forked from hrautila/linalg
/
level1.go
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/
level1.go
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// Copyright (c) Harri Rautila, 2012
// This file is part of github.com/hrautila/linalg/blas package.
// It is free software, distributed under the terms of GNU Lesser General Public
// License Version 3, or any later version. See the COPYING tile included in this archive.
package blas
import (
"github.com/hrautila/linalg"
"github.com/hrautila/matrix"
"errors"
"math"
"math/cmplx"
)
// Returns the Euclidean norm of a vector (returns ||x||_2).
//
// ARGUMENTS
// X float or complex matrix
//
// OPTIONS
// n integer. If n<0, the default value of n is used.
// The default value is equal to 1+(len(x)-offsetx-1)/incx or 0
// if len(x) > offsetx+1
// inc positive integer
// offset nonnegative integer
//
func Nrm2(X matrix.Matrix, opts ...linalg.Option) (v matrix.Scalar) {
v = matrix.FScalar(math.NaN())
ind := linalg.GetIndexOpts(opts...)
err := check_level1_func(ind, fnrm2, X, nil)
if err != nil {
return
}
if ind.Nx == 0 {
return
}
switch X.(type) {
case *matrix.ComplexMatrix:
Xa := X.(*matrix.ComplexMatrix).ComplexArray()
v = matrix.FScalar(dznrm2(ind.Nx, Xa[ind.OffsetX:], ind.IncX))
case *matrix.FloatMatrix:
Xa := X.(*matrix.FloatMatrix).FloatArray()
v = matrix.FScalar(dnrm2(ind.Nx, Xa[ind.OffsetX:], ind.IncX))
default:
//err = errors.New("not implemented for parameter types", )
}
return
}
// Returns ||Re x||_1 + ||Im x||_1.
//
// ARGUMENTS
// X float or complex matrix
//
// OPTIONS
// n integer. If n<0, the default value of n is used.
// The default value is equal to n = 1+(len(x)-offset-1)/inc or 0 if
// len(x) > offset+1
// inc positive integer
// offset nonnegative integer
//
func Asum(X matrix.Matrix, opts ...linalg.Option) (v matrix.Scalar) {
v = matrix.FScalar(math.NaN())
ind := linalg.GetIndexOpts(opts...)
err := check_level1_func(ind, fasum, X, nil)
if err != nil {
return
}
if ind.Nx == 0 {
return
}
switch X.(type) {
case *matrix.ComplexMatrix:
Xa := X.(*matrix.ComplexMatrix).ComplexArray()
v = matrix.FScalar(dzasum(ind.Nx, Xa[ind.OffsetX:], ind.IncX))
case *matrix.FloatMatrix:
Xa := X.(*matrix.FloatMatrix).FloatArray()
v = matrix.FScalar(dasum(ind.Nx, Xa[ind.OffsetX:], ind.IncX))
//default:
// err = errors.New("not implemented for parameter types", )
}
return
}
// Returns Y = X^T*Y for real or complex X, Y.
//
// ARGUMENTS
// X float or complex matrix
// Y float or complex matrix. Must have the same type as X.
//
// OPTIONS
// n integer. If n<0, the default value of n is used.
// The default value is equal to nx = 1+(len(x)-offsetx-1)/incx or 0 if
// len(x) > offsetx+1. If the default value is used, it must be equal to
// ny = 1+(len(y)-offsetx-1)/|incy| or 0 if len(y) > offsety+1
// incx nonzero integer, [default=1]
// incy nonzero integer, [default=1]
// offsetx nonnegative integer, [default=0]
// offsety nonnegative integer, [default=0]
//
func Dotu(X, Y matrix.Matrix, opts ...linalg.Option) (v matrix.Scalar) {
v = matrix.FScalar(math.NaN())
//cv = cmplx.NaN()
ind := linalg.GetIndexOpts(opts...)
err := check_level1_func(ind, fdot, X, Y)
if err != nil {
return
}
if ind.Nx == 0 {
return
}
sameType := matrix.EqualTypes(X, Y)
if ! sameType {
err = errors.New("arrays not of same type")
return
}
switch X.(type) {
case *matrix.ComplexMatrix:
Xa := X.(*matrix.ComplexMatrix).ComplexArray()
Ya := Y.(*matrix.ComplexMatrix).ComplexArray()
v = matrix.CScalar(zdotu(ind.Nx, Xa[ind.OffsetX:], ind.IncX, Ya[ind.OffsetY:], ind.IncY))
case *matrix.FloatMatrix:
Xa := X.(*matrix.FloatMatrix).FloatArray()
Ya := Y.(*matrix.FloatMatrix).FloatArray()
v = matrix.FScalar(ddot(ind.Nx, Xa[ind.OffsetX:], ind.IncX, Ya[ind.OffsetY:], ind.IncY))
//default:
// err = errors.New("not implemented for parameter types", )
}
return
}
// Returns Y = X^H*Y for real or complex X, Y.
//
// ARGUMENTS
// X float or complex matrix
// Y float or complex matrix. Must have the same type as X.
//
// OPTIONS
// n integer. If n<0, the default value of n is used.
// The default value is equal to nx = 1+(len(x)-offsetx-1)/incx or 0 if
// len(x) > offsetx+1. If the default value is used, it must be equal to
// ny = 1+(len(y)-offsetx-1)/|incy| or 0 if len(y) > offsety+1
// incx nonzero integer [default=1]
// incy nonzero integer [default=1]
// offsetx nonnegative integer [default=0]
// offsety nonnegative integer [default=0]
//
func Dot(X, Y matrix.Matrix, opts ...linalg.Option) (v matrix.Scalar) {
v = matrix.FScalar(math.NaN())
//cv = cmplx.NaN()
ind := linalg.GetIndexOpts(opts...)
err := check_level1_func(ind, fdot, X, Y)
if err != nil {
return
}
if ind.Nx == 0 {
return matrix.FScalar(0.0)
}
sameType := matrix.EqualTypes(X, Y)
if ! sameType {
err = errors.New("arrays not of same type")
return
}
switch X.(type) {
case *matrix.ComplexMatrix:
Xa := X.(*matrix.ComplexMatrix).ComplexArray()
Ya := Y.(*matrix.ComplexMatrix).ComplexArray()
v = matrix.CScalar(zdotc(ind.Nx, Xa[ind.OffsetX:], ind.IncX, Ya[ind.OffsetY:], ind.IncY))
case *matrix.FloatMatrix:
Xa := X.(*matrix.FloatMatrix).FloatArray()
Ya := Y.(*matrix.FloatMatrix).FloatArray()
v = matrix.FScalar(ddot(ind.Nx, Xa[ind.OffsetX:], ind.IncX, Ya[ind.OffsetY:], ind.IncY))
//default:
// err = errors.New("not implemented for parameter types", )
}
return
}
// Interchanges two vectors (X <-> Y).
//
// ARGUMENTS
// X float or complex matrix
// Y float or complex matrix. Must have the same type as X.
//
// OPTIONS
// n integer. If n<0, the default value of n is used.
// The default value is equal to 1+(len(x)-offsetx-1)/abs(incx) or
// 0 if len(x) > offsetx+1. Also if the default value is used,
// it must be equal to 1+(len(y)-offsetx-1)/abs(incy) or 0 if
// len(y) > offsety + 1.
// incx nonzero integer
// incy nonzero integer
// offsetx nonnegative integer
// offsety nonnegative integer;
//
func Swap(X, Y matrix.Matrix, opts ...linalg.Option) (err error) {
ind := linalg.GetIndexOpts(opts...)
err = check_level1_func(ind, fswap, X, Y)
if err != nil {
return
}
if ind.Nx == 0 {
return
}
//if ind.Nx != ind.Ny {
// err = errors.New("arrays have unequal default lengths")
// return
//}
sameType := matrix.EqualTypes(X, Y)
if ! sameType {
err = errors.New("arrays not same type")
return
}
switch X.(type) {
case *matrix.ComplexMatrix:
Xa := X.(*matrix.ComplexMatrix).ComplexArray()
Ya := Y.(*matrix.ComplexMatrix).ComplexArray()
zswap(ind.Nx, Xa[ind.OffsetX:], ind.IncX, Ya[ind.OffsetY:], ind.IncY)
case *matrix.FloatMatrix:
Xa := X.(*matrix.FloatMatrix).FloatArray()
Ya := Y.(*matrix.FloatMatrix).FloatArray()
dswap(ind.Nx, Xa[ind.OffsetX:], ind.IncX, Ya[ind.OffsetY:], ind.IncY)
default:
err = errors.New("not implemented for parameter types", )
}
return
}
// Copies a vector X to a vector Y (Y := X).
//
// ARGUMENTS
// X float or complex matrix
// Y float or complex matrix. Must have the same type as X.
//
// OPTIONS
// n integer. If n<0, the default value of n is used.
// The default value is given by 1+(len(x)-offsetx-1)/incx or 0
// if len(x) > offsetx+1
// incx nonzero integer
// incy nonzero integer
// offsetx nonnegative integer
// offsety nonnegative integer;
//
func Copy(X, Y matrix.Matrix, opts ...linalg.Option) (err error) {
ind := linalg.GetIndexOpts(opts...)
err = check_level1_func(ind, fcopy, X, Y)
if err != nil {
return
}
if ind.Nx == 0 {
return
}
sameType := matrix.EqualTypes(X, Y)
if ! sameType {
err = errors.New("arrays not same type")
return
}
switch X.(type) {
case *matrix.ComplexMatrix:
Xa := X.(*matrix.ComplexMatrix).ComplexArray()
Ya := Y.(*matrix.ComplexMatrix).ComplexArray()
zcopy(ind.Nx, Xa[ind.OffsetX:], ind.IncX, Ya[ind.OffsetY:], ind.IncY)
case *matrix.FloatMatrix:
Xa := X.(*matrix.FloatMatrix).FloatArray()
Ya := Y.(*matrix.FloatMatrix).FloatArray()
dcopy(ind.Nx, Xa[ind.OffsetX:], ind.IncX, Ya[ind.OffsetY:], ind.IncY)
default:
err = errors.New("not implemented for parameter types", )
}
return
}
// Scales a vector by a constant (X := alpha*X).
//
// ARGUMENTS
// X float or complex matrix
// alpha number (float or complex singleton matrix). Complex alpha is only
// allowed if X is complex.
//
// OPTIONS
// n integer. If n<0, the default value of n is used.
// The default value is equal to 1+(len(x)-offset-1)/inc or 0
// if len(x) > offset+1.
// inc positive integer, default = 1
// offset nonnegative integer, default = 0
//
func Scal(X matrix.Matrix, alpha matrix.Scalar, opts ...linalg.Option) (err error) {
ind := linalg.GetIndexOpts(opts...)
err = check_level1_func(ind, fscal, X, nil)
if err != nil {
return
}
if ind.Nx == 0 {
return
}
switch X.(type) {
case *matrix.ComplexMatrix:
Xa := X.(*matrix.ComplexMatrix).ComplexArray()
cval := alpha.Complex()
zscal(ind.Nx, cval, Xa[ind.OffsetX:], ind.IncX)
case *matrix.FloatMatrix:
Xa := X.(*matrix.FloatMatrix).FloatArray()
rval := alpha.Float()
if math.IsNaN(rval) {
return errors.New("alpha not float value")
}
dscal(ind.Nx, rval, Xa[ind.OffsetX:], ind.IncX)
default:
err = errors.New("not implemented for parameter types", )
}
return
}
// Calculate Y := alpha * X + Y. Y is set to new values.
// valid options: N, inc, incx, incy, offset, offsetx, offsety
// Constant times a vector plus a vector (Y := alpha*X+Y).
//
// ARGUMENTS
// X float or complex matrix
// Y float or complex matrix. Must have the same type as X.
// alpha number (float or complex singleton matrix). Complex alpha is only
// allowed if x is complex.
//
// OPTIONS
// n integer. If n<0, the default value of n is used.
// The default value is equal to 1+(len(x)-offsetx-1)/incx
// or 0 if len(x) >= offsetx+1
// incx nonzero integer
// incy nonzero integer
// offsetx nonnegative integer
// offsety nonnegative integer;
//
func Axpy(X, Y matrix.Matrix, alpha matrix.Scalar, opts ...linalg.Option) (err error) {
ind := linalg.GetIndexOpts(opts...)
err = check_level1_func(ind, faxpy, X, Y)
if err != nil {
return
}
if ind.Nx == 0 {
return
}
sameType := matrix.EqualTypes(X, Y)
if ! sameType {
err = errors.New("arrays not same type")
return
}
switch X.(type) {
case *matrix.ComplexMatrix:
Xa := X.(*matrix.ComplexMatrix).ComplexArray()
Ya := Y.(*matrix.ComplexMatrix).ComplexArray()
aval := alpha.Complex()
if cmplx.IsNaN(aval) {
return errors.New("alpha not complex value")
}
zaxpy(ind.Nx, aval, Xa[ind.OffsetX:],
ind.IncX, Ya[ind.OffsetY:], ind.IncY)
case *matrix.FloatMatrix:
Xa := X.(*matrix.FloatMatrix).FloatArray()
Ya := Y.(*matrix.FloatMatrix).FloatArray()
aval := alpha.Float()
if math.IsNaN(aval) {
return errors.New("alpha not float value")
}
daxpy(ind.Nx, aval, Xa[ind.OffsetX:],
ind.IncX, Ya[ind.OffsetY:], ind.IncY)
default:
err = errors.New("not implemented for parameter types", )
}
return
}
// Local Variables:
// tab-width: 4
// End: