SRC/ctrttp.f(3)

💖 NAME 💖

okay bestie, this is SRC/ctrttp.f — yes, that's the page name — and it's chillin' in the Library Functions Manual. The star of the show is ctrttp, a subroutine that literally copies a triangular matrix from full format (TR) to packed format (TP). iconic behavior, no cap. 💅

✨ SYNOPSIS ✨

🌸 Functions/Subroutines 🌸

• subroutine ctrttp (uplo, n, a, lda, ap, info) — CTRTTP copies a triangular matrix from the standard full format (TR) to the standard packed format (TP). slay.

🛠️ Function/Subroutine Documentation 🛠️

subroutine ctrttp (character uplo, integer n, complex, dimension( lda, * ) a, integer lda, complex, dimension( * ) ap, integer info)

CTRTTP copies a triangular matrix from the standard full format (TR) to the standard packed format (TP). fr fr, that's the whole plot. 🦋

🎯 Purpose

CTRTTP copies a triangular matrix A from full format (TR) to standard packed format (TP). ✨

🎀 Parameters 🎀

• UPLO — UPLO is CHARACTER*1. = 'U': A is upper triangular; = 'L': A is lower triangular. choose your vibe. 💫
• N — N is INTEGER; it's the order of the matrices AP and A. N >= 0. no negative nonsense, bestie.
• A — A is COMPLEX array, dimension (LDA,N). On entry, it's the triangular matrix A. If UPLO = 'U', the leading N-by-N upper triangular part of A contains the upper triangular part of the matrix A, and the strictly lower triangular part of A is not referenced. If UPLO = 'L', the leading N-by-N lower triangular part of A contains the lower triangular part of the matrix A, and the strictly upper triangular part of A is not referenced. read the room, lower/upper. 🙈
• LDA — LDA is INTEGER; it's the leading dimension of the array A. LDA >= max(1,N). periodt.
• AP — AP is COMPLEX array, dimension ( N*(N+1)/2 ). On exit, it holds the upper or lower triangular matrix A, packed columnwise in a linear array. The j-th column of A is stored in the array AP as follows:

if UPLO = 'U', AP(i + (j-1)*j/2) = A(i,j) for 1<=i<=j;
if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = A(i,j) for j<=i<=n.

that formula is giving main character energy, honestly. 🧚

• INFO — INFO is INTEGER. = 0: successful exit; < 0: if INFO = -i, the i-th argument had an illegal value. 💀

👑 Author 👑

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

Definition at line 103 of file ctrttp.f. 🎀

📜 Author 📜

Generated automatically by Doxygen for LAPACK from the source code. yes bestie, the robots wrote the paperwork. 🤖✨

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and that's the page, bestie — LAPACK Version 3.12.0, SRC/ctrttp.f(3), mwah 💅💖