DSDOT(3)

🌸 DSDOT(3) — Library Functions Manual 🌸

okay so bestie, gather round, because this is the manpage for /home/abui...SRC/dsdot.f(3) and it's lowkey a whole vibe. it lives in the Library Functions Manual section, and it's fr fr just a Fortran file doing math with more precision than your situationship. 💅

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✨ NAME ✨

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/BLAS/SRC/dsdot.f

like, that's the whole name. that's the path. it's giving "I was generated by a build system and I'm proud of it." 🎀

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🦋 SYNOPSIS 🦋

Functions/Subroutines

double precision function DSDOT (n, sx, incx, sy, incy)
    DSDOT

that's it. that's the girl. ✨

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👑 Function/Subroutine Documentation 👑

double precision function DSDOT (integer n, real, dimension(*) sx, integer
    incx, real, dimension(*) sy, integer incy)

DSDOT

🎯 Purpose 🎯

!> !> Compute the inner product of two vectors with extended !> precision accumulation and result. !> !> Returns D.P. dot product accumulated in D.P., for S.P. SX and SY !> DSDOT = sum for I = 0 to N-1 of SX(LX+I*INCX) * SY(LY+I*INCY), !> where LX = 1 if INCX .GE. 0, else LX = 1+(1-N)*INCX, and LY is !> defined in a similar way using INCY. !>

so basically: you feed it two single-precision vectors, it multiplies them element by element, adds it all up, and hands you back a double precision result. the accumulation is double precision too, so she's careful the whole way through. highkey iconic behavior. 🧮💖

and yes, that LX / LY business is just how she figures out where to start reading when your INCX is negative. don't overthink it, she's got it handled.

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🌈 Parameters 🌈

• N — between you and me, she's an INTEGER.

!>          N is INTEGER
!>         number of elements in input vector(s)
!>

• SX — SX is REAL array, dimension(N), a single precision vector with N elements.

!>          SX is REAL array, dimension(N)
!>         single precision vector with N elements
!>

• INCX — she's an INTEGER, and she's the storage spacing between elements of SX. like, the stride. the vibe spacing. 🦋

!>          INCX is INTEGER
!>          storage spacing between elements of SX
!>

• SY — SY is REAL array, dimension(N), single precision vector with N elements. the other half of the duo, obvi. 👯

!>          SY is REAL array, dimension(N)
!>         single precision vector with N elements
!>

• INCY — INTEGER, storage spacing between elements of SY. same deal as INCX but for the other vector. 💫

!>          INCY is INTEGER
!>         storage spacing between elements of SY
!>

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💜 Returns 💜

DSDOT

!>          DSDOT is DOUBLE PRECISION
!>         DSDOT  double precision dot product (zero if N.LE.0)
!>

so: the result is DOUBLE PRECISION, and if N.LE.0 you get zero. no drama, no error, just a clean 0. she's not gonna make a scene about it. 😌

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🫶 Author 🫶

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

four whole institutions. the group project that actually got finished. 🔥

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🌸 Further Details: 🌸

!>

...that's it. that's the further details. an empty comment block. honestly? relatable. sometimes there's just nothing to add and you go to bed. 😭💀

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📚 References: 📚

!>
!>
!>  C. L. Lawson, R. J. Hanson, D. R. Kincaid and F. T.
!>  Krogh, Basic linear algebra subprograms for Fortran
!>  usage, Algorithm No. 539, Transactions on Mathematical
!>  Software 5, 3 (September 1979), pp. 308-323.
!>
!>  REVISION HISTORY  (YYMMDD)
!>
!>  791001  DATE WRITTEN
!>  890831  Modified array declarations.  (WRB)
!>  890831  REVISION DATE from Version 3.2
!>  891214  Prologue converted to Version 4.0 format.  (BAB)
!>  920310  Corrected definition of LX in DESCRIPTION.  (WRB)
!>  920501  Reformatted the REFERENCES section.  (WRB)
!>  070118  Reformat to LAPACK style (JL)
!>

not the revision history going back to 791001. she's been on her grind since 1979 and still shows up to work. main character energy fr. 🌟

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📍 Definition at line 118 of file dsdot.f. 📍

yes bestie, line 118. we counted. 🎀

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💅 Author 💅

Generated automatically by Doxygen for LAPACK from the source code.

so nobody wrote this manpage, a robot did. and honestly the robot ate. 🤖✨

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ok that's the whole page!! every flag, every parameter, every revision date, all of it. no skips, no cuts. periodt. 🫶

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and that's a wrap, bestie — this little love letter is from LAPACK, Version 3.12.0, dated /home/abui...SRC/dsdot.f(3). go forth and dot-product responsibly. 💖🌈⭐