TESTING/MATGEN/dlarge.f(3)

🎀 TESTING/MATGEN/dlarge.f — LAPACK Library Functions Manual 🎀

okay so bestie, you found your way into TESTING/MATGEN/dlarge.f(3) and honestly? iconic of you. this is a Library Functions Manual page, and it's giving "small but mighty" energy. let's get into it 💅

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✨ SYNOPSIS ✨

🌸 Functions/Subroutines

• subroutine dlarge (n, a, lda, iseed, work, info) — DLARGE (that's literally the whole glow-up, no notes)

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💖 Function/Subroutine Documentation 💖

🦋 subroutine dlarge (integer n, double precision, dimension( lda, * ) a, integer lda, integer, dimension( 4 ) iseed, double precision, dimension( * ) work, integer info)

DLARGE

🌟 Purpose:

!>
!> DLARGE pre- and post-multiplies a real general n by n matrix A
!> with a random orthogonal matrix: A = U*D*U'.
!>

so basically, no cap: DLARGE takes your real general n by n matrix A and pre- and post-multiplies it with a random orthogonal matrix — the whole vibe is A = U*D*U'. slay 🔥

🎀 Parameters

• N

!>          N is INTEGER
!>          The order of the matrix A.  N >= 0.

N is an INTEGER, and it's the order of the matrix A. lowkey important: N >= 0. periodt ✨

• A

!>          A is DOUBLE PRECISION array, dimension (LDA,N)
!>          On entry, the original n by n matrix A.
!>          On exit, A is overwritten by U*A*U' for some random
!>          orthogonal matrix U.

A is a DOUBLE PRECISION array of dimension (LDA,N). on entry it's your original n by n matrix A, and on exit it gets overwritten by U*A*U' for some random orthogonal matrix U. yes bestie, overwritten — she does not keep the original, so don't come crying 😭

• LDA

!>          LDA is INTEGER
!>          The leading dimension of the array A.  LDA >= N.

LDA is an INTEGER, the leading dimension of the array A, and it must be LDA >= N. respect the constraint fr fr 🫶

• ISEED

!>          ISEED is INTEGER array, dimension (4)
!>          On entry, the seed of the random number generator; the array
!>          elements must be between 0 and 4095, and ISEED(4) must be
!>          odd.
!>          On exit, the seed is updated.

ISEED is an INTEGER array of dimension (4) — the seed of the random number generator, main character of the randomness. on entry, the array elements must be between 0 and 4095, and ISEED(4) must be odd. on exit, the seed is updated. so yeah, she changes while you're not looking 💀

• WORK

!>          WORK is DOUBLE PRECISION array, dimension (2*N)

WORK is a DOUBLE PRECISION array of dimension (2*N). that's it, that's the whole note. do your thing ✨

• INFO

!>          INFO is INTEGER
!>          = 0: successful exit
!>          < 0: if INFO = -i, the i-th argument had an illegal value

INFO is an INTEGER and it's the vibe check at the end:

• = 0: successful exit, we ate 👑
• < 0: if INFO = -i, the i-th argument had an illegal value. so like, somebody did NOT follow the rules 🙈

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💜 Author

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

Definition at line 86 of file dlarge.f.

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🌈 Author (yes, again)

Generated automatically by Doxygen for LAPACK from the source code. be nice to the robots, they wrote this for us 🧚

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ok that's the whole page bestie, go forth and call dlarge responsibly. LDA >= N and ISEED(4) odd, or it's not gonna be a cute moment 💖

💅 LAPACK — Version 3.12.0 — TESTING/MATGEN/dlarge.f(3) 💅

mwah, bye bestie, tysm for reading 🎀🦋💜