slapmt(3S)

NAME
     SLAPMT - rearrange the columns of the M by N matrix X as specified by the
     permutation K(1),K(2),...,K(N) of the integers 1,...,N

SYNOPSIS
     SUBROUTINE SLAPMT( FORWRD, M, N, X, LDX, K )

         LOGICAL        FORWRD

         INTEGER        LDX, M, N

         INTEGER        K( * )

         REAL           X( LDX, * )

IMPLEMENTATION
     These routines are part of the SCSL Scientific Library and can be loaded
     using either the -lscs or the -lscs_mp option.  The -lscs_mp option
     directs the linker to use the multi-processor version of the library.

     When linking to SCSL with -lscs or -lscs_mp, the default integer size is
     4 bytes (32 bits). Another version of SCSL is available in which integers
     are 8 bytes (64 bits).  This version allows the user access to larger
     memory sizes and helps when porting legacy Cray codes.  It can be loaded
     by using the -lscs_i8 option or the -lscs_i8_mp option. A program may use
     only one of the two versions; 4-byte integer and 8-byte integer library
     calls cannot be mixed.

PURPOSE
     SLAPMT rearranges the columns of the M by N matrix X as specified by the
     permutation K(1),K(2),...,K(N) of the integers 1,...,N. If FORWRD =
     .TRUE.,  forward permutation:

          X(*,K(J)) is moved X(*,J) for J = 1,2,...,N.

     If FORWRD = .FALSE., backward permutation:

          X(*,J) is moved to X(*,K(J)) for J = 1,2,...,N.


ARGUMENTS
     FORWRD  (input) LOGICAL
             = .TRUE., forward permutation = .FALSE., backward permutation

     M       (input) INTEGER
             The number of rows of the matrix X. M >= 0.

     N       (input) INTEGER
             The number of columns of the matrix X. N >= 0.
     X       (input/output) REAL array, dimension (LDX,N)
             On entry, the M by N matrix X.  On exit, X contains the permuted
             matrix X.

     LDX     (input) INTEGER
             The leading dimension of the array X, LDX >= MAX(1,M).

     K       (input) INTEGER array, dimension (N)
             On entry, K contains the permutation vector.

SEE ALSO
     INTRO_LAPACK(3S), INTRO_SCSL(3S)

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