SRC/zlag2c.f(3)

💖 SRC/zlag2c.f(3) 💖

okay bestie, welcome to the Library Functions Manual page for SRC/zlag2c.f ✨ this one is short and sweet, but we are still reading every single line because that is the vibe.

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✨ NAME ✨

SRC/zlag2c.f — that’s the name, bestie. iconic, brief, to the point 💅

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🌈 SYNOPSIS 🌈

Functions/Subroutines

• subroutine zlag2c (m, n, a, lda, sa, ldsa, info) — ZLAG2C converts a complex double precision matrix to a complex single precision matrix. 🦋

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🎀 Function/Subroutine Documentation 🎀

the zlag2c subroutine 🫶

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. no cap, that’s the whole assignment 💖

Purpose 🌸

The Purpose section is sending this exact message:

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. yes bestie, it said what it said 🫡

tiny vibe check: the page really writes the Purpose line with SA converting to A, while the parameter list has A as the COMPLEX*16 input and SA as the COMPLEX output. I’m not editing the docs, I’m just reading them 💀 keep the variable names exactly like the page does.

Parameters 💅

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

Author 👑

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

Definition at line 106 of file zlag2c.f.

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🫶 Author 🫶

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