SRC/slapmt.f(3)

NAME 🌸

Okay bestie, this is the Library Functions Manual page for SRC/slapmt.f — yes, the SRC/slapmt.f(3) one 💖. It’s the home of slapmt, the subroutine that does a forward or backward permutation of the columns of a matrix. Manual name folded in near the top, no cap. 🎀

SYNOPSIS 🎀

Functions/Subroutines

Here’s the callable vibe:

subroutine slapmt (forwrd, m, n, x, ldx, k)

SLAPMT performs a forward or backward permutation of the columns of a matrix. ✨

Function/Subroutine Documentation 💖

subroutine slapmt (logical forwrd, integer m, integer n, real, dimension(
ldx, * ) x, integer ldx, integer, dimension( * ) k)

SLAPMT performs a forward or backward permutation of the columns of a matrix.

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.

Parameters

• FORWRD — FORWRD is LOGICAL; = .TRUE., forward permutation; = .FALSE., backward permutation.
• M — M is INTEGER; the number of rows of the matrix X. M >= 0.
• N — N is INTEGER; the number of columns of the matrix X. N >= 0.
• X — X is REAL array, dimension (LDX,N); on entry, the M by N matrix X; on exit, X contains the permuted matrix X.
• LDX — LDX is INTEGER; the leading dimension of the array X, LDX >= MAX(1,M).
• K — 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.

Author

• Univ. of Tennessee
• Univ. of California Berkeley
• Univ. of Colorado Denver
• NAG Ltd.

Definition at line 103 of file slapmt.f.

Author 💅

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