Annotation of rpl/lapack/lapack/zlapmt.f, revision 1.1
1.1 ! bertrand 1: SUBROUTINE ZLAPMT( FORWRD, M, N, X, LDX, K )
! 2: *
! 3: * -- LAPACK auxiliary routine (version 3.2) --
! 4: * -- LAPACK is a software package provided by Univ. of Tennessee, --
! 5: * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
! 6: * November 2006
! 7: *
! 8: * .. Scalar Arguments ..
! 9: LOGICAL FORWRD
! 10: INTEGER LDX, M, N
! 11: * ..
! 12: * .. Array Arguments ..
! 13: INTEGER K( * )
! 14: COMPLEX*16 X( LDX, * )
! 15: * ..
! 16: *
! 17: * Purpose
! 18: * =======
! 19: *
! 20: * ZLAPMT rearranges the columns of the M by N matrix X as specified
! 21: * by the permutation K(1),K(2),...,K(N) of the integers 1,...,N.
! 22: * If FORWRD = .TRUE., forward permutation:
! 23: *
! 24: * X(*,K(J)) is moved X(*,J) for J = 1,2,...,N.
! 25: *
! 26: * If FORWRD = .FALSE., backward permutation:
! 27: *
! 28: * X(*,J) is moved to X(*,K(J)) for J = 1,2,...,N.
! 29: *
! 30: * Arguments
! 31: * =========
! 32: *
! 33: * FORWRD (input) LOGICAL
! 34: * = .TRUE., forward permutation
! 35: * = .FALSE., backward permutation
! 36: *
! 37: * M (input) INTEGER
! 38: * The number of rows of the matrix X. M >= 0.
! 39: *
! 40: * N (input) INTEGER
! 41: * The number of columns of the matrix X. N >= 0.
! 42: *
! 43: * X (input/output) COMPLEX*16 array, dimension (LDX,N)
! 44: * On entry, the M by N matrix X.
! 45: * On exit, X contains the permuted matrix X.
! 46: *
! 47: * LDX (input) INTEGER
! 48: * The leading dimension of the array X, LDX >= MAX(1,M).
! 49: *
! 50: * K (input/output) INTEGER array, dimension (N)
! 51: * On entry, K contains the permutation vector. K is used as
! 52: * internal workspace, but reset to its original value on
! 53: * output.
! 54: *
! 55: * =====================================================================
! 56: *
! 57: * .. Local Scalars ..
! 58: INTEGER I, II, IN, J
! 59: COMPLEX*16 TEMP
! 60: * ..
! 61: * .. Executable Statements ..
! 62: *
! 63: IF( N.LE.1 )
! 64: $ RETURN
! 65: *
! 66: DO 10 I = 1, N
! 67: K( I ) = -K( I )
! 68: 10 CONTINUE
! 69: *
! 70: IF( FORWRD ) THEN
! 71: *
! 72: * Forward permutation
! 73: *
! 74: DO 50 I = 1, N
! 75: *
! 76: IF( K( I ).GT.0 )
! 77: $ GO TO 40
! 78: *
! 79: J = I
! 80: K( J ) = -K( J )
! 81: IN = K( J )
! 82: *
! 83: 20 CONTINUE
! 84: IF( K( IN ).GT.0 )
! 85: $ GO TO 40
! 86: *
! 87: DO 30 II = 1, M
! 88: TEMP = X( II, J )
! 89: X( II, J ) = X( II, IN )
! 90: X( II, IN ) = TEMP
! 91: 30 CONTINUE
! 92: *
! 93: K( IN ) = -K( IN )
! 94: J = IN
! 95: IN = K( IN )
! 96: GO TO 20
! 97: *
! 98: 40 CONTINUE
! 99: *
! 100: 50 CONTINUE
! 101: *
! 102: ELSE
! 103: *
! 104: * Backward permutation
! 105: *
! 106: DO 90 I = 1, N
! 107: *
! 108: IF( K( I ).GT.0 )
! 109: $ GO TO 80
! 110: *
! 111: K( I ) = -K( I )
! 112: J = K( I )
! 113: 60 CONTINUE
! 114: IF( J.EQ.I )
! 115: $ GO TO 80
! 116: *
! 117: DO 70 II = 1, M
! 118: TEMP = X( II, I )
! 119: X( II, I ) = X( II, J )
! 120: X( II, J ) = TEMP
! 121: 70 CONTINUE
! 122: *
! 123: K( J ) = -K( J )
! 124: J = K( J )
! 125: GO TO 60
! 126: *
! 127: 80 CONTINUE
! 128: *
! 129: 90 CONTINUE
! 130: *
! 131: END IF
! 132: *
! 133: RETURN
! 134: *
! 135: * End of ZLAPMT
! 136: *
! 137: END
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