TESTING/LIN/clattb.f(3)

okay bestie, welcome to TESTING/LIN/clattb.f(3) — this is the Library Functions Manual page for CLATTB, and it’s giving extremely specific test-matrix energy. 💅

✨ NAME ✨

• TESTING/LIN/clattb.f — that’s the file this page is about, periodt.

🌸 SYNOPSIS 🌸

🧚 Functions/Subroutines 🧚

       subroutine clattb (imat, uplo, trans, diag, iseed, n, kd, ab, ldab, b,
           work, rwork, info)
           CLATTB

🦋 Function/Subroutine Documentation 🦋

   subroutine clattb (integer imat, character uplo, character trans, character
       diag, integer, dimension( 4 ) iseed, integer n, integer kd, complex,
       dimension( ldab, * ) ab, integer ldab, complex, dimension( * ) b,
       complex, dimension( * ) work, real, dimension( * ) rwork, integer info)
       CLATTB

💅 Purpose 💅

okay so CLATTB generates a triangular test matrix in 2-dimensional storage. IMAT and UPLO uniquely specify the properties of the test matrix, and that matrix is returned in the array A. That’s the whole vibe — test matrix, specified, returned, slay. ✨

🎀 Parameters 🎀

• IMAT — IMAT is INTEGER. It’s the integer key describing which matrix to generate for this path. 🔑
• UPLO — UPLO is CHARACTER*1. Specifies whether the matrix A will be upper or lower triangular.
  • = 'U': Upper triangular
  • = 'L': Lower triangular
• TRANS — TRANS is CHARACTER*1. Specifies whether the matrix or its transpose will be used.
  • = 'N': No transpose
  • = 'T': Transpose
  • = 'C': Conjugate transpose (= transpose)
• DIAG — DIAG is CHARACTER*1. Specifies whether or not the matrix A is unit triangular.
  • = 'N': Non-unit triangular
  • = 'U': Unit triangular
• ISEED — ISEED is INTEGER array, dimension (4). The seed vector for the random number generator (used in CLATMS). Modified on exit. 🌀
• N — N is INTEGER. The order of the matrix to be generated.
• KD — KD is INTEGER. The number of superdiagonals or subdiagonals of the banded triangular matrix A. KD >= 0.
• AB — AB is COMPLEX array, dimension (LDAB,N). The upper or lower triangular banded matrix A, stored in the first KD+1 rows of AB. Let j be a column of A, 1<=j<=n.
  • If UPLO = 'U', AB(kd+1+i-j,j) = A(i,j) for max(1,j-kd)<=i<=j.
  • If UPLO = 'L', AB(1+i-j,j) = A(i,j) for j<=i<=min(n,j+kd).
• LDAB — LDAB is INTEGER. The leading dimension of the array AB. LDAB >= KD+1.
• B — B is COMPLEX array, dimension (N). That’s it, bestie. 🫶
• WORK — WORK is COMPLEX array, dimension (2*N).
• RWORK — RWORK is REAL array, dimension (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 139 of file clattb.f.

🌈 Author 🌈

Generated automatically by Doxygen for LAPACK from the source code.

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mwah 💋 — this is LAPACK Version 3.12.0 for TESTING/LIN/clattb.f(3), and the footer is literally that version/page combo. Bye bestie! 🎀