ConstantSpatialModel

class gammapy.modeling.models.ConstantSpatialModel(**kwargs)[source]

Bases: gammapy.modeling.models.SpatialModel

Spatially constant (isotropic) spatial model.

For more information see Constant spatial model.

Parameters
valueQuantity

Value

Attributes Summary

covariance

default_parameters

evaluation_radius

evaluation_region

Evaluation region

frame

frozen

Frozen status of a model, True if all parameters are frozen

is_energy_dependent

parameters

Parameters (Parameters)

phi_0

position

position_error

Get 95% containment position error as (EllipseSkyRegion)

tag

type

value

A model parameter.

Methods Summary

__call__(lon, lat[, energy])

Call evaluate method

copy()

A deep copy.

create(tag[, model_type])

Create a model instance.

evaluate(lon, lat, value)

Evaluate model.

evaluate_geom(geom)

Evaluate model on Geom

freeze()

Freeze all parameters

from_dict(data)

from_parameters(parameters, **kwargs)

Create model from parameter list

from_position(position, **kwargs)

Define the position of the model using a sky coord

integrate_geom(geom)

Integrate model on Geom or RegionGeom.

plot([ax, geom])

Plot spatial model.

plot_error([ax])

Plot position error

plot_grid([geom])

Plot spatial model energy slices in a grid.

plot_interative([ax, geom])

Plot spatial model.

reassign(datasets_names, new_datasets_names)

Reassign a model from one dataset to another

to_dict([full_output])

Create dict for YAML serilisation

to_region(**kwargs)

Model outline (EllipseSkyRegion).

unfreeze()

Restore parameters frozen status to default

Attributes Documentation

covariance
default_parameters = <gammapy.modeling.parameter.Parameters object>
evaluation_radius = None
evaluation_region

Evaluation region

frame = 'icrs'
frozen

Frozen status of a model, True if all parameters are frozen

is_energy_dependent
parameters

Parameters (Parameters)

phi_0
position = None
position_error

Get 95% containment position error as (EllipseSkyRegion)

tag = ['ConstantSpatialModel', 'const']
type
value

A model parameter.

Note that the parameter value has been split into a factor and scale like this:

value = factor x scale

Users should interact with the value, quantity or min and max properties and consider the fact that there is a factor` and scale an implementation detail.

That was introduced for numerical stability in parameter and error estimation methods, only in the Gammapy optimiser interface do we interact with the factor, factor_min and factor_max properties, i.e. the optimiser “sees” the well-scaled problem.

Parameters
namestr

Name

valuefloat or Quantity

Value

scalefloat, optional

Scale (sometimes used in fitting)

unitUnit or str, optional

Unit

minfloat, optional

Minimum (sometimes used in fitting)

maxfloat, optional

Maximum (sometimes used in fitting)

frozenbool, optional

Frozen? (used in fitting)

Methods Documentation

__call__(lon, lat, energy=None)

Call evaluate method

copy()

A deep copy.

static create(tag, model_type=None, *args, **kwargs)

Create a model instance.

Examples

>>> from gammapy.modeling.models import Model
>>> spectral_model = Model.create("pl-2", model_type="spectral", amplitude="1e-10 cm-2 s-1", index=3)
>>> type(spectral_model)
<class 'gammapy.modeling.models.spectral.PowerLaw2SpectralModel'>
static evaluate(lon, lat, value)[source]

Evaluate model.

evaluate_geom(geom)

Evaluate model on Geom

Parameters
geomWcsGeom
Returns
Map
freeze()

Freeze all parameters

classmethod from_dict(data)
classmethod from_parameters(parameters, **kwargs)

Create model from parameter list

Parameters
parametersParameters

Parameters for init

Returns
modelModel

Model instance

classmethod from_position(position, **kwargs)

Define the position of the model using a sky coord

Parameters
positionSkyCoord

Position

Returns
modelSpatialModel

Spatial model

integrate_geom(geom)

Integrate model on Geom or RegionGeom.

Parameters
geomWcsGeom or RegionGeom
Returns
Map or gammapy.maps.RegionNDMap, containing

the integral value in each spatial bin.

plot(ax=None, geom=None, **kwargs)

Plot spatial model.

Parameters
axAxes, optional

Axis

geomWcsGeom, optional

Geom to use for plotting.

**kwargsdict

Keyword arguments passed to plot()

Returns
axAxes, optional

Axis

plot_error(ax=None, **kwargs)

Plot position error

Parameters
axAxes, optional

Axis

**kwargsdict

Keyword arguments passed to plot()

Returns
axAxes, optional

Axis

plot_grid(geom=None, **kwargs)

Plot spatial model energy slices in a grid.

Parameters
geomWcsGeom, optional

Geom to use for plotting.

**kwargsdict

Keyword arguments passed to plot()

Returns
axAxes, optional

Axis

plot_interative(ax=None, geom=None, **kwargs)

Plot spatial model.

Parameters
axAxes, optional

Axis

geomWcsGeom, optional

Geom to use for plotting.

**kwargsdict

Keyword arguments passed to plot()

Returns
axAxes, optional

Axis

reassign(datasets_names, new_datasets_names)

Reassign a model from one dataset to another

Parameters
datasets_namesstr or list

Name of the datasets where the model is currently defined

new_datasets_namesstr or list

Name of the datasets where the model should be defined instead. If multiple names are given the two list must have the save lenght, as the reassignment is element-wise.

Returns
modelModel

Reassigned model.

to_dict(full_output=False)[source]

Create dict for YAML serilisation

static to_region(**kwargs)[source]

Model outline (EllipseSkyRegion).

unfreeze()

Restore parameters frozen status to default