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magnetization.go
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magnetization.go
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package engine
import (
"github.com/mumax/3/cuda"
"github.com/mumax/3/data"
"github.com/mumax/3/util"
"reflect"
)
var M magnetization // reduced magnetization (unit length)
func init() { DeclLValue("m", &M, `Reduced magnetization (unit length)`) }
// Special buffered quantity to store magnetization
// makes sure it's normalized etc.
type magnetization struct {
buffer_ *data.Slice
}
func (m *magnetization) Mesh() *data.Mesh { return Mesh() }
func (m *magnetization) NComp() int { return 3 }
func (m *magnetization) Name() string { return "m" }
func (m *magnetization) Unit() string { return "" }
func (m *magnetization) Buffer() *data.Slice { return m.buffer_ } // todo: rename Gpu()?
func (m *magnetization) Comp(c int) *comp { return Comp(m, c) }
func (m *magnetization) SetValue(v interface{}) { m.SetInShape(nil, v.(Config)) }
func (m *magnetization) InputType() reflect.Type { return reflect.TypeOf(Config(nil)) }
func (m *magnetization) Type() reflect.Type { return reflect.TypeOf(new(magnetization)) }
func (m *magnetization) Eval() interface{} { return m }
func (m *magnetization) average() []float64 { return sAverageMagnet(M.Buffer()) }
func (m *magnetization) Average() data.Vector { return unslice(m.average()) }
func (m *magnetization) normalize() { cuda.Normalize(M.Buffer(), geometry.Gpu()) }
// allocate storage (not done by init, as mesh size may not yet be known then)
func (m *magnetization) alloc() {
m.buffer_ = cuda.NewSlice(3, m.Mesh().Size())
m.Set(RandomMag()) // sane starting config
}
func (b *magnetization) SetArray(src *data.Slice) {
if src.Size() != b.Mesh().Size() {
src = data.Resample(src, b.Mesh().Size())
}
data.Copy(b.Buffer(), src)
M.normalize()
}
func (m *magnetization) Set(c Config) {
checkMesh()
m.SetInShape(nil, c)
}
func (m *magnetization) LoadFile(fname string) {
m.SetArray(LoadFile(fname))
}
func (m *magnetization) Slice() (s *data.Slice, recycle bool) {
return m.Buffer(), false
}
func (m *magnetization) Region(r int) *vOneReg { return vOneRegion(m, r) }
func (m *magnetization) String() string { return util.Sprint(m.Buffer().HostCopy()) }
// Set the value of one cell.
func (m *magnetization) SetCell(ix, iy, iz int, v data.Vector) {
for c := 0; c < 3; c++ {
cuda.SetCell(m.Buffer(), c, ix, iy, iz, float32(v[c]))
}
}
// Get the value of one cell.
func (m *magnetization) GetCell(ix, iy, iz int) data.Vector {
mx := float64(cuda.GetCell(m.Buffer(), X, ix, iy, iz))
my := float64(cuda.GetCell(m.Buffer(), Y, ix, iy, iz))
mz := float64(cuda.GetCell(m.Buffer(), Z, ix, iy, iz))
return Vector(mx, my, mz)
}
func (m *magnetization) TableData() []float64 { return slice(m.Average()) }
// Sets the magnetization inside the shape
func (m *magnetization) SetInShape(region Shape, conf Config) {
checkMesh()
if region == nil {
region = universe
}
host := m.Buffer().HostCopy()
h := host.Vectors()
n := m.Mesh().Size()
for iz := 0; iz < n[Z]; iz++ {
for iy := 0; iy < n[Y]; iy++ {
for ix := 0; ix < n[X]; ix++ {
r := Index2Coord(ix, iy, iz)
x, y, z := r[X], r[Y], r[Z]
if region(x, y, z) { // inside
m := conf(x, y, z)
h[X][iz][iy][ix] = float32(m[X])
h[Y][iz][iy][ix] = float32(m[Y])
h[Z][iz][iy][ix] = float32(m[Z])
}
}
}
}
m.SetArray(host)
}
// set m to config in region
func (m *magnetization) SetRegion(region int, conf Config) {
host := m.Buffer().HostCopy()
h := host.Vectors()
n := m.Mesh().Size()
r := byte(region)
regionsArr := regions.HostArray()
for iz := 0; iz < n[Z]; iz++ {
for iy := 0; iy < n[Y]; iy++ {
for ix := 0; ix < n[X]; ix++ {
pos := Index2Coord(ix, iy, iz)
x, y, z := pos[X], pos[Y], pos[Z]
if regionsArr[iz][iy][ix] == r {
m := conf(x, y, z)
h[X][iz][iy][ix] = float32(m[X])
h[Y][iz][iy][ix] = float32(m[Y])
h[Z][iz][iy][ix] = float32(m[Z])
}
}
}
}
m.SetArray(host)
}
func (m *magnetization) resize() {
backup := m.Buffer().HostCopy()
s2 := Mesh().Size()
resized := data.Resample(backup, s2)
m.buffer_.Free()
m.buffer_ = cuda.NewSlice(VECTOR, s2)
data.Copy(m.buffer_, resized)
}