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.

          FORWRD is LOGICAL
          = .TRUE., forward permutation
          = .FALSE., backward permutation

          M is INTEGER
          The number of rows of the matrix X. M >= 0.

          N is INTEGER
          The number of columns of the matrix X. N >= 0.

          X is REAL array, dimension (LDX,N)
          On entry, the M by N matrix X.
          On exit, X contains the permuted matrix X.

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

          K is INTEGER array, dimension (N)
          On entry, K contains the permutation vector. K is used as
          internal workspace, but reset to its original value on
          output.