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LSST Data Management Base Package
Public Member Functions | Static Public Member Functions | Protected Types | Protected Member Functions | Protected Attributes | List of all members
lsst::afw::math::GaussianFunction2< ReturnT > Class Template Reference

2-dimensional Gaussian More...

#include <FunctionLibrary.h>

Inheritance diagram for lsst::afw::math::GaussianFunction2< ReturnT >:
lsst::afw::math::Function2< ReturnT > lsst::afw::table::io::PersistableFacade< Function2< ReturnT > > lsst::afw::math::Function< ReturnT > lsst::afw::table::io::PersistableFacade< Function< ReturnT > > lsst::afw::table::io::Persistable

Public Member Functions

 GaussianFunction2 (double sigma1, double sigma2, double angle=0.0)
 Construct a 2-dimensional Gaussian function. More...
 
 GaussianFunction2 (GaussianFunction2 const &)=default
 
 GaussianFunction2 (GaussianFunction2 &&)=default
 
GaussianFunction2operator= (GaussianFunction2 const &)=default
 
GaussianFunction2operator= (GaussianFunction2 &&)=default
 
 ~GaussianFunction2 () noexcept override=default
 
std::shared_ptr< Function2< ReturnT > > clone () const override
 Return a pointer to a deep copy of this function. More...
 
ReturnT operator() (double x, double y) const noexcept(IS_NOTHROW_INIT< ReturnT >) override
 
std::string toString (std::string const &prefix) const override
 Return a string representation of the function. More...
 
bool isPersistable () const noexcept override
 Return true if this particular object can be persisted using afw::table::io. More...
 
virtual std::vector< double > getDFuncDParameters (double, double) const
 Return the derivative of the Function with respect to its parameters. More...
 
unsigned int getNParameters () const noexcept
 Return the number of function parameters. More...
 
virtual double getParameter (unsigned int ind) const
 Get one function parameter without range checking. More...
 
std::vector< double > const & getParameters () const noexcept
 Return all function parameters. More...
 
virtual bool isLinearCombination () const noexcept
 Is the function a linear combination of its parameters? More...
 
void setParameter (unsigned int ind, double newValue)
 Set one function parameter without range checking. More...
 
void setParameters (std::vector< double > const &params)
 Set all function parameters. More...
 
void writeFits (std::string const &fileName, std::string const &mode="w") const
 Write the object to a regular FITS file. More...
 
void writeFits (fits::MemFileManager &manager, std::string const &mode="w") const
 Write the object to a FITS image in memory. More...
 
void writeFits (fits::Fits &fitsfile) const
 Write the object to an already-open FITS object. More...
 

Static Public Member Functions

static std::shared_ptr< Function2< ReturnT > > readFits (fits::Fits &fitsfile)
 Read an object from an already open FITS object. More...
 
static std::shared_ptr< Function2< ReturnT > > readFits (std::string const &fileName, int hdu=fits::DEFAULT_HDU)
 Read an object from a regular FITS file. More...
 
static std::shared_ptr< Function2< ReturnT > > readFits (fits::MemFileManager &manager, int hdu=fits::DEFAULT_HDU)
 Read an object from a FITS file in memory. More...
 
static std::shared_ptr< Function< ReturnT > > readFits (fits::Fits &fitsfile)
 Read an object from an already open FITS object. More...
 
static std::shared_ptr< Function< ReturnT > > readFits (std::string const &fileName, int hdu=fits::DEFAULT_HDU)
 Read an object from a regular FITS file. More...
 
static std::shared_ptr< Function< ReturnT > > readFits (fits::MemFileManager &manager, int hdu=fits::DEFAULT_HDU)
 Read an object from a FITS file in memory. More...
 
static std::shared_ptr< Function2< ReturnT > > dynamicCast (std::shared_ptr< Persistable > const &ptr)
 Dynamically cast a shared_ptr. More...
 
static std::shared_ptr< Function< ReturnT > > dynamicCast (std::shared_ptr< Persistable > const &ptr)
 Dynamically cast a shared_ptr. More...
 

Protected Types

using OutputArchiveHandle = io::OutputArchiveHandle
 

Protected Member Functions

std::string getPersistenceName () const override
 Return the unique name used to persist this object and look up its factory. More...
 
void write (afw::table::io::OutputArchiveHandle &handle) const override
 Write the object to one or more catalogs. More...
 
 GaussianFunction2 ()
 
std::string getPythonModule () const override
 Return the fully-qualified Python module that should be imported to guarantee that its factory is registered. More...
 

Protected Attributes

std::vector< double > _params
 
bool _isCacheValid
 

Detailed Description

template<typename ReturnT>
class lsst::afw::math::GaussianFunction2< ReturnT >

2-dimensional Gaussian

f(x,y) = A e^((-pos1^2 / 2 sigma1^2) - (pos2^2 / 2 sigma2^2)) where:

Note
if sigma1 > sigma2 then angle is the angle of the major axis

Definition at line 201 of file FunctionLibrary.h.

Member Typedef Documentation

◆ OutputArchiveHandle

using lsst::afw::table::io::Persistable::OutputArchiveHandle = io::OutputArchiveHandle
protectedinherited

Definition at line 108 of file Persistable.h.

Constructor & Destructor Documentation

◆ GaussianFunction2() [1/4]

template<typename ReturnT >
lsst::afw::math::GaussianFunction2< ReturnT >::GaussianFunction2 ( double  sigma1,
double  sigma2,
double  angle = 0.0 
)
inlineexplicit

Construct a 2-dimensional Gaussian function.

Parameters
sigma1sigma along the pos1 axis
sigma2sigma along the pos2 axis
angleangle of pos1 axis, in rad (along x=0, y=pi/2)

Definition at line 206 of file FunctionLibrary.h.

209  : Function2<ReturnT>(3), _multFac(1.0 / (lsst::geom::TWOPI)) {
210  this->_params[0] = sigma1;
211  this->_params[1] = sigma2;
212  this->_params[2] = angle;
213  _updateCache();
214  }
table::Key< double > angle
table::Key< double > sigma2
table::Key< double > sigma1
std::vector< double > _params
Definition: Function.h:185
constexpr double TWOPI
Definition: Angle.h:40

◆ GaussianFunction2() [2/4]

template<typename ReturnT >
lsst::afw::math::GaussianFunction2< ReturnT >::GaussianFunction2 ( GaussianFunction2< ReturnT > const &  )
default

◆ GaussianFunction2() [3/4]

template<typename ReturnT >
lsst::afw::math::GaussianFunction2< ReturnT >::GaussianFunction2 ( GaussianFunction2< ReturnT > &&  )
default

◆ ~GaussianFunction2()

template<typename ReturnT >
lsst::afw::math::GaussianFunction2< ReturnT >::~GaussianFunction2 ( )
overridedefaultnoexcept

◆ GaussianFunction2() [4/4]

template<typename ReturnT >
lsst::afw::math::GaussianFunction2< ReturnT >::GaussianFunction2 ( )
inlineexplicitprotected

Definition at line 282 of file FunctionLibrary.h.

283  : Function2<ReturnT>(3),
284  _multFac(1.0 / (lsst::geom::TWOPI)),
285  _angle(0.0),
286  _sinAngle(0.0),
287  _cosAngle(1.0) {}

Member Function Documentation

◆ clone()

template<typename ReturnT >
std::shared_ptr<Function2<ReturnT> > lsst::afw::math::GaussianFunction2< ReturnT >::clone ( ) const
inlineoverridevirtual

Return a pointer to a deep copy of this function.

This function exists instead of a copy constructor so one can obtain a copy of an actual function instead of a useless copy of the base class.

Every non-virtual function must override this method.

Returns
a pointer to a deep copy of the function

Implements lsst::afw::math::Function2< ReturnT >.

Definition at line 222 of file FunctionLibrary.h.

222  {
224  new GaussianFunction2(this->_params[0], this->_params[1], this->_params[2]));
225  }

◆ dynamicCast() [1/2]

template std::shared_ptr< meas::extensions::psfex::PsfexPsf > lsst::afw::table::io::PersistableFacade< Function2< ReturnT > >::dynamicCast ( std::shared_ptr< Persistable > const &  ptr)
staticinherited

Dynamically cast a shared_ptr.

Dynamically cast a shared pointer and raise on failure.

You must provide an explicit template instantiation in the .cc file for each class that inherits from PersistableFacade. Designed to work around RTTI issues on macOS with hidden symbols;

Exceptions
lsst::pex::exceptions::LogicErrorif the cast fails

param[in] ptr The pointer to be cast.

Returns
The cast pointer.
Exceptions
lsst::pex::exceptions::TypeErrorIf the dynamic cast fails.

Definition at line 218 of file Persistable.cc.

18  {
19  auto result = std::dynamic_pointer_cast<T>(ptr);
20  if (!result) {
21  throw LSST_EXCEPT(pex::exceptions::TypeError, "Dynamic pointer cast failed");
22  }
23  return result;
24 }
py::object result
Definition: _schema.cc:429
#define LSST_EXCEPT(type,...)
Create an exception with a given type.
Definition: Exception.h:48
uint64_t * ptr
Definition: RangeSet.cc:88

◆ dynamicCast() [2/2]

template std::shared_ptr< meas::extensions::psfex::PsfexPsf > lsst::afw::table::io::PersistableFacade< Function< ReturnT > >::dynamicCast ( std::shared_ptr< Persistable > const &  ptr)
staticinherited

Dynamically cast a shared_ptr.

Dynamically cast a shared pointer and raise on failure.

You must provide an explicit template instantiation in the .cc file for each class that inherits from PersistableFacade. Designed to work around RTTI issues on macOS with hidden symbols;

Exceptions
lsst::pex::exceptions::LogicErrorif the cast fails

param[in] ptr The pointer to be cast.

Returns
The cast pointer.
Exceptions
lsst::pex::exceptions::TypeErrorIf the dynamic cast fails.

Definition at line 218 of file Persistable.cc.

18  {
19  auto result = std::dynamic_pointer_cast<T>(ptr);
20  if (!result) {
21  throw LSST_EXCEPT(pex::exceptions::TypeError, "Dynamic pointer cast failed");
22  }
23  return result;
24 }

◆ getDFuncDParameters()

template<typename ReturnT >
virtual std::vector<double> lsst::afw::math::Function2< ReturnT >::getDFuncDParameters ( double  ,
double   
) const
inlinevirtualinherited

Return the derivative of the Function with respect to its parameters.

Reimplemented in lsst::afw::math::PolynomialFunction2< ReturnT >, and lsst::afw::math::BasePolynomialFunction2< ReturnT >.

Definition at line 305 of file Function.h.

305  {
307  "getDFuncDParameters is not implemented for this class");
308  }
Reports attempts to access elements using an invalid key.
Definition: Runtime.h:151

◆ getNParameters()

template<typename ReturnT >
unsigned int lsst::afw::math::Function< ReturnT >::getNParameters ( ) const
inlinenoexceptinherited

Return the number of function parameters.

Returns
the number of function parameters

Definition at line 112 of file Function.h.

112 { return _params.size(); }
T size(T... args)

◆ getParameter()

template<typename ReturnT >
virtual double lsst::afw::math::Function< ReturnT >::getParameter ( unsigned int  ind) const
inlinevirtualinherited

Get one function parameter without range checking.

Returns
the specified function parameter
Parameters
indindex of parameter

Definition at line 119 of file Function.h.

120  {
121  return _params[ind];
122  }

◆ getParameters()

template<typename ReturnT >
std::vector<double> const& lsst::afw::math::Function< ReturnT >::getParameters ( ) const
inlinenoexceptinherited

Return all function parameters.

Returns
the function parameters as a vector

Definition at line 129 of file Function.h.

129 { return _params; }

◆ getPersistenceName()

template<typename ReturnT >
std::string lsst::afw::math::GaussianFunction2< ReturnT >::getPersistenceName
overrideprotectedvirtual

Return the unique name used to persist this object and look up its factory.

Must be less than ArchiveIndexSchema::MAX_NAME_LENGTH characters.

Reimplemented from lsst::afw::table::io::Persistable.

Definition at line 197 of file FunctionLibrary.cc.

197  {
198  return "GaussianFunction2" + Suffix<ReturnT>::get();
199 }

◆ getPythonModule()

template<typename ReturnT >
std::string lsst::afw::math::Function< ReturnT >::getPythonModule ( ) const
inlineoverrideprotectedvirtualinherited

Return the fully-qualified Python module that should be imported to guarantee that its factory is registered.

Must be less than ArchiveIndexSchema::MAX_MODULE_LENGTH characters.

Will be ignored if empty.

Reimplemented from lsst::afw::table::io::Persistable.

Definition at line 188 of file Function.h.

188 { return "lsst.afw.math"; }

◆ isLinearCombination()

template<typename ReturnT >
virtual bool lsst::afw::math::Function< ReturnT >::isLinearCombination ( ) const
inlinevirtualnoexceptinherited

Is the function a linear combination of its parameters?

Returns
true if the function can be expressed as: sum over i of parameter_i * function_i(args)
Warning
: subclasses must override if true.

Reimplemented in lsst::afw::math::Chebyshev1Function1< ReturnT >, lsst::afw::math::PolynomialFunction1< ReturnT >, and lsst::afw::math::BasePolynomialFunction2< ReturnT >.

Definition at line 138 of file Function.h.

138 { return false; }

◆ isPersistable()

template<typename ReturnT >
bool lsst::afw::math::GaussianFunction2< ReturnT >::isPersistable ( ) const
inlineoverridevirtualnoexcept

Return true if this particular object can be persisted using afw::table::io.

Reimplemented from lsst::afw::table::io::Persistable.

Definition at line 245 of file FunctionLibrary.h.

245 { return true; }

◆ operator()()

template<typename ReturnT >
ReturnT lsst::afw::math::GaussianFunction2< ReturnT >::operator() ( double  x,
double  y 
) const
inlineoverridevirtualnoexcept

Implements lsst::afw::math::Function2< ReturnT >.

Definition at line 227 of file FunctionLibrary.h.

227  {
228  if (_angle != this->_params[2]) {
229  _updateCache();
230  }
231  double pos1 = (_cosAngle * x) + (_sinAngle * y);
232  double pos2 = (-_sinAngle * x) + (_cosAngle * y);
233  return static_cast<ReturnT>((_multFac / (this->_params[0] * this->_params[1])) *
234  std::exp(-((pos1 * pos1) / (2.0 * this->_params[0] * this->_params[0])) -
235  ((pos2 * pos2) / (2.0 * this->_params[1] * this->_params[1]))));
236  }
double x
int y
Definition: SpanSet.cc:48
T exp(T... args)

◆ operator=() [1/2]

template<typename ReturnT >
GaussianFunction2& lsst::afw::math::GaussianFunction2< ReturnT >::operator= ( GaussianFunction2< ReturnT > &&  )
default

◆ operator=() [2/2]

template<typename ReturnT >
GaussianFunction2& lsst::afw::math::GaussianFunction2< ReturnT >::operator= ( GaussianFunction2< ReturnT > const &  )
default

◆ readFits() [1/6]

static std::shared_ptr<Function2< ReturnT > > lsst::afw::table::io::PersistableFacade< Function2< ReturnT > >::readFits ( fits::Fits fitsfile)
inlinestaticinherited

Read an object from an already open FITS object.

Parameters
[in]fitsfileFITS object to read from, already positioned at the desired HDU.

Definition at line 183 of file Persistable.h.

183  {
184  return dynamicCast(Persistable::_readFits(fitsfile));
185  }
static std::shared_ptr< Function2< ReturnT > > dynamicCast(std::shared_ptr< Persistable > const &ptr)
Dynamically cast a shared_ptr.
Definition: Persistable.cc:18

◆ readFits() [2/6]

static std::shared_ptr<Function< ReturnT > > lsst::afw::table::io::PersistableFacade< Function< ReturnT > >::readFits ( fits::Fits fitsfile)
inlinestaticinherited

Read an object from an already open FITS object.

Parameters
[in]fitsfileFITS object to read from, already positioned at the desired HDU.

Definition at line 183 of file Persistable.h.

183  {
184  return dynamicCast(Persistable::_readFits(fitsfile));
185  }

◆ readFits() [3/6]

static std::shared_ptr<Function2< ReturnT > > lsst::afw::table::io::PersistableFacade< Function2< ReturnT > >::readFits ( fits::MemFileManager manager,
int  hdu = fits::DEFAULT_HDU 
)
inlinestaticinherited

Read an object from a FITS file in memory.

Parameters
[in]managerManager for the memory to read from.
[in]hduHDU to read, where 0 is the primary. The special value of afw::fits::DEFAULT_HDU skips the primary HDU if it is empty.

Definition at line 205 of file Persistable.h.

205  {
206  return dynamicCast(Persistable::_readFits(manager, hdu));
207  }

◆ readFits() [4/6]

static std::shared_ptr<Function< ReturnT > > lsst::afw::table::io::PersistableFacade< Function< ReturnT > >::readFits ( fits::MemFileManager manager,
int  hdu = fits::DEFAULT_HDU 
)
inlinestaticinherited

Read an object from a FITS file in memory.

Parameters
[in]managerManager for the memory to read from.
[in]hduHDU to read, where 0 is the primary. The special value of afw::fits::DEFAULT_HDU skips the primary HDU if it is empty.

Definition at line 205 of file Persistable.h.

205  {
206  return dynamicCast(Persistable::_readFits(manager, hdu));
207  }

◆ readFits() [5/6]

static std::shared_ptr<Function< ReturnT > > lsst::afw::table::io::PersistableFacade< Function< ReturnT > >::readFits ( std::string const &  fileName,
int  hdu = fits::DEFAULT_HDU 
)
inlinestaticinherited

Read an object from a regular FITS file.

Parameters
[in]fileNameName of the file to read.
[in]hduHDU to read, where 0 is the primary. The special value of afw::fits::DEFAULT_HDU skips the primary HDU if it is empty.

Definition at line 194 of file Persistable.h.

194  {
195  return dynamicCast(Persistable::_readFits(fileName, hdu));
196  }

◆ readFits() [6/6]

static std::shared_ptr<Function2< ReturnT > > lsst::afw::table::io::PersistableFacade< Function2< ReturnT > >::readFits ( std::string const &  fileName,
int  hdu = fits::DEFAULT_HDU 
)
inlinestaticinherited

Read an object from a regular FITS file.

Parameters
[in]fileNameName of the file to read.
[in]hduHDU to read, where 0 is the primary. The special value of afw::fits::DEFAULT_HDU skips the primary HDU if it is empty.

Definition at line 194 of file Persistable.h.

194  {
195  return dynamicCast(Persistable::_readFits(fileName, hdu));
196  }

◆ setParameter()

template<typename ReturnT >
void lsst::afw::math::Function< ReturnT >::setParameter ( unsigned int  ind,
double  newValue 
)
inlineinherited

Set one function parameter without range checking.

Parameters
indindex of parameter
newValuenew value for parameter

Definition at line 143 of file Function.h.

145  {
146  _isCacheValid = false;
147  _params[ind] = newValue;
148  }

◆ setParameters()

template<typename ReturnT >
void lsst::afw::math::Function< ReturnT >::setParameters ( std::vector< double > const &  params)
inlineinherited

Set all function parameters.

Exceptions
lsst::pex::exceptions::InvalidParameterErrorif the wrong number of parameters is supplied.
Parameters
paramsvector of function parameters

Definition at line 156 of file Function.h.

157  {
158  if (_params.size() != params.size()) {
159  throw LSST_EXCEPT(
161  (boost::format("params has %d entries instead of %d") % params.size() % _params.size())
162  .str());
163  }
164  _isCacheValid = false;
165  _params = params;
166  }
Reports invalid arguments.
Definition: Runtime.h:66
def format(config, name=None, writeSourceLine=True, prefix="", verbose=False)
Definition: history.py:174

◆ toString()

template<typename ReturnT >
std::string lsst::afw::math::GaussianFunction2< ReturnT >::toString ( std::string const &  ) const
inlineoverridevirtual

Return a string representation of the function.

Returns
a string representation of the function

Reimplemented from lsst::afw::math::Function2< ReturnT >.

Definition at line 238 of file FunctionLibrary.h.

238  {
240  os << "GaussianFunction2: ";
241  os << Function2<ReturnT>::toString(prefix);
242  return os.str();
243  }
std::ostream * os
Definition: Schema.cc:557
std::string prefix
Definition: SchemaMapper.cc:72

◆ write()

template<typename ReturnT >
void lsst::afw::math::GaussianFunction2< ReturnT >::write ( afw::table::io::OutputArchiveHandle handle) const
overrideprotectedvirtual

Write the object to one or more catalogs.

The handle object passed to this function provides an interface for adding new catalogs and adding nested objects to the same archive (while checking for duplicates). See OutputArchiveHandle for more information.

Reimplemented from lsst::afw::table::io::Persistable.

Definition at line 217 of file FunctionLibrary.cc.

217  {
218  GaussianFunction2PersistenceHelper const& keys = GaussianFunction2PersistenceHelper::get();
219  table::BaseCatalog catalog = handle.makeCatalog(keys.schema);
220  std::shared_ptr<table::BaseRecord> record = catalog.addNew();
221  record->set(keys.sigma1, this->getParameters()[0]);
222  record->set(keys.sigma2, this->getParameters()[1]);
223  record->set(keys.angle, this->getParameters()[2]);
224  handle.saveCatalog(catalog);
225 }
CatalogT< BaseRecord > BaseCatalog
Definition: fwd.h:72

◆ writeFits() [1/3]

void lsst::afw::table::io::Persistable::writeFits ( fits::Fits fitsfile) const
inherited

Write the object to an already-open FITS object.

Parameters
[in]fitsfileOpen FITS object to write to.

Definition at line 18 of file Persistable.cc.

18  {
19  OutputArchive archive;
20  archive.put(this);
21  archive.writeFits(fitsfile);
22 }

◆ writeFits() [2/3]

void lsst::afw::table::io::Persistable::writeFits ( fits::MemFileManager manager,
std::string const &  mode = "w" 
) const
inherited

Write the object to a FITS image in memory.

Parameters
[in]managerName of the file to write to.
[in]modeIf "w", any existing file with the given name will be overwritten. If "a", new HDUs will be appended to an existing file.

Definition at line 29 of file Persistable.cc.

29  {
30  fits::Fits fitsfile(manager, mode, fits::Fits::AUTO_CLOSE | fits::Fits::AUTO_CHECK);
31  writeFits(fitsfile);
32 }
void writeFits(std::string const &fileName, std::string const &mode="w") const
Write the object to a regular FITS file.
Definition: Persistable.cc:24

◆ writeFits() [3/3]

void lsst::afw::table::io::Persistable::writeFits ( std::string const &  fileName,
std::string const &  mode = "w" 
) const
inherited

Write the object to a regular FITS file.

Parameters
[in]fileNameName of the file to write to.
[in]modeIf "w", any existing file with the given name will be overwritten. If "a", new HDUs will be appended to an existing file.

Definition at line 24 of file Persistable.cc.

24  {
25  fits::Fits fitsfile(fileName, mode, fits::Fits::AUTO_CLOSE | fits::Fits::AUTO_CHECK);
26  writeFits(fitsfile);
27 }

Member Data Documentation

◆ _isCacheValid

template<typename ReturnT >
bool lsst::afw::math::Function< ReturnT >::_isCacheValid
mutableprotectedinherited

Definition at line 186 of file Function.h.

◆ _params

template<typename ReturnT >
std::vector<double> lsst::afw::math::Function< ReturnT >::_params
protectedinherited

Definition at line 185 of file Function.h.


The documentation for this class was generated from the following files: