sage_analysis.sage_binary

This module defines the SageBinaryData class. This class interfaces with the Model class to read in binary data written by SAGE. The value of sage_output_format is generally sage_binary if it is to be read with this class.

We refer to Ingesting Custom Data for more information about adding your own Data Class to ingest data.

Author: Jacob Seiler.

class sage_analysis.sage_binary.SageBinaryData(model: sage_analysis.model.Model, sage_file_to_read: str)

Class intended to inteface with the Model class to ingest the data written by SAGE. It includes methods for reading the output galaxies, setting cosmology etc. It is specifically written for when sage_output_format is sage_binary.

_read_sage_params(sage_file_path: str) → Dict[str, Any]

Read the SAGE parameter file.

Parameters:sage_file_path (string) – Path to the SAGE parameter file. Returns:model_dict – Dictionary containing the parameter names and their values. Return type:dict [str, var]

determine_num_gals(model: sage_analysis.model.Model, *args)

Determines the number of galaxies in all files for this Model.

Parameters:

• model (Model class) – The Model we’re reading data for.
• *args (Any) – Extra arguments to allow other data class to pass extra arguments to their version of determine_num_gals.

determine_volume_analyzed(model: sage_analysis.model.Model) → float

Determines the volume analyzed. This can be smaller than the total simulation box.

Parameters:model (Model instance) – The model that this data class is associated with. Returns:volume – The numeric volume being processed during this run of the code in (Mpc/h)^3. Return type:float

get_galaxy_struct()

Sets the numpy structured array for holding the galaxy data.

read_gals(model, file_num, pbar=None, plot_galaxies=False, debug=False)

Reads the galaxies of a model file at snapshot specified by snapshot.

Parameters:

• model (Model class) – The Model we’re reading data for.
• file_num (int) – Suffix number of the file we’re reading.
• pbar (tqdm class instance, optional) – Bar showing the progress of galaxy reading. If None, progress bar will not show.
• plot_galaxies (bool, optional) – If set, plots and saves the 3D distribution of galaxies for this file.
• debug (bool, optional) – If set, prints out extra useful debug information.

Returns:

gals – The galaxies for this file.

Return type:

numpy structured array with format given by get_galaxy_struct()

Notes

tqdm does not play nicely with printing to stdout. Hence we disable the tqdm progress bar if debug=True.

update_snapshot_and_data_path(model: sage_analysis.model.Model, snapshot: int)

Updates the _sage_data_path to point to a new redshift file. Uses the redshift array redshifts.

Parameters:snapshot (int) – Snapshot we’re updating _sage_data_path to point to.