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// Copyright ©2015 The Gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package blas64
import "gonum.org/v1/gonum/blas"
// SymmetricCols represents a matrix using the conventional column-major storage scheme.
type SymmetricCols Symmetric
// From fills the receiver with elements from a. The receiver
// must have the same dimensions and uplo as a and have adequate
// backing data storage.
func (t SymmetricCols) From(a Symmetric) {
if t.N != a.N {
panic("blas64: mismatched dimension")
}
if t.Uplo != a.Uplo {
panic("blas64: mismatched BLAS uplo")
}
switch a.Uplo {
default:
panic("blas64: bad BLAS uplo")
case blas.Upper:
for i := 0; i < a.N; i++ {
for j := i; j < a.N; j++ {
t.Data[i+j*t.Stride] = a.Data[i*a.Stride+j]
}
}
case blas.Lower:
for i := 0; i < a.N; i++ {
for j := 0; j <= i; j++ {
t.Data[i+j*t.Stride] = a.Data[i*a.Stride+j]
}
}
}
}
// From fills the receiver with elements from a. The receiver
// must have the same dimensions and uplo as a and have adequate
// backing data storage.
func (t Symmetric) From(a SymmetricCols) {
if t.N != a.N {
panic("blas64: mismatched dimension")
}
if t.Uplo != a.Uplo {
panic("blas64: mismatched BLAS uplo")
}
switch a.Uplo {
default:
panic("blas64: bad BLAS uplo")
case blas.Upper:
for i := 0; i < a.N; i++ {
for j := i; j < a.N; j++ {
t.Data[i*t.Stride+j] = a.Data[i+j*a.Stride]
}
}
case blas.Lower:
for i := 0; i < a.N; i++ {
for j := 0; j <= i; j++ {
t.Data[i*t.Stride+j] = a.Data[i+j*a.Stride]
}
}
}
}
// SymmetricBandCols represents a symmetric matrix using the band column-major storage scheme.
type SymmetricBandCols SymmetricBand
// From fills the receiver with elements from a. The receiver
// must have the same dimensions, bandwidth and uplo as a and
// have adequate backing data storage.
func (t SymmetricBandCols) From(a SymmetricBand) {
if t.N != a.N {
panic("blas64: mismatched dimension")
}
if t.K != a.K {
panic("blas64: mismatched bandwidth")
}
if a.Stride < a.K+1 {
panic("blas64: short stride for source")
}
if t.Stride < t.K+1 {
panic("blas64: short stride for destination")
}
if t.Uplo != a.Uplo {
panic("blas64: mismatched BLAS uplo")
}
dst := BandCols{
Rows: t.N, Cols: t.N,
Stride: t.Stride,
Data: t.Data,
}
src := Band{
Rows: a.N, Cols: a.N,
Stride: a.Stride,
Data: a.Data,
}
switch a.Uplo {
default:
panic("blas64: bad BLAS uplo")
case blas.Upper:
dst.KU = t.K
src.KU = a.K
case blas.Lower:
dst.KL = t.K
src.KL = a.K
}
dst.From(src)
}
// From fills the receiver with elements from a. The receiver
// must have the same dimensions, bandwidth and uplo as a and
// have adequate backing data storage.
func (t SymmetricBand) From(a SymmetricBandCols) {
if t.N != a.N {
panic("blas64: mismatched dimension")
}
if t.K != a.K {
panic("blas64: mismatched bandwidth")
}
if a.Stride < a.K+1 {
panic("blas64: short stride for source")
}
if t.Stride < t.K+1 {
panic("blas64: short stride for destination")
}
if t.Uplo != a.Uplo {
panic("blas64: mismatched BLAS uplo")
}
dst := Band{
Rows: t.N, Cols: t.N,
Stride: t.Stride,
Data: t.Data,
}
src := BandCols{
Rows: a.N, Cols: a.N,
Stride: a.Stride,
Data: a.Data,
}
switch a.Uplo {
default:
panic("blas64: bad BLAS uplo")
case blas.Upper:
dst.KU = t.K
src.KU = a.K
case blas.Lower:
dst.KL = t.K
src.KL = a.K
}
dst.From(src)
}
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