CTPTTR(3)

💖 CTPTTR(3) — LAPACK Library Functions Manual 💖

okay bestie, welcome to the LAPACK Library Functions Manual page for ctpttr.f(3). This whole page is about one iconic little copy move: triangular matrix, packed format (TP) → full format (TR). No cap. 🦋

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🌸 NAME 🌸

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/SRC/ctpttr.f

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✨ SYNOPSIS ✨

🧚 Functions/Subroutines

subroutine CTPTTR (uplo, n, ap, a, lda, info)

CTPTTR copies a triangular matrix from the standard packed format (TP) to the standard full format (TR). 💅

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💅 Function/Subroutine Documentation 💅

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

CTPTTR copies a triangular matrix from the standard packed format (TP) to the standard full format (TR).

🎯 Purpose 🎯

The purpose is literally this, bestie:

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

🎀 Parameters 🎀

UPLO

UPLO is CHARACTER*1.

= 'U':  A is upper triangular.
= 'L':  A is lower triangular.

N

N is INTEGER. It's the order of the matrix A. N >= 0. 🫶

AP

AP is COMPLEX array, dimension ( N*(N+1)/2 ). On entry, it's 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.

A

A is COMPLEX array, dimension ( LDA, N ). On exit, 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. 💀

LDA

LDA is INTEGER. It's the leading dimension of the array A. LDA >= max(1,N). 📏

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 ctpttr.f.

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👑 Author 👑

Generated automatically by Doxygen for LAPACK from the source code.

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okay that's the whole page, bestie. Footer sign-off: LAPACK Version 3.12.0, from /home/abui...RC/ctpttr.f(3) — slay and stay triangular. 💖✨