_lag2_(3)

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💅 _lag2_(3) — Library Functions Manual 💅

okay so bestie, welcome to _lag2_(3) — the Library Functions Manual page for lag2, and it is literally about a general matrix situation: convert double <=> single. No cap, that's the vibe. 🎀

✨ NAME ✨

_lag2_ — lag2: general matrix, convert double <=> single. 💖

🦋 SYNOPSIS 🦋

🌈 Functions 🌈

  • subroutine clag2z (m, n, sa, ldsa, a, lda, info) — CLAG2Z converts a complex single precision matrix to a complex double precision matrix. 🧚
  • subroutine dlag2s (m, n, a, lda, sa, ldsa, info) — DLAG2S converts a double precision matrix to a single precision matrix. 🌸
  • subroutine slag2d (m, n, sa, ldsa, a, lda, info) — SLAG2D converts a single precision matrix to a double precision matrix. 🦋
  • subroutine zlag2c (m, n, a, lda, sa, ldsa, info) — ZLAG2C converts a complex double precision matrix to a complex single precision matrix. 💜

🔥 DETAILED DESCRIPTION 🔥

Bestie, this section is a whole mood: it just says Detailed Description and then rolls straight into Function Documentation. That's the tea. ☕✨

💜 FUNCTION DOCUMENTATION 💜

🧚 subroutine clag2z

subroutine clag2z (integer m, integer n, complex, dimension( ldsa, * ) sa, integer ldsa, complex*16, dimension( lda, * ) a, integer lda, integer info)

CLAG2Z converts a complex single precision matrix to a complex double precision matrix. 💫

🌟 Purpose 🌟

CLAG2Z converts a COMPLEX matrix, SA, to a COMPLEX*16 matrix, A. 🔥

Note that while it is possible to overflow while converting from double to single, it is not possible to overflow when converting from single to double. 👑

⚠️ This is an auxiliary routine so there is no argument checking. bestie, that means no safety net — respect it. 💅

🍓 Parameters 🍓

  • M — INTEGER. The number of lines of the matrix A. M >= 0.
  • N — INTEGER. The number of columns of the matrix A. N >= 0.
  • SA — COMPLEX array, dimension (LDSA,N). On entry, the M-by-N coefficient matrix SA.
  • LDSA — INTEGER. The leading dimension of the array SA. LDSA >= max(1,M).
  • A — COMPLEX*16 array, dimension (LDA,N). On exit, the M-by-N coefficient matrix A.
  • LDA — INTEGER. The leading dimension of the array A. LDA >= max(1,M).
  • INFO — INTEGER. = 0: successful exit.

🌸 Author 🌸

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

🎀 Definition 🎀

Definition at line 102 of file clag2z.f.

🦋 subroutine dlag2s

subroutine dlag2s (integer m, integer n, double precision, dimension( lda, * ) a, integer lda, real, dimension( ldsa, * ) sa, integer ldsa, integer info)

DLAG2S converts a double precision matrix to a single precision matrix. 💖

🌟 Purpose 🌟

DLAG2S converts a DOUBLE PRECISION matrix, A, to a SINGLE PRECISION matrix, SA. ✨

RMAX is the overflow for the SINGLE PRECISION arithmetic. DLAG2S checks that all the entries of A are between -RMAX and RMAX. If not, the conversion is aborted and a flag is raised. 🚨

⚠️ This is an auxiliary routine so there is no argument checking. no cap. 💅

🍓 Parameters 🍓

  • M — INTEGER. The number of lines of the matrix A. M >= 0.
  • N — INTEGER. The number of columns of the matrix A. N >= 0.
  • A — DOUBLE PRECISION array, dimension (LDA,N). On entry, the M-by-N coefficient matrix A.
  • LDA — INTEGER. The leading dimension of the array A. LDA >= max(1,M).
  • SA — REAL array, dimension (LDSA,N). On exit, if INFO=0, the M-by-N coefficient matrix SA; if INFO>0, the content of SA is unspecified.
  • LDSA — INTEGER. The leading dimension of the array SA. LDSA >= max(1,M).
  • INFO — INTEGER.
    • = 0: successful exit.
    • = 1: an entry of the matrix A is greater than the SINGLE PRECISION overflow threshold, in this case, the content of SA in exit is unspecified.
🚨 if INFO > 0, bestie, the content of SA is unspecified — do not trust it, periodt.

🌸 Author 🌸

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

🎀 Definition 🎀

Definition at line 107 of file dlag2s.f.

🧚 subroutine slag2d

subroutine slag2d (integer m, integer n, real, dimension( ldsa, * ) sa, integer ldsa, double precision, dimension( lda, * ) a, integer lda, integer info)

SLAG2D converts a single precision matrix to a double precision matrix. 🦋

🌟 Purpose 🌟

SLAG2D converts a SINGLE PRECISION matrix, SA, to a DOUBLE PRECISION matrix, A. 💜

Note that while it is possible to overflow while converting from double to single, it is not possible to overflow when converting from single to double. 👑

⚠️ This is an auxiliary routine so there is no argument checking. iykyk. 💅

🍓 Parameters 🍓

  • M — INTEGER. The number of lines of the matrix A. M >= 0.
  • N — INTEGER. The number of columns of the matrix A. N >= 0.
  • SA — REAL array, dimension (LDSA,N). On entry, the M-by-N coefficient matrix SA.
  • LDSA — INTEGER. The leading dimension of the array SA. LDSA >= max(1,M).
  • A — DOUBLE PRECISION array, dimension (LDA,N). On exit, the M-by-N coefficient matrix A.
  • LDA — INTEGER. The leading dimension of the array A. LDA >= max(1,M).
  • INFO — INTEGER. = 0: successful exit.

🌸 Author 🌸

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

🎀 Definition 🎀

Definition at line 103 of file slag2d.f.

💜 subroutine zlag2c

subroutine zlag2c (integer m, integer n, complex*16, dimension( lda, * ) a, integer lda, complex, dimension( ldsa, * ) sa, integer ldsa, integer info)

ZLAG2C converts a complex double precision matrix to a complex single precision matrix. 💫

🌟 Purpose 🌟

ZLAG2C converts a COMPLEX*16 matrix, SA, to a COMPLEX matrix, A. 👑

RMAX is the overflow for the SINGLE PRECISION arithmetic. ZLAG2C checks that all the entries of A are between -RMAX and RMAX. If not, the conversion is aborted and a flag is raised. 🚨

⚠️ This is an auxiliary routine so there is no argument checking. bestie, it's giving "no guardrails." 💅

🍓 Parameters 🍓

  • M — INTEGER. The number of lines of the matrix A. M >= 0.
  • N — INTEGER. The number of columns of the matrix A. N >= 0.
  • A — COMPLEX*16 array, dimension (LDA,N). On entry, the M-by-N coefficient matrix A.
  • LDA — INTEGER. The leading dimension of the array A. LDA >= max(1,M).
  • SA — COMPLEX array, dimension (LDSA,N). On exit, if INFO=0, the M-by-N coefficient matrix SA; if INFO>0, the content of SA is unspecified.
  • LDSA — INTEGER. The leading dimension of the array SA. LDSA >= max(1,M).
  • INFO — INTEGER.
    • = 0: successful exit.
    • = 1: an entry of the matrix A is greater than the SINGLE PRECISION overflow threshold, in this case, the content of SA in exit is unspecified.
🚨 if INFO > 0, the content of SA is unspecified — literally do not trust it, bestie.

🌸 Author 🌸

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

🎀 Definition 🎀

Definition at line 106 of file zlag2c.f.

👑 AUTHOR 👑

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