Creates a set of galaxy images. That is, and array of images each of which has a particular realization of a galaxy model. This module creates two separate arrays: one in which the galaxies have been biased by some constant amount ("Biased"), and a second in which the galaxies have no such distortion bias (gamma1=gamma2=0, "Unbiased").

The output of this module is as a base for many simulation chains, and as an intermediate step in several others.

There are many different options to this module. The module can optionally increase the galaxy counts each time its process() stage is called. The centers of galaxies can be fixed to the center of the images, or can be moved randomly. This module can optionally create "Big" galaxies, which are placed in a special spot in memory and often serve as a base to create derivative galaxy sets (with ReduceGalSet for instance).

Parameters

Name	Type	Description
BiasedCount	int	Number of biased galaxies to create.
UnbiasedCount	int	Number of unbiased galaxies to create.
BiasedStep	int	Amount to increase BiasedCount during each process(). Default is 0.
UnbiasedStep	int	Amount to increase UnbiasedCount during each process(). Default is 0.
BiasedMax	int	Maximum number of biased galaxies (useful only with BiasedStep).
UnbiasedMax	int	Maximum number of unbiased galaxies (useful only with UnbiasedStep).
Gamma1	double	Amount of constant x-y shear bias to put in biased galaxies.
Gamma2	double	Amount of constant 45deg to x-y shear bias to put in biased galaxies.
GalTag	string	Tag name of galaxy model to use when drawing the galaxies.
Width	int	Pixel width of each image.
Height	int	Pixel height of each image.
MoveCenter	keyword	If set, randomly move the center of the galaxies.
CenterRadius	double	Keep the center of each galaxy within this radius of the center of the image. Useful only if CenterRadius is set.
Seed	int	Value to seed random number generator with. If not specified, a random seed is used.
Big	keyword	If specified, place galaxy images into variables labeled "Big" as specified below.
Verbose	keyword	If set, print debugging information to cout.

Inputs

Name	Type	Description

Outputs

Name	Type	Description
GalSet/Gamma1	double	The amount of shear in x-y direction with which the biased galaxies were biased.
GalSet/Gamma2	double	The amount of shear 45deg to x-y direction with which the biased galaxies were biased.
GalSet/BiasedImages	double*	Array of pixel values for the biased galaxy images.
GalSet/BiasedCount	int	Number of biased images created.
GalSet/BiasedCentX	double*	X-coordinate of the center about which the galaxy was created.
GalSet/BiasedCentY	double*	Y-coordinate of the center about which the galaxy was created.
GalSet/UnbiasedImages	double*	Array of pixel values for the unbiased galaxy images.
GalSet/UnbiasedCount	int	Number of unbiased images created.
GalSet/UnbiasedCentX	double*	X-coordinate of the center about which the galaxy was created.
GalSet/UnbiasedCentY	double*	Y-coordinate of the center about which the galaxy was created.
GalSet/Seed	int	Seed used to generate these images.

Note: If the "Big" keyword is set, all of the above variable names except for Gamma1, Gamma2, Seed, BiasedCount and UnbiasedCount will be prepended by the string "Big". So BigWidth, BigUnbiasedImages etc.