SRC/stpttr.f(3)

💖 SRC/stpttr.f(3) 💖

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✨ NAME ✨

SRC/stpttr.f

🦋 SYNOPSIS 🦋

Functions/Subroutines

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

🌟 Function/Subroutine Documentation 🌟

subroutine stpttr (character uplo, integer n, real, dimension( * ) ap, real,
    dimension( lda, * ) a, integer lda, integer info)

STPTTR copies a triangular matrix from the standard packed format (TP) to the standard full format (TR). That’s the whole main-character job, no cap. 🫶

💡 Purpose 💡

Here’s the purpose block, kept exactly as the source has it:

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

So in group-chat terms: it takes triangular matrix A from standard packed format (TP) and puts it into 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 a REAL 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 a REAL 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. 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 stpttr.f.

💜 Author 💜

Generated automatically by Doxygen for LAPACK from the source code.

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