ZTPTTR(3)

🌸 NAME 🌸

okay so bestie, this is the ZTPTTR(3) page from the Library Functions Manual, and the NAME section is literally just this long file path, no cap:

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

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✨ SYNOPSIS ✨

🎀 Functions/Subroutines 🎀

here’s the headline moment, iykyk:

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

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

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💖 Function/Subroutine Documentation 💖

this is the full signature, bestie — every type and dimension staying exactly where it belongs:

subroutine ZTPTTR (character uplo, integer n, complex*16, dimension( * ) ap,
    complex*16, dimension( lda, * ) a, integer lda, integer info)

ZTPTTR copies a triangular matrix from the standard packed format (TP) to the standard full format (TR). iconic behavior, honestly. ✨

🦋 Purpose 🦋

ZTPTTR copies a triangular matrix A from standard packed format (TP) to standard full format (TR). it’s giving “packed queen makes her full-format debut,” and the details are sacred. 🫶

🌈 Parameters 🌈

okay so this is the parameter vibe check — no skipping, every single one matters. 💖

💅 UPLO 💅

UPLO is CHARACTER*1.

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

🦋 N 🦋

N is INTEGER.

The order of the matrix A. N >= 0.

🎀 AP 🎀

AP is COMPLEX*16 array, dimension ( N*(N+1)/2 ).

On entry, 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*16 array, dimension ( LDA, N ).

On exit, 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.

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 👑

shoutout to the author icons, periodt:

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

Definition at line 103 of file ztpttr.f. 🎀

👑 Author (auto-generated note) 👑

Generated automatically by Doxygen for LAPACK from the source code. 💅

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sign-off from the footer, bestie: LAPACK · Version 3.12.0 · /home/abui...RC/ztpttr.f(3). the footer didn’t hand me a date, so I’m not inventing one — that would be a no-cap violation. 💖✨