fisher_derived

class cosmicjellyfish.analysis.fisher_derived.fisher_derived(derived_matrix=None, param_names=None, derived_param_names=None, param_names_latex=None, derived_param_names_latex=None, fiducial=None, fiducial_derived=None, file_name=None)

Bases: object

This class contains the relevant code to define a matrix that contains the relevant information to reparametrize a Fisher matrix. Generally this is a rectangular matrix containing the Jacobian of the transformation from the original Fisher to the derived one. :ivar derived_matrix: Numpy array containing the Jacobian of the transformation between the Fisher matrix and the derived Fisher matrix. Passed to the constructor of by file. :ivar path: Absolute path of the input Jacobian matrix. Computed at initialization if passing a file. :ivar name: Name of the input Jacobian matrix. Computed at initialization if passing a file. :ivar indir: Absolute path of the directory containing the input Jacobian matrix. Computed at initialization if passing a file. :ivar num_params: Number of base parameters of the Jacobian matrix. :ivar num_derived: Number of derived parameters. :ivar param_names: Names of the base parameters. Used as the identifier of the parameters. Initialized, if possible, through a .paramnames file. :ivar param_names_latex: LaTeX names of the base parameters. :ivar param_fiducial: Numpy array with the values of the fiducial of the base parameters. Passed to the constructor or by file. :ivar derived_param_names: Names of the derived parameters. Used as the identifier of the parameters. Initialized, if possible, through a .paramnames file. :ivar derived_param_names_latex: LaTeX names of the derived parameters. :ivar derived_param_fiducial: Numpy array with the values of the fiducial of the derived parameters. Passed to the constructor or by file.

get_derived_matrix()

Returns:

the derived Jacobian matrix.

get_param_names()

Returns:

the base parameter names.

get_param_names_latex()

Returns:

the LaTeX version of the base parameter names.

get_param_fiducial()

Returns:

the base parameter fiducial values.

get_derived_param_names()

Returns:

the derived parameters names.

get_derived_param_names_latex()

Returns:

the LaTeX version of the derived parameters names.

get_derived_param_fiducial()

Returns:

the derived parameter fiducial values.

load_paramnames_from_file(file_name=None)

Loads the paramnames array, of a derived Fisher matrix, from a file

Parameters:

file_name (string) – (optional) file name and path of the parameter names file. If file_name is None this reads the file self.name+.paramnames.

add_derived(fisher_matrix, preserve_input=False)

This function computes the derived fisher_matrix given an input Fisher matrix based on the Jacobian contained in derived_matrix.

Parameters:

• fisher_matrix (cosmicfish_pylib.fisher_matrix.fisher_matrix) – input Fisher matrix that will be used as a base for the derived Fisher matrix.

• preserve_input (bool) – wether to preserve input parameters in the output Fisher. Default to false because it might lead to strage results if not used properly.

Returns:

output Fisher matrix with derived parameters.

Return type:

cosmicfish_pylib.fisher_matrix.fisher_matrix