SLATTP(3)

💖 SLATTP(3) 💖

From the LAPACK Library Functions Manual. Header path: /home/abui...IN/slattp.f(3). Okay bestie, let’s get into the triangular test-matrix tea. ☕✨

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🎀 NAME 🎀

The source file is /home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/TESTING/LIN/slattp.f.

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✨ SYNOPSIS ✨

🧚 Functions/Subroutines 🧚

Here’s the callable vibe:

subroutine SLATTP (imat, uplo, trans, diag, iseed, n, a, b, work, info)

And the routine is literally named SLATTP.

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👑 Function/Subroutine Documentation 👑

🌸 subroutine SLATTP 🌸

Full signature, character-for-character:

subroutine SLATTP (integer imat, character uplo, character trans, character diag, integer, dimension( 4 ) iseed, integer n, real, dimension( * ) a, real, dimension( * ) b, real, dimension( * ) work, integer info)

SLATTP

🦋 Purpose:

Okay so SLATTP is the icon that generates a triangular test matrix in packed storage. The combo of IMAT and UPLO uniquely specifies the properties of that test matrix, and it comes back to you in the array AP. 💅

💅 Parameters 💅

• IMAT — INTEGER. An integer key describing which matrix to generate for this path. 🔑
• UPLO — CHARACTER*1. Specifies whether the matrix A will be upper or lower triangular.
  • = 'U': Upper triangular
  • = 'L': Lower triangular
• TRANS — CHARACTER*1. Specifies whether the matrix or its transpose will be used.
  • = 'N': No transpose
  • = 'T': Transpose
  • = 'C': Conjugate transpose (= Transpose)
• DIAG — CHARACTER*1. Specifies whether or not the matrix A is unit triangular.
  • = 'N': Non-unit triangular
  • = 'U': Unit triangular
• ISEED — INTEGER array, dimension (4). The seed vector for the random number generator (used in SLATMS). Modified on exit. 🎲
• N — INTEGER. The order of the matrix to be generated.
• A — REAL array, dimension (N*(N+1)/2). 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((j-1)*j/2 + i) = A(i,j) for 1<=i<=j;
if UPLO = 'L',
   AP((j-1)*(n-j) + j*(j+1)/2 + i-j) = A(i,j) for j<=i<=n.

• B — REAL array, dimension (N). The right hand side vector, if IMAT > 10.
• WORK — REAL array, dimension (3*N).
• INFO — INTEGER.
  • = 0: successful exit
  • < 0: if INFO = -k, the k-th argument had an illegal value

🌸 Author 🌸

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

Definition at line 123 of file slattp.f.

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🫶 Author 🫶

Generated automatically by Doxygen for LAPACK from the source code.

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Cute sign-off: this page is from LAPACK Version 3.12.0, footer source path /home/abui...IN/slattp.f(3), and the footer doesn’t list a date, so no date to give you, bestie. 💖