gonum.org/v1/gonum@v0.14.0/internal/asm/f64/dot.go (about)

     1  // Copyright ©2015 The Gonum Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build !amd64 || noasm || gccgo || safe
     6  // +build !amd64 noasm gccgo safe
     7  
     8  package f64
     9  
    10  // DotUnitary is
    11  //
    12  //	for i, v := range x {
    13  //		sum += y[i] * v
    14  //	}
    15  //	return sum
    16  func DotUnitary(x, y []float64) (sum float64) {
    17  	for i, v := range x {
    18  		sum += y[i] * v
    19  	}
    20  	return sum
    21  }
    22  
    23  // DotInc is
    24  //
    25  //	for i := 0; i < int(n); i++ {
    26  //		sum += y[iy] * x[ix]
    27  //		ix += incX
    28  //		iy += incY
    29  //	}
    30  //	return sum
    31  func DotInc(x, y []float64, n, incX, incY, ix, iy uintptr) (sum float64) {
    32  	for i := 0; i < int(n); i++ {
    33  		sum += y[iy] * x[ix]
    34  		ix += incX
    35  		iy += incY
    36  	}
    37  	return sum
    38  }