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package
v0.0.0-...-e3578a0 Latest Latest
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 Go to latest Published: Jan 18, 2016 License: MIT Imports: 13 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	ExampleConvertSnapshotFile = `` /* 630-byte string literal not displayed */

	ExampleRenderFile = `` /* 1477-byte string literal not displayed */

	ExampleBoundsFile = `` /* 602-byte string literal not displayed */

)
View Source 
const (
	// Endianness used by default when writing catalogs. Catalogs of any
	// endianness can be read.
	DefaultEndiannessFlag int32 = -1
)
View Source 
const (
	Version = uint64(2)
)

Variables

This section is empty.

Functions

func EndiannessVersionFlag 

func EndiannessVersionFlag(end binary.ByteOrder) uint64

func ReadGadgetParticlesAt 

func ReadGadgetParticlesAt(
	path string,
	order binary.ByteOrder,
	xs, vs []geom.Vec,
	ids []int64,
)

ReadGadgetParticlesAt reads a Gadget file and writes all the particles within it to the given particle buffer, ps. floatBuf and intBuf are used internally. The length of all three buffers must be equal to the number of particles in the catalog.

This call signature, and espeically the Particle type are all a consequence of soem shockingly poor early design decisions.

func ReadGrid 

func ReadGrid(fname string) ([]float64, error)

func ReadSheetHeaderAt 

func ReadSheetHeaderAt(file string, hdBuf *SheetHeader) error

ReadHeaderAt reads the header in the given file into the target Header.

func ReadSheetPositionsAt 

func ReadSheetPositionsAt(file string, xsBuf []geom.Vec) error

ReadPositionsAt reads the velocities in the given file into a buffer.

func ReadSheetVelocitiesAt 

func ReadSheetVelocitiesAt(file string, vsBuf []geom.Vec) error

ReadVelocitiesAt reads the velocities in the given file into a buffer.

func WriteBuffer 

func WriteBuffer(
	buf density.Buffer,
	cosmo CosmoInfo, render RenderInfo, loc LocationInfo,
	wr io.Writer,
)

func WriteSheet 

func WriteSheet(file string, h *SheetHeader, xs, vs []geom.Vec)

Write writes a grid of position and velocity vectors to a file, defined by the given header.

Types

type BallConfig 

type BallConfig struct {
	// Required
	X, Y, Z, Radius float64

	// Optional
	RadiusMultiplier float64
	Name             string
}

func (*BallConfig) Box 

func (ball *BallConfig) Box(totalWidth float64) *BoxConfig

func (*BallConfig) CheckInit 

func (ball *BallConfig) CheckInit(name string, totalWidth float64) error

type BoundsConfig 

type BoundsConfig struct {
	Ball map[string]*BallConfig
	Box  map[string]*BoxConfig
}

type BoxConfig 

type BoxConfig struct {
	// Required
	X, Y, Z                float64
	XWidth, YWidth, ZWidth float64

	// Optional
	ProjectionAxis string

	// Optional, "undocumented"
	Name string
}

func ReadBoundsConfig 

func ReadBoundsConfig(fname string, totalWidth float64) ([]BoxConfig, error)

func (*BoxConfig) CheckInit 

func (box *BoxConfig) CheckInit(name string, totalWidth float64) error

func (*BoxConfig) IsProjection 

func (box *BoxConfig) IsProjection() bool

type CatalogHeader 

type CatalogHeader struct {
	Cosmo CosmologyHeader

	Mass       float64 // Mass of one particle
	Count      int64   // Number of particles in catalog
	TotalCount int64   // Number of particles in all catalogs
	CountWidth int64   // Number of particles "on one side": TotalCount^(1/3)

	Idx        int64   // Index of catalog: x-major ordering is used
	GridWidth  int64   // Number of gird cells "on one side"
	Width      float64 // Width of the catalog's bounding box
	TotalWidth float64 // Width of the sim's bounding box
}

CatalogHeader describes meta-information about the current catalog.

func ReadGadget 

func ReadGadget(
	path string, order binary.ByteOrder,
) (hd *CatalogHeader, xs, vs []geom.Vec, ids []int64)

ReadGadget reads the gadget particle catalog located at the given location and written with the given endianness. Its header and particle sequence are returned in a standardized format.

func ReadGadgetHeader 

func ReadGadgetHeader(path string, order binary.ByteOrder) *CatalogHeader

ReadGadgetHeader reads a Gadget catalog and returns a standardized gotetra containing its information.

type ConvertSnapshotConfig 

type ConvertSnapshotConfig struct {
	SharedConfig
	// Required
	Cells       int
	InputFormat string

	// Optional
	IteratedInput, IteratedOutput string
	IterationStart, IterationEnd  int
}

func (*ConvertSnapshotConfig) ValidCells 

func (con *ConvertSnapshotConfig) ValidCells() bool

func (*ConvertSnapshotConfig) ValidInputFormat 

func (con *ConvertSnapshotConfig) ValidInputFormat() bool

func (*ConvertSnapshotConfig) ValidIteratedInput 

func (con *ConvertSnapshotConfig) ValidIteratedInput() bool

func (*ConvertSnapshotConfig) ValidIteratedOutput 

func (con *ConvertSnapshotConfig) ValidIteratedOutput() bool

func (*ConvertSnapshotConfig) ValidIterationEnd 

func (con *ConvertSnapshotConfig) ValidIterationEnd() bool

func (*ConvertSnapshotConfig) ValidIterationStart 

func (con *ConvertSnapshotConfig) ValidIterationStart() bool

type ConvertSnapshotWrapper 

type ConvertSnapshotWrapper struct {
	ConvertSnapshot ConvertSnapshotConfig
}

func DefaultConvertSnapshotWrapper 

func DefaultConvertSnapshotWrapper() *ConvertSnapshotWrapper

type CosmoInfo 

type CosmoInfo struct {
	Redshift, ScaleFactor  float64
	OmegaM, OmegaL, Hubble float64
	RhoMean, RhoCritical   float64
	BoxWidth               float64
}

func NewCosmoInfo 

func NewCosmoInfo(H0, omegaM, omegaL, z, boxWidth float64) CosmoInfo

type CosmologyHeader 

type CosmologyHeader struct {
	Z      float64
	OmegaM float64
	OmegaL float64
	H100   float64
}

CosmologyHeader contains information describing the cosmological context in which the simulation was run.

type GridHeader 

type GridHeader struct {
	EndiannessVersion uint64
	Type              TypeInfo
	Cosmo             CosmoInfo
	Render            RenderInfo
	Loc               LocationInfo
	Vel               LocationInfo
}

func ReadGridHeader 

func ReadGridHeader(fname string) (*GridHeader, error)

type IntVector 

type IntVector [3]int64

type LocationInfo 

type LocationInfo struct {
	Origin, Span           Vector
	PixelOrigin, PixelSpan IntVector
	PixelWidth             float64
}

func NewLocationInfo 

func NewLocationInfo(origin, span [3]int, cellWidth float64) LocationInfo

type Particle 

type Particle struct {
	Xs, Vs geom.Vec
	Id     int64
}

This is a terrible idea and shouldn't exist.

type ParticleBuffer 

type ParticleBuffer struct {
	// contains filtered or unexported fields
}

ParticleBuffer is a wrapper around catalog files which allows floats to be appended to files on the fly without much overhead from I/O or without excessive memory usage/reallocating.

func NewParticleBuffer 

func NewParticleBuffer(xs, vs []geom.Vec, bufSize int) *ParticleBuffer

NewParticleBuffer creates a ParticleBuffer associated with the given file.

func (*ParticleBuffer) Append 

func (pb *ParticleBuffer) Append(xBuf, vBuf []geom.Vec, idBuf []int64)

Append adds a value to the float buffer, which will eventually be written to the target file.

func (*ParticleBuffer) Flush 

func (pb *ParticleBuffer) Flush()

Flush writes the contents of the buffer to its target file. This will be called automatically whenever the buffer fills.

type RenderConfig 

type RenderConfig struct {
	SharedConfig

	// Required
	Quantity               string
	TotalPixels, Particles int

	// Optional
	AutoParticles                bool
	ImagePixels, ProjectionDepth int
	SubsampleLength              int
	AppendName, PrependName      string
}

func (*RenderConfig) ValidImagePixels 

func (con *RenderConfig) ValidImagePixels() bool

func (*RenderConfig) ValidParticles 

func (con *RenderConfig) ValidParticles() bool

func (*RenderConfig) ValidProjectionDepth 

func (con *RenderConfig) ValidProjectionDepth() bool

func (*RenderConfig) ValidQuantity 

func (b *RenderConfig) ValidQuantity() bool

func (*RenderConfig) ValidSubsampleLength 

func (con *RenderConfig) ValidSubsampleLength() bool

func (*RenderConfig) ValidTotalPixels 

func (con *RenderConfig) ValidTotalPixels() bool

type RenderInfo 

type RenderInfo struct {
	Particles          int64
	TotalPixels        int64
	SubsampleLength    int64
	MinProjectionDepth int64
	ProjectionAxis     int64
}

func NewRenderInfo 

func NewRenderInfo(particles, totalCells, skip int, axisStr string) RenderInfo

type RenderWrapper 

type RenderWrapper struct {
	Render RenderConfig
}

func DefaultRenderWrapper 

func DefaultRenderWrapper() *RenderWrapper

type SharedConfig 

type SharedConfig struct {
	// Required
	Input, Output string
	// Optional
	LogFile, ProfileFile string
}

func (*SharedConfig) ValidInput 

func (con *SharedConfig) ValidInput() bool

func (*SharedConfig) ValidLogFile 

func (con *SharedConfig) ValidLogFile() bool

func (*SharedConfig) ValidOutput 

func (con *SharedConfig) ValidOutput() bool

func (*SharedConfig) ValidProfileFile 

func (con *SharedConfig) ValidProfileFile() bool

type SheetHeader 

type SheetHeader struct {
	Cosmo                              CosmologyHeader
	Count, CountWidth                  int64
	SegmentWidth, GridWidth, GridCount int64 // GridWidth = SegmentWidth + 1
	Idx, Cells                         int64

	Mass       float64
	TotalWidth float64

	Origin, Width                 geom.Vec
	VelocityOrigin, VelocityWidth geom.Vec
}

The binary format used for phase sheets is as follows: 

|-- 1 --||-- 2 --||-- ... 3 ... --||-- ... 4 ... --||-- ... 5 ... --|

1 - (int32) Flag indicating the endianness of the file. 0 indicates a big
    endian byte ordering and -1 indicates a little endian byte order.
2 - (int32) Size of a Header struct. Should be checked for consistency.
3 - (sheet.Header) Header file containing meta-information about the
    sheet fragment.
4 - ([][3]float32) Contiguous block of x, y, z coordinates. Given in Mpc.
5 - ([][3]float32) Contiguous block of v_x, v_y, v_z coordinates.

func (*SheetHeader) CellBounds 

func (hd *SheetHeader) CellBounds(cells int) *geom.CellBounds

type TypeInfo 

type TypeInfo struct {
	HeaderSize   int64
	GridType     int64
	IsVectorGrid int64
}

type Vector 

type Vector [3]float64

Source Files

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