model_image_xsringauss Class Reference
Defines an interface for a Geometric Slashed Ring Model based on the model_image class. This is a simple example of a model_image object. More...
#include "model/model_image_xsringauss.h"
Inheritance diagram for model_image_xsringauss:
Collaboration diagram for model_image_xsringauss:
Public Member Functions | |
| void | use_numerical_visibilities () |
| State switch to select numerically computed visibilities using the machinery in model_image. Once called, all future visibilities will be computed numerically until use_analytical_visibilities() is called. | |
| void | set_image_resolution (int Nray) |
| Sets model_image_crescent to generate production images with resolution Nray x Nray. The default is 128x128, which is probably larger than required in practice. | |
| void | use_analytical_visibilities () |
| State switch to select analytically computed visibilities using the analytical Fourier transform of the Gaussian. Once called, visibilities will be computed analytically until use_numerical_visibilities() is called. | |
| virtual size_t | size () const |
| A user-supplied function that returns the number of the parameters the model expects. | |
| virtual std::string | model_tag () const |
| Return a string that contains a unique identifying tag for use with the ThemisPy plotting features. | |
| virtual std::complex< double > | visibility (datum_visibility &d, double accuracy) |
| Returns complex visibility in Jy computed from the image given a datum_visibility_amplitude object, containing all of the accoutrements. While this provides access to the actual data value, the two could be separated if necessary. Also takes an accuracy parameter with the same units as the data, indicating the accuracy with which the model must generate a comparison value. Note that this can be redefined in child classes. | |
| virtual double | visibility_amplitude (datum_visibility_amplitude &d, double acc) |
| Returns visibility ampitudes in Jy computed from the image given a datum_visibility_amplitude object, containing all of the accoutrements. While this provides access to the actual data value, the two could be separated if necessary. Also takes an accuracy parameter with the same units as the data, indicating the accuracy with which the model must generate a comparison value. Note that this is redefined to accomodate the possibility of using the analytical computation. | |
| virtual double | closure_phase (datum_closure_phase &d, double acc) |
| Returns closure phase in degrees computed from the image given a datum_closure_phase object, containing all of the accoutrements. While this provides access to the actual data value, the two could be separated if necessary. Also takes an accuracy parameter with the same units as the data, indicating the accuracy with which the model must generate a comparison value. Note that this is redefined since the closure phase of Gaussian images is identically zero. | |
| virtual double | closure_amplitude (datum_closure_amplitude &d, double acc) |
| Returns closure amplitude computed from the image given a datum_closure_phase object, containing all of the accoutrements. While this provides access to the actual data value, the two could be separated if necessary. Also takes an accuracy parameter with the same units as the data, indicating the accuracy with which the model must generate a comparison value. Note that this can be redefined in child classes. | |
 Public Member Functions inherited from model_image | |
| virtual void | generate_model (std::vector< double > parameters) |
| A one-time generate function that permits model construction prior to calling the visibility_amplitude, closure_phase, etc. for each datum. Takes a vector of parameters. | |
| virtual void | generate_complex_visibilities () |
| A one-time generate function that will generate the complex visibilities and store them. This must be called after generate_model has been called. | |
| void | output_image (std::string fname, bool rotate=false) |
| void | get_image (std::vector< std::vector< double > > &alpha, std::vector< std::vector< double > > &beta, std::vector< std::vector< double > > &I) const |
| Provides direct access to the constructed image. Sets a 2D grid of angles (alpha, beta) in radians and intensities in Jy per steradian. | |
| void | get_visibilities (std::vector< std::vector< double > > &u, std::vector< std::vector< double > > &v, std::vector< std::vector< std::complex< double > > > &V) const |
| Provides direct access to the complex visibilities. Sets a 2D grid of baselines (u,v) in lambda, and visibilites in Jy. | |
| void | get_visibility_amplitudes (std::vector< std::vector< double > > &u, std::vector< std::vector< double > > &v, std::vector< std::vector< double > > &V) const |
| Provides direct access to the visibility amplitudes. Sets a 2D grid of baselines (u,v) in lambda, and visibilites in Jy. | |
| void | use_spline_interp (bool use_spline) |
| Provides ability to use bicubic spline interpolator (true) instead of regular bicubic. Code defaults to false. | |
| virtual void | set_mpi_communicator (MPI_Comm comm) |
| Defines a set of processors provided to the model for parallel computation via an MPI communicator. Only facilates code parallelization if the model computation is parallelized via MPI. | |
| void | write_model_tag_file (std::string tagfilename="model_image.tag") const |
| Write a unique identifying tag for use with the ThemisPy plotting features. This calls the overloaded version with the outstream, which is the only function that need be rewritten in child classes. | |
| virtual void | write_model_tag_file (std::ofstream &tagout) const |
| Write a unique identifying tag for use with the ThemisPy plotting features. For most child classes, the default implementation is suffcient. However, should that not be the case, this is the only function that need be rewritten in child classes. | |
Private Member Functions | |
| virtual void | generate_image (std::vector< double > parameters, std::vector< std::vector< double > > &I, std::vector< std::vector< double > > &alpha, std::vector< std::vector< double > > &beta) |
| Generates and returns rectalinear grid of intensities associated with the Crescent Image model in Jy/pixel located at pixels centered on angular positions alpha and beta, both specified in radians and aligned with a fiducial direction. Note that the parameter vector has had the position removed. | |
| double | BesselJ0 (double x) |
| Calculates the Bessel Function J1(x) | |
| double | BesselJ1 (double x) |
| Calculates the Bessel Function J1(x) | |
| double | BesselJ2 (double x) |
| Calculates the Bessel Function J2(x) | |
| std::complex< double > | complex_visibility (double u, double v) |
| Calculates the complex visibility amplitude. | |
Private Attributes | |
| double | _V0 |
| Internal total intensity. | |
| double | _Rext |
| Radius of the larger disc. | |
| double | _Rint |
| Radius of the smaller disc. | |
| double | _d |
| Distance between centers of the two disks. | |
| double | _f |
| The fading parameter. | |
| double | _sigma_alpha |
| Gaussian axis. | |
| double | _sigma_beta |
| Gaussian axis. | |
| double | _gq |
| Fraction of the Gaussian flux. | |
| int | _Nray |
| Image resolution. | |
| bool | _use_analytical_visibilities |
| If true uses analytical visibility computation; if false uses numerical visibilities. | |
Additional Inherited Members | |
| Protected Attributes inherited from model_image | |
| MPI_Comm | _comm |
| bool | _generated_model |
| True when a model is generated with generate_model. | |
| bool | _generated_visibilities |
| True when model visibilities have been computed. | |
| bool | _use_spline |
| True when want to use bicubic spline interpolator. | |
| double | _position_angle |
| Position angle of the image, assumed to be the last element of the parameter list passed to generate_model. Assumed to be in radians and defined E of N. | |
| std::vector< double > | _current_parameters |
| Last set of parameters passed to generate_image, useful to determine if it is necessary to recompute the model. Useful, e.g., if we are varying only position angle, or if recomputing for a number of different data sets at the same set of parameters. | |
| std::vector< std::vector< double > > | _alpha |
| 2D grid of horizonal pixel locations in radians, relative to the fiducial direction of the image (i.e., unrotated by the position angle). | |
| std::vector< std::vector< double > > | _beta |
| 2D grid of vertical pixel locations in radians, relative to the fiducial direction of the image (i.e., unrotated by the position angle). | |
| std::vector< std::vector< double > > | _I |
| 2D grid of intensities at pixel locations in Jy/str. | |
| Protected Attributes inherited from model_visibility | |
| MPI_Comm | _comm |
| Protected Attributes inherited from model_visibility_amplitude | |
| MPI_Comm | _comm |
| Protected Attributes inherited from model_closure_phase | |
| MPI_Comm | _comm |
| Protected Attributes inherited from model_closure_amplitude | |
| MPI_Comm | _comm |
Detailed Description
The Geometric Slashed Rint Model is created by substracting out a disc from the inside of a larger disc, both of constant intensity.
This model is defined by four parameters:
- parameters[0]: The total integrated flux in Jy.
- parameters[1]: \(R \) = The overall size.
- parameters[2]: \( \psi \) = The relative thickness.
- parameters[3]: \( \epsilon \) = The eccentricity.
- parameters[4]: \( f \) = The fading parameter.
- parameters[5]: \( g_{ax} \) = The main axis of the FWHM ellipse in units of \(R \)
- parameters[6]: \( a_{q} \) = The ellipse axial ratio
- parameters[7]: \( g_{q} \) = The ratio of the Gaussian flux in the total flux
- parameters[8]: \( \phi \) = The orientation (in model_image) in radians.
The documentation for this class was generated from the following files:
- model/model_image_xsringauss.h
- model/model_image_xsringauss.cpp