Annotation of rpl/lapack/lapack/dlapmr.f, revision 1.1
1.1 ! bertrand 1: SUBROUTINE DLAPMR( FORWRD, M, N, X, LDX, K )
! 2: IMPLICIT NONE
! 3: *
! 4: * Originally DLAPMT
! 5: * -- LAPACK auxiliary routine (version 3.2) --
! 6: * -- LAPACK is a software package provided by Univ. of Tennessee, --
! 7: * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
! 8: * November 2006
! 9: *
! 10: * Adapted to DLAPMR
! 11: * July 2010
! 12: *
! 13: * .. Scalar Arguments ..
! 14: LOGICAL FORWRD
! 15: INTEGER LDX, M, N
! 16: * ..
! 17: * .. Array Arguments ..
! 18: INTEGER K( * )
! 19: DOUBLE PRECISION X( LDX, * )
! 20: * ..
! 21: *
! 22: * Purpose
! 23: * =======
! 24: *
! 25: * DLAPMR rearranges the rows of the M by N matrix X as specified
! 26: * by the permutation K(1),K(2),...,K(M) of the integers 1,...,M.
! 27: * If FORWRD = .TRUE., forward permutation:
! 28: *
! 29: * X(K(I),*) is moved X(I,*) for I = 1,2,...,M.
! 30: *
! 31: * If FORWRD = .FALSE., backward permutation:
! 32: *
! 33: * X(I,*) is moved to X(K(I),*) for I = 1,2,...,M.
! 34: *
! 35: * Arguments
! 36: * =========
! 37: *
! 38: * FORWRD (input) LOGICAL
! 39: * = .TRUE., forward permutation
! 40: * = .FALSE., backward permutation
! 41: *
! 42: * M (input) INTEGER
! 43: * The number of rows of the matrix X. M >= 0.
! 44: *
! 45: * N (input) INTEGER
! 46: * The number of columns of the matrix X. N >= 0.
! 47: *
! 48: * X (input/output) DOUBLE PRECISION array, dimension (LDX,N)
! 49: * On entry, the M by N matrix X.
! 50: * On exit, X contains the permuted matrix X.
! 51: *
! 52: * LDX (input) INTEGER
! 53: * The leading dimension of the array X, LDX >= MAX(1,M).
! 54: *
! 55: * K (input/output) INTEGER array, dimension (M)
! 56: * On entry, K contains the permutation vector. K is used as
! 57: * internal workspace, but reset to its original value on
! 58: * output.
! 59: *
! 60: * =====================================================================
! 61: *
! 62: * .. Local Scalars ..
! 63: INTEGER I, IN, J, JJ
! 64: DOUBLE PRECISION TEMP
! 65: * ..
! 66: * .. Executable Statements ..
! 67: *
! 68: IF( M.LE.1 )
! 69: $ RETURN
! 70: *
! 71: DO 10 I = 1, M
! 72: K( I ) = -K( I )
! 73: 10 CONTINUE
! 74: *
! 75: IF( FORWRD ) THEN
! 76: *
! 77: * Forward permutation
! 78: *
! 79: DO 50 I = 1, M
! 80: *
! 81: IF( K( I ).GT.0 )
! 82: $ GO TO 40
! 83: *
! 84: J = I
! 85: K( J ) = -K( J )
! 86: IN = K( J )
! 87: *
! 88: 20 CONTINUE
! 89: IF( K( IN ).GT.0 )
! 90: $ GO TO 40
! 91: *
! 92: DO 30 JJ = 1, N
! 93: TEMP = X( J, JJ )
! 94: X( J, JJ ) = X( IN, JJ )
! 95: X( IN, JJ ) = TEMP
! 96: 30 CONTINUE
! 97: *
! 98: K( IN ) = -K( IN )
! 99: J = IN
! 100: IN = K( IN )
! 101: GO TO 20
! 102: *
! 103: 40 CONTINUE
! 104: *
! 105: 50 CONTINUE
! 106: *
! 107: ELSE
! 108: *
! 109: * Backward permutation
! 110: *
! 111: DO 90 I = 1, M
! 112: *
! 113: IF( K( I ).GT.0 )
! 114: $ GO TO 80
! 115: *
! 116: K( I ) = -K( I )
! 117: J = K( I )
! 118: 60 CONTINUE
! 119: IF( J.EQ.I )
! 120: $ GO TO 80
! 121: *
! 122: DO 70 JJ = 1, N
! 123: TEMP = X( I, JJ )
! 124: X( I, JJ ) = X( J, JJ )
! 125: X( J, JJ ) = TEMP
! 126: 70 CONTINUE
! 127: *
! 128: K( J ) = -K( J )
! 129: J = K( J )
! 130: GO TO 60
! 131: *
! 132: 80 CONTINUE
! 133: *
! 134: 90 CONTINUE
! 135: *
! 136: END IF
! 137: *
! 138: RETURN
! 139: *
! 140: * End of ZLAPMT
! 141: *
! 142: END
! 143:
CVSweb interface <joel.bertrand@systella.fr>