SRC/clapmt.f(3)

💅 SRC/clapmt.f(3) — Library Functions Manual, but make it group chat 💅

okay bestie, welcome to the SRC/clapmt.f(3) page. The manual-name energy here is Library Functions Manual, and I’m folding that in right at the top so we don’t waste a whole fancy header line on it. This is the clapmt lore, and it’s giving “column permutation but make it Fortran.” 💖

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NAME

SRC/clapmt.f — literally the name. That’s the whole crumb. 🎀

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SYNOPSIS

Functions/Subroutines ✨

• subroutine clapmt (forwrd, m, n, x, ldx, k) — CLAPMT performs a forward or backward permutation of the columns of a matrix. No cap, that’s the one-liner. 🦋

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✨ Function/Subroutine Documentation ✨

Here’s the full signature, exactly as it appears, bestie:

subroutine clapmt (logical forwrd, integer m, integer n, complex, dimension(
       ldx, * ) x, integer ldx, integer, dimension( * ) k)

CLAPMT performs a forward or backward permutation of the columns of a matrix. That’s the main-character job. 👑

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Purpose 💖

Okay so CLAPMT 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. That’s the whole vibe. 🌸

If FORWRD = .TRUE., it’s a forward permutation:

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

If FORWRD = .FALSE., it’s a backward permutation:

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

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Parameters 🫶

• FORWRD — is LOGICAL; = .TRUE. means forward permutation, = .FALSE. means backward permutation. Lowkey the switch for the whole direction situation. 🔁
• M — is INTEGER; the number of rows of the matrix X. M >= 0. Respect the row count. ✨
• N — is INTEGER; the number of columns of the matrix X. N >= 0. The column count is also iconic. 🎀
• X — is COMPLEX array, dimension (LDX,N); on entry, the M by N matrix X; on exit, X contains the permuted matrix X. It comes back changed, bestie. 💅
• LDX — is INTEGER; the leading dimension of the array X, LDX >= MAX(1,M). Don’t play with the leading dimension. 🚨
• 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. It does the behind-the-scenes work and then puts itself back, fr fr. 🧚

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Author 👑

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

Definition at line 103 of file clapmt.f.

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Author (the generated one) 🤖

Generated automatically by Doxygen for LAPACK from the source code.

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That’s the whole page, bestie — no missing flags, no skipped parameter crumbs, no invented lore. Periodt. 💖✨

The footer vibe is: LAPACK, Version 3.12.0, source SRC/clapmt.f(3) — that’s the cute sign-off. 🫶🎀