ZTRTTP(3)

🎀 NAME 🎀

Bestie, this is ZTRTTP(3) from the Library Functions Manual — the source file is chillin’ at /home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/SRC/ztrttp.f. It’s giving “copy a triangular matrix from full format to packed format” energy, and honestly? Iconic.

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✨ SYNOPSIS ✨

Functions/Subroutines

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

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🦋 Function/Subroutine Documentation 🦋

Okay so here’s the actual signature, character-for-character, no cap:

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

This routine’s whole personality is: ZTRTTP copies a triangular matrix from the standard full format (TR) to the standard packed format (TP). Periodt.

🌸 Purpose 🌸

The purpose block is literally serving: ZTRTTP copies a triangular matrix A from full format (TR) to standard packed format (TP). That’s the quest, bestie. Go off.

💅 Parameters 💅

• UPLO — UPLO is CHARACTER*1
  • = 'U': A is upper triangular;
  • = 'L': A is lower triangular.
• N — N is INTEGER — the order of the matrices AP and A. N >= 0.
• A — A is COMPLEX*16 array, dimension (LDA,N). On entry, this is 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. Slay.
• LDA — LDA is INTEGER — the leading dimension of the array A. LDA >= max(1,N). Respect the boundary, bestie.
• AP — AP is COMPLEX*16 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.
• 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 ztrttp.f.

👑 Author (Doxygen’s lil note) 👑

Generated automatically by Doxygen for LAPACK from the source code.

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That’s the tea. 🍓 LAPACK Version 3.12.0, from /home/abui...RC/ztrttp.f(3) — go forth and pack those triangles, bestie. 💖✨