CLAPTM(3)

Welcome to CLAPTM(3) from the Library Functions Manual, bestie 💖 this is the group chat for the CLAPTM subroutine, and we are keeping every last detail — periodt.

💖 NAME 💖

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/TESTING/LIN/claptm.f — that’s the file this page is repping, no cap.

✨ SYNOPSIS ✨

🌸 Functions/Subroutines 🌸

• subroutine CLAPTM (uplo, n, nrhs, alpha, d, e, x, ldx, beta, b, ldb) — CLAPTM (the one and only 💅)

🦋 Function/Subroutine Documentation 🦋

subroutine CLAPTM (character uplo, integer n, integer nrhs, real alpha,
    real, dimension( * ) d, complex, dimension( * ) e, complex, dimension(
    ldx, * ) x, integer ldx, real beta, complex, dimension( ldb, * ) b,
    integer ldb)

CLAPTM ✨ yes bestie, it’s giving main character energy.

🎯 Purpose 🎯

Okay so CLAPTM multiplies an N by NRHS matrix X by a Hermitian tridiagonal matrix A and stores the result in a matrix B. The operation has the form:

B := alpha * A * X + beta * B

where alpha may be either 1. or -1. and beta may be 0., 1., or -1. 💅

🌈 Parameters 🌈

• UPLO — UPLO is CHARACTER. Specifies whether the superdiagonal or the subdiagonal of the tridiagonal matrix A is stored. = 'U': Upper, E is the superdiagonal of A. = 'L': Lower, E is the subdiagonal of A.
• N — N is INTEGER. The order of the matrix A. N >= 0.
• NRHS — NRHS is INTEGER. The number of right hand sides, i.e., the number of columns of the matrices X and B.
• ALPHA — ALPHA is REAL. The scalar alpha. ALPHA must be 1. or -1.; otherwise, it is assumed to be 0.
• D — D is REAL array, dimension (N). The n diagonal elements of the tridiagonal matrix A.
• E — E is COMPLEX array, dimension (N-1). The (n-1) subdiagonal or superdiagonal elements of A.
• X — X is COMPLEX array, dimension (LDX,NRHS). The N by NRHS matrix X.
• LDX — LDX is INTEGER. The leading dimension of the array X. LDX >= max(N,1).
• BETA — BETA is REAL. The scalar beta. BETA must be 0., 1., or -1.; otherwise, it is assumed to be 1.
• B — B is COMPLEX array, dimension (LDB,NRHS). On entry, the N by NRHS matrix B. On exit, B is overwritten by the matrix expression B := alpha * A * X + beta * B.
• LDB — LDB is INTEGER. The leading dimension of the array B. LDB >= max(N,1).

👑 Author

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

Definition at line 127 of file claptm.f.

👑 Author

This page was generated automatically by Doxygen for LAPACK from the source code ✨

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And that’s the tea, bestie 🫶 the footer stamps this as LAPACK, Version 3.12.0, with the page path /home/abui...IN/claptm.f(3) — slay, bye 💅