rows K and L are to be interchanged. +* +* INCX (input) INTEGER +* The increment between successive values of IPIV. If IPIV +* is negative, the pivots are applied in reverse order. +* +* Further Details +* =============== +* +* Modified by +* R. C. Whaley, Computer Science Dept., Univ. of Tenn., Knoxville, USA +* +* ===================================================================== +* +* .. Local Scalars .. + INTEGER I, I1, I2, INC, IP, IX, IX0, J, K, N32 + COMPLEX*16 TEMP +* .. +* .. Executable Statements .. +* +* Interchange row I with row IPIV(I) for each of rows K1 through K2. +* + IF( INCX.GT.0 ) THEN + IX0 = K1 + I1 = K1 + I2 = K2 + INC = 1 + ELSE IF( INCX.LT.0 ) THEN + IX0 = 1 + ( 1-K2 )*INCX + I1 = K2 + I2 = K1 + INC = -1 + ELSE + RETURN + END IF +* + N32 = ( N / 32 )*32 + IF( N32.NE.0 ) THEN + DO 30 J = 1, N32, 32 + IX = IX0 + DO 20 I = I1, I2, INC + IP = IPIV( IX ) + IF( IP.NE.I ) THEN + DO 10 K = J, J + 31 + TEMP = A( I, K ) + A( I, K ) = A( IP, K ) + A( IP, K ) = TEMP + 10 CONTINUE + END IF + IX = IX + INCX + 20 CONTINUE + 30 CONTINUE + END IF + IF( N32.NE.N ) THEN + N32 = N32 + 1 + IX = IX0 + DO 50 I = I1, I2, INC + IP = IPIV( IX ) + IF( IP.NE.I ) THEN + DO 40 K = N32, N + TEMP = A( I, K ) + A( I, K ) = A( IP, K ) + A( IP, K ) = TEMP + 40 CONTINUE + END IF + IX = IX + INCX + 50 CONTINUE + END IF +* + RETURN +* +* End of ZLASWP +* + END |