def image(self, array, shape=None, newframe=False, tile=False):
newframe = bool_cast(newframe)
tile = bool_cast(tile)
if shape is None:
backend.image(array, newframe, tile)
else:
backend.image(array.reshape(shape), newframe, tile)
def image(self, array, shape=None, newframe=False, tile=False):
newframe = bool_cast(newframe)
tile = bool_cast(tile)
if shape is None:
backend.image(array, newframe, tile)
else:
backend.image(array.reshape(shape), newframe, tile)
def get_indep(self, filter=False):
filter = bool_cast(filter)
if filter:
return (self._x0lo, self._x1lo, self._x2lo, self._x0hi, self._x1hi,
self._x2hi)
return (self.x0lo, self.x1lo, self.x2lo, self.x0hi, self.x1hi,
self.x2hi)
def get_dep(self, filter=False):
"Return an array of dependent variable values"
dep = getattr(self, 'dep', None)
filter=bool_cast(filter)
if filter:
dep = self.apply_filter(dep)
return dep
def notice(self, mins, maxes, axislist, ignore=False):
ignore = bool_cast(ignore)
if str in [type(min) for min in mins]:
raise DataErr('typecheck', 'lower bound')
elif str in [type(max) for max in maxes]:
raise DataErr('typecheck', 'upper bound')
elif str in [type(axis) for axis in axislist]:
raise DataErr('typecheck', 'grid')
mask = filter_bins(mins, maxes, axislist)
if mask is None:
self.mask = not ignore
elif not ignore:
if self.mask is True:
self.mask = mask
else:
self.mask |= mask
else:
mask = ~mask
if self.mask is False:
self.mask = mask
else:
self.mask &= mask
def get_indep(self, filter=False, model=None):
"""Return the independent axes of a data set.
Parameters
----------
filter : bool, optional
Should the filter attached to the data set be applied to
the return value or not. The default is `False`.
Returns
-------
axis: tuple of arrays
The independent axis values for the data set. This gives
the coordinates of each point in the data set.
See Also
--------
get_dep : Return the dependent axis of a data set.
"""
indep = getattr(self, 'indep', None)
filter = bool_cast(filter)
if filter:
indep = tuple([self.apply_filter(x) for x in indep])
return indep
def _get_data_space(self, filter):
"""
Return the data space for this object. The method is called by the get_x and get_indep methods, which need
an EvaluationSpace1D representation of the data space to return the appropriate data to the client.
This is a hook method providing the default implementation for subclasses. Subclasses should override this
method to provide alternative callback when the default implementation does not apply to the new class.
At this point, this means that if you develop a subclass you should be aware of the default implementation and
override it if it does not apply to your subclass. Future versions of Sherpa may implement a cleaner and more
extensible API.
Parameters
----------
filter : bool or string to be parsed as bool
Whether the data returned should be filtered or not.
Returns
-------
data_space : EvaluationSpace1D
An instance of the EvaluationSpace1D representing the data space for this object.
"""
filter = bool_cast(filter)
if filter:
data_x = self._x
else:
data_x = self.x
return EvaluationSpace1D(data_x)
def get_dep(self, filter=False):
"""Return the dependent axis of a data set.
Parameters
----------
filter : bool, optional
Should the filter attached to the data set be applied to
the return value or not. The default is `False`.
Returns
-------
axis: array
The dependent axis values for the data set. This gives
the value of each point in the data set.
See Also
--------
get_indep : Return the independent axis of a data set.
get_error : Return the errors on the dependent axis of a data set.
get_staterror : Return the statistical errors on the dependent axis of a data set.
get_syserror : Return the systematic errors on the dependent axis of a data set.
"""
dep = getattr(self, 'dep', None)
filter = bool_cast(filter)
if filter:
dep = self.apply_filter(dep)
return dep
def get_syserror(self, filter=False):
"""Return the statistical error on the dependent axis of a data set.
Parameters
----------
filter : bool, optional
Should the filter attached to the data set be applied to
the return value or not. The default is `False`.
Returns
-------
axis : array or `None`
The systematic error for each data point. A value of
`None` is returned if the data set has no systematic
errors.
See Also
--------
get_error : Return the errors on the dependent axis of a data set.
get_indep : Return the independent axis of a data set.
get_staterror : Return the statistical errors on the dependent axis of a data set.
"""
syserr = getattr(self, 'syserror', None)
filter = bool_cast(filter)
if filter:
syserr = self.apply_filter(syserr)
return syserr
def get_indep(self, filter=False, model=None):
"""Return the independent axes of a data set.
Parameters
----------
filter : bool, optional
Should the filter attached to the data set be applied to
the return value or not. The default is `False`.
Returns
-------
axis: tuple of arrays
The independent axis values for the data set. This gives
the coordinates of each point in the data set.
See Also
--------
get_dep : Return the dependent axis of a data set.
"""
indep = getattr(self, 'indep', None)
filter = bool_cast(filter)
if filter:
indep = tuple([self.apply_filter(x) for x in indep])
return indep
def get_dep(self, filter=False):
"""Return the dependent axis of a data set.
Parameters
----------
filter : bool, optional
Should the filter attached to the data set be applied to
the return value or not. The default is `False`.
Returns
-------
axis: array
The dependent axis values for the data set. This gives
the value of each point in the data set.
See Also
--------
get_indep : Return the independent axis of a data set.
get_error : Return the errors on the dependent axis of a data set.
get_staterror : Return the statistical errors on the dependent axis of a data set.
get_syserror : Return the systematic errors on the dependent axis of a data set.
"""
dep = getattr(self, 'dep', None)
filter = bool_cast(filter)
if filter:
dep = self.apply_filter(dep)
return dep
def notice(self, mins, maxes, axislist, ignore=False):
ignore = bool_cast(ignore)
if str in [type(min) for min in mins]:
raise DataErr('typecheck', 'lower bound')
elif str in [type(max) for max in maxes]:
raise DataErr('typecheck', 'upper bound')
elif str in [type(axis) for axis in axislist]:
raise DataErr('typecheck', 'grid')
mask = filter_bins(mins, maxes, axislist)
if mask is None:
self.mask = not ignore
elif not ignore:
if self.mask is True:
self.mask = mask
else:
self.mask |= mask
else:
mask = ~mask
if self.mask is False:
self.mask = mask
else:
self.mask &= mask
def get_syserror(self, filter=False):
"""Return the statistical error on the dependent axis of a data set.
Parameters
----------
filter : bool, optional
Should the filter attached to the data set be applied to
the return value or not. The default is `False`.
Returns
-------
axis : array or `None`
The systematic error for each data point. A value of
`None` is returned if the data set has no systematic
errors.
See Also
--------
get_error : Return the errors on the dependent axis of a data set.
get_indep : Return the independent axis of a data set.
get_staterror : Return the statistical errors on the dependent axis of a data set.
"""
syserr = getattr(self, 'syserror', None)
filter = bool_cast(filter)
if filter:
syserr = self.apply_filter(syserr)
return syserr
def _get_data_space(self, filter):
"""
Return the data space for this object. The method is called by the get_x and get_indep methods, which need
an EvaluationSpace1D representation of the data space to return the appropriate data to the client.
This is a hook method providing the default implementation for subclasses. Subclasses should override this
method to provide alternative callback when the default implementation does not apply to the new class.
At this point, this means that if you develop a subclass you should be aware of the default implementation and
override it if it does not apply to your subclass. Future versions of Sherpa may implement a cleaner and more
extensible API.
Parameters
----------
filter : bool or string to be parsed as bool
Whether the data returned should be filtered or not.
Returns
-------
data_space : EvaluationSpace1D
An instance of the EvaluationSpace1D representing the data space for this object.
"""
filter = bool_cast(filter)
if filter:
data_x = self._x
else:
data_x = self.x
return EvaluationSpace1D(data_x)
def get_indep(self, filter=False):
"Return a tuple containing the independent variables/axes"
indep = getattr(self, 'indep', None)
filter=bool_cast(filter)
if filter:
indep = tuple([self.apply_filter(x) for x in indep])
return indep
def get_syserror(self, filter=False):
"Return the systematic error array"
syserr = getattr(self, 'syserror', None)
filter=bool_cast(filter)
if filter:
syserr = self.apply_filter(syserr)
return syserr
def get_staterror(self, filter=False, staterrfunc=None):
"Return the statistical error array"
staterror = getattr(self, 'staterror', None)
filter=bool_cast(filter)
if filter:
staterror = self.apply_filter(staterror)
if (staterror is None) and (staterrfunc is not None):
dep = self.get_dep()
if filter:
dep = self.apply_filter(dep)
staterror = staterrfunc(dep)
return staterror
def get(self, filter=False):
"""
Get a filtered representation of this data set. If `filter` is `False` this object is returned.
Parameters
----------
filter : bool
whether the data set should be filtered before being returned
Returns
-------
DataSpaceND
"""
filter = bool_cast(filter)
if not filter:
return self
data = tuple(self.filter.apply(axis) for axis in self.indep)
return DataSpaceND(self.filter, data)
def get_staterror(self, filter=False, staterrfunc=None):
"""Return the statistical error on the dependent axis of a data set.
Parameters
----------
filter : bool, optional
Should the filter attached to the data set be applied to
the return value or not. The default is `False`.
staterrfunc : function
If no statistical error has been set, the errors will
be calculated by applying this function to the
dependent axis of the data set.
Returns
-------
axis : array or `None`
The statistical error for each data point. A value of
`None` is returned if the data set has no statistical error
array and `staterrfunc` is `None`.
See Also
--------
get_error : Return the errors on the dependent axis of a data set.
get_indep : Return the independent axis of a data set.
get_syserror : Return the systematic errors on the dependent axis of a data set.
"""
staterror = getattr(self, 'staterror', None)
filter = bool_cast(filter)
if filter:
staterror = self.apply_filter(staterror)
if (staterror is None) and (staterrfunc is not None):
dep = self.get_dep()
if filter:
dep = self.apply_filter(dep)
staterror = staterrfunc(dep)
return staterror
def get_staterror(self, filter=False, staterrfunc=None):
"""Return the statistical error on the dependent axis of a data set.
Parameters
----------
filter : bool, optional
Should the filter attached to the data set be applied to
the return value or not. The default is `False`.
staterrfunc : function
If no statistical error has been set, the errors will
be calculated by applying this function to the
dependent axis of the data set.
Returns
-------
axis : array or `None`
The statistical error for each data point. A value of
`None` is returned if the data set has no statistical error
array and `staterrfunc` is `None`.
See Also
--------
get_error : Return the errors on the dependent axis of a data set.
get_indep : Return the independent axis of a data set.
get_syserror : Return the systematic errors on the dependent axis of a data set.
"""
staterror = getattr(self, 'staterror', None)
filter = bool_cast(filter)
if filter:
staterror = self.apply_filter(staterror)
if (staterror is None) and (staterrfunc is not None):
dep = self.get_dep()
if filter:
dep = self.apply_filter(dep)
staterror = staterrfunc(dep)
return staterror
def get_indep(self, filter=False):
filter = bool_cast(filter)
if filter:
return (self._x0lo, self._x1lo, self._x0hi, self._x1hi)
return (self.x0lo, self.x1lo, self.x0hi, self.x1hi)
def get_indep(self, filter=False):
filter = bool_cast(filter)
if filter:
return (self._lo, self._hi, self._x1, self._x2)
return (self.xlo, self.xhi, self.x1, self.x2)
def _get_data_space(self, filter=False):
filter = bool_cast(filter)
if filter:
return EvaluationSpace1D(self._lo, self._hi)
return EvaluationSpace1D(self.xlo, self.xhi)
def get_indep(self, filter=False, model=None ):
filter = bool_cast(filter)
if filter:
return (self._x0, self._x1)
return (self.x0, self.x1)
def get_dep(self, filter=False):
y = self.y
filter = bool_cast(filter)
if filter:
y = self.apply_filter(y)
return y
def calc(self, *args, **kwargs):
kwargs['integrate'] = bool_cast(self.integrate)
return _modelfcts.hr(*args, **kwargs)
def get_indep(self, filter=False, model=None):
filter = bool_cast(filter)
if filter:
return (self._x0, self._x1)
return (self.x0, self.x1)
def get_indep(self, filter=False):
filter = bool_cast(filter)
if filter:
return (self._x, )
return (self.x, )
def get_dep(self, filter=False):
y = self.y
filter = bool_cast(filter)
if filter:
y = self.apply_filter(y)
return y
def fold(self, data):
# FIXME how will we know the native dimensionality of the
# raveled model without the values?
kargs = {}
kshape = None
dshape = data.get_dims()
(size, center, origin, kargs['norm'],
radial) = (self.size, self.center, self.origin,
bool_cast(self.norm.val), int(self.radial.val))
kargs['size'] = size
kargs['center'] = center
kargs['origin'] = origin
kargs['is_model'] = False
kargs['do_pad'] = False
kargs['args'] = data.get_indep()
pixel_size_comparison = self._check_pixel_size(data)
if pixel_size_comparison == self.SAME_RESOLUTION: # Don't do anything special
self.data_space = EvaluationSpace2D(*data.get_indep())
self._must_rebin = False
elif pixel_size_comparison == self.BETTER_RESOLUTION: # Evaluate model in PSF space
self.data_space = EvaluationSpace2D(*data.get_indep())
self.psf_space = PSFSpace2D(self.data_space, self, data.sky.cdelt)
kargs['args'] = self.psf_space.grid
dshape = self.psf_space.shape
self._must_rebin = True
else: # PSF has worse resolution, error out
raise AttributeError(
"The PSF has a worse resolution than the data.")
if isinstance(self.kernel, Data):
kshape = self.kernel.get_dims()
# (kargs['lo'], kargs['hi'],
# kargs['width']) = _get_axis_info(self.kernel.get_indep(), kshape)
kargs['lo'] = [1] * len(kshape)
kargs['hi'] = kshape
kargs['width'] = [1] * len(kshape)
if center is None:
kargs['center'] = [int(dim / 2.) for dim in kshape]
# update center param to default
self.center = kargs['center']
if size is None:
kargs['size'] = kshape
# update size param to default
self.size = kargs['size']
else:
if (self.kernel is None) or (not callable(self.kernel)):
raise PSFErr('nopsf', self._name)
kshape = data.get_dims()
# (kargs['lo'], kargs['hi'],
# kargs['width']) = _get_axis_info(kargs['args'], dshape)
kargs['lo'] = [1] * len(kshape)
kargs['hi'] = kshape
kargs['width'] = [1] * len(kshape)
if center is None:
kargs['center'] = [int(dim / 2.) for dim in dshape]
# update center param to default
self.center = kargs['center']
if size is None:
kargs['size'] = dshape
# update size param to default
self.size = kargs['size']
kargs['is_model'] = True
if hasattr(self.kernel, 'pars'):
# freeze all PSF model parameters if not already.
for par in self.kernel.pars:
par.freeze()
if hasattr(self.kernel, 'thawedpars'):
kargs['frozen'] = (len(self.kernel.thawedpars) == 0)
is_kernel = (kargs['is_model'] and not kargs['norm']
and len(kshape) == 1)
# Handle noticed regions for convolution
if numpy.iterable(data.mask):
kargs['do_pad'] = True
kargs['pad_mask'] = data.mask
if is_kernel:
for id in ['is_model', 'lo', 'hi', 'width', 'size']:
kargs.pop(id)
self.model = Kernel(dshape, kshape, **kargs)
return
if radial:
self.model = RadialProfileKernel(dshape, kshape, **kargs)
return
self.model = PSFKernel(dshape, kshape, **kargs)
return
def _get_data_space(self, filter=False):
filter = bool_cast(filter)
if filter:
return EvaluationSpace1D(self._lo, self._hi)
return EvaluationSpace1D(self.xlo, self.xhi)
def get_indep(self, filter=False):
filter=bool_cast(filter)
if filter:
return (self._lo, self._hi)
return (self.xlo, self.xhi)
def get_indep(self, filter=False):
filter=bool_cast(filter)
if filter:
return (self._x,)
return (self.x,)
def fold(self, data):
# FIXME how will we know the native dimensionality of the
# raveled model without the values?
kargs={}
kshape = None
dshape = data.get_dims()
(size, center, origin,
kargs['norm'], radial) = (self.size, self.center, self.origin,
bool_cast(self.norm.val),
int(self.radial.val))
kargs['size'] = size
kargs['center'] = center
kargs['origin'] = origin
kargs['is_model']=False
kargs['do_pad']=False
kargs['args'] = data.get_indep()
if isinstance(self.kernel, Data):
kshape = self.kernel.get_dims()
#(kargs['lo'], kargs['hi'],
# kargs['width']) = _get_axis_info(self.kernel.get_indep(), kshape)
kargs['lo'] = [1]*len(kshape)
kargs['hi'] = kshape
kargs['width'] = [1]*len(kshape)
if center is None:
kargs['center'] = [int(dim/2.) for dim in kshape]
# update center param to default
self.center = kargs['center']
if size is None:
kargs['size'] = kshape
# update size param to default
self.size = kargs['size']
else:
if (self.kernel is None) or (not callable(self.kernel)):
raise PSFErr('nopsf', self._name)
kshape = data.get_dims()
#(kargs['lo'], kargs['hi'],
# kargs['width']) = _get_axis_info(kargs['args'], dshape)
kargs['lo'] = [1]*len(kshape)
kargs['hi'] = kshape
kargs['width'] = [1]*len(kshape)
if center is None:
kargs['center'] = [int(dim/2.) for dim in dshape]
# update center param to default
self.center = kargs['center']
if size is None:
kargs['size'] = dshape
# update size param to default
self.size = kargs['size']
kargs['is_model']=True
if hasattr(self.kernel, 'pars'):
# freeze all PSF model parameters if not already.
for par in self.kernel.pars:
par.freeze()
if hasattr(self.kernel, 'thawedpars'):
kargs['frozen'] = (len(self.kernel.thawedpars) == 0)
# check size of self.size to ensure <= dshape for 2D
# if len(dshape) > 1:
# dsize = numpy.asarray(dshape)
# ksize = numpy.asarray(self.size)
# if True in (ksize>dsize):
# raise PSFErr('badsize', ksize, dsize)
is_kernel = (kargs['is_model'] and not kargs['norm'] and
len(kshape) == 1)
# Handle noticed regions for convolution
if numpy.iterable(data.mask):
kargs['do_pad'] = True
kargs['pad_mask'] = data.mask
if is_kernel:
for id in ['is_model','lo','hi','width','size']:
kargs.pop(id)
self.model = Kernel(dshape, kshape, **kargs)
return
if radial:
self.model = RadialProfileKernel(dshape, kshape, **kargs)
return
self.model = PSFKernel(dshape, kshape, **kargs)
return
def fold(self, data):
# FIXME how will we know the native dimensionality of the
# raveled model without the values?
self._check_pixel_size(data)
kargs = {}
kshape = None
dshape = data.get_dims()
(size, center, origin,
kargs['norm'], radial) = (self.size, self.center, self.origin,
bool_cast(self.norm.val),
int(self.radial.val))
kargs['size'] = size
kargs['center'] = center
kargs['origin'] = origin
kargs['is_model'] = False
kargs['do_pad'] = False
kargs['args'] = data.get_indep()
if isinstance(self.kernel, Data):
kshape = self.kernel.get_dims()
# (kargs['lo'], kargs['hi'],
# kargs['width']) = _get_axis_info(self.kernel.get_indep(), kshape)
kargs['lo'] = [1] * len(kshape)
kargs['hi'] = kshape
kargs['width'] = [1] * len(kshape)
if center is None:
kargs['center'] = [int(dim / 2.) for dim in kshape]
# update center param to default
self.center = kargs['center']
if size is None:
kargs['size'] = kshape
# update size param to default
self.size = kargs['size']
else:
if (self.kernel is None) or (not callable(self.kernel)):
raise PSFErr('nopsf', self._name)
kshape = data.get_dims()
# (kargs['lo'], kargs['hi'],
# kargs['width']) = _get_axis_info(kargs['args'], dshape)
kargs['lo'] = [1] * len(kshape)
kargs['hi'] = kshape
kargs['width'] = [1] * len(kshape)
if center is None:
kargs['center'] = [int(dim / 2.) for dim in dshape]
# update center param to default
self.center = kargs['center']
if size is None:
kargs['size'] = dshape
# update size param to default
self.size = kargs['size']
kargs['is_model'] = True
if hasattr(self.kernel, 'pars'):
# freeze all PSF model parameters if not already.
for par in self.kernel.pars:
par.freeze()
if hasattr(self.kernel, 'thawedpars'):
kargs['frozen'] = (len(self.kernel.thawedpars) == 0)
# check size of self.size to ensure <= dshape for 2D
# if len(dshape) > 1:
# dsize = numpy.asarray(dshape)
# ksize = numpy.asarray(self.size)
# if True in (ksize>dsize):
# raise PSFErr('badsize', ksize, dsize)
is_kernel = (kargs['is_model'] and not kargs['norm'] and
len(kshape) == 1)
# Handle noticed regions for convolution
if numpy.iterable(data.mask):
kargs['do_pad'] = True
kargs['pad_mask'] = data.mask
if is_kernel:
for id in ['is_model', 'lo', 'hi', 'width', 'size']:
kargs.pop(id)
self.model = Kernel(dshape, kshape, **kargs)
return
if radial:
self.model = RadialProfileKernel(dshape, kshape, **kargs)
return
self.model = PSFKernel(dshape, kshape, **kargs)
return
def est_errors(self, methoddict=None, parlist=None):
# Define functions to freeze and thaw a parameter before
# we call fit function -- projection can call fit several
# times, for each parameter -- that parameter must be frozen
# while the others freely vary.
def freeze_par(pars, parmins, parmaxes, i):
# Freeze the indicated parameter; return
# its place in the list of all parameters,
# and the current values of the parameters,
# and the hard mins amd maxs of the parameters
self.model.pars[self.thaw_indices[i]].val = pars[i]
self.model.pars[self.thaw_indices[i]].frozen = True
self.current_frozen = self.thaw_indices[i]
keep_pars = ones_like(pars)
keep_pars[i] = 0
current_pars = pars[where(keep_pars)]
current_parmins = parmins[where(keep_pars)]
current_parmaxes = parmaxes[where(keep_pars)]
return (current_pars, current_parmins, current_parmaxes)
def thaw_par(i):
if (i < 0):
pass
else:
self.model.pars[self.thaw_indices[i]].frozen = False
self.current_frozen = -1
# confidence needs to know which parameter it is working on.
def get_par_name( ii ):
return self.model.pars[self.thaw_indices[ii]].fullname
# Call from a parameter estimation method, to report
# that limits for a given parameter have been found
def report_progress(i, lower, upper):
if (i < 0):
pass
else:
name = self.model.pars[self.thaw_indices[i]].fullname
if isnan(lower) or isinf(lower):
info("%s \tlower bound: -----" % name)
else:
info("%s \tlower bound: %g" % (name, lower))
if isnan(upper) or isinf(upper):
info("%s \tupper bound: -----" % name)
else:
info("%s \tupper bound: %g" % (name, upper))
# If starting fit statistic is chi-squared or C-stat,
# can calculate reduced fit statistic -- if it is
# more than 3, don't bother calling method to estimate
# parameter limits.
if (type(self.stat) is LeastSq):
#raise FitError('cannot estimate confidence limits with ' +
# type(self.stat).__name__)
raise EstErr( 'noerr4least2', type(self.stat).__name__)
if (type(self.stat) is not Cash):
dep, staterror, syserror = self.data.to_fit(
self.stat.calc_staterror)
if not iterable(dep) or len(dep) == 0:
#raise FitError('no noticed bins found in data set')
raise FitErr( 'nobins' )
# For chi-squared and C-stat, reduced statistic is
# statistic value divided by number of degrees of
# freedom.
# Degress of freedom are number of data bins included
# in fit, minus the number of thawed parameters.
dof = len(dep) - len(self.model.thawedpars)
if (dof < 1):
#raise FitError('degrees of freedom are zero or lower')
raise EstErr( 'nodegfreedom' )
if (hasattr(self.estmethod, "max_rstat") and
(self.calc_stat() / dof) > self.estmethod.max_rstat):
#raise FitError('reduced statistic larger than ' +
# str(self.estmethod.max_rstat))
raise EstErr( 'rstat>max', str(self.estmethod.max_rstat) )
# If statistic is chi-squared, change fitting method to
# Levenberg-Marquardt; else, switch to NelderMead. (We
# will do fitting during projection, and therefore don't
# want to use LM with a stat other than chi-squared).
# If current method is not LM or NM, warn it is not a good
# method for estimating parameter limits.
if (type(self.estmethod) is not Covariance and
type(self.method) is not NelderMead and
type(self.method) is not LevMar):
warning(self.method.name + " is inappropriate for confidence " +
"limit estimation")
oldmethod = self.method
if (hasattr(self.estmethod, "fast") and
bool_cast(self.estmethod.fast) is True and
methoddict is not None):
if (isinstance(self.stat, Likelihood) ):
if (type(self.method) is not NelderMead):
self.method = methoddict['neldermead']
warning("Setting optimization to " + self.method.name
+ " for confidence limit search")
else:
if (type(self.method) is not LevMar):
self.method = methoddict['levmar']
warning("Setting optimization to " + self.method.name
+ " for confidence limit search")
# Now, set up before we call the confidence limit function
# Keep track of starting values, will need to set parameters
# back to starting values when we are done.
startpars = self.model.thawedpars
startsoftmins = self.model.thawedparmins
startsoftmaxs = self.model.thawedparmaxes
starthardmins = self.model.thawedparhardmins
starthardmaxs = self.model.thawedparhardmaxes
# If restricted to soft_limits, only send soft limits to
# method, and do not reset model limits
if (bool_cast(self.estmethod.soft_limits) is True):
starthardmins = self.model.thawedparmins
starthardmaxs = self.model.thawedparmaxes
else:
self.model.thawedparmins = starthardmins
self.model.thawedparmaxes = starthardmaxs
self.current_frozen = -1
# parnums is the list of indices of the thawed parameters
# we want to visit. For example, if there are three thawed
# parameters, and we want to derive limits for only the first
# and third, then parnums = [0,2]. We construct the list by
# comparing each parameter in parlist to the thawed model
# parameters. (In the default case, when parlist is None,
# that means get limits for all thawed parameters, so parnums
# is [0, ... , numpars - 1], if the number of thawed parameters
# is numpars.)
parnums = []
if parlist is not None:
allpars = [p for p in self.model.pars if not p.frozen]
for p in parlist:
count = 0
match = False
for par in allpars:
if p is par:
parnums.append(count)
match = True
count = count + 1
if (match == False):
raise EstErr('noparameter', p.fullname)
parnums = array(parnums)
else:
parlist = [p for p in self.model.pars if not p.frozen]
parnums = arange(len(startpars))
# If we are here, we are ready to try to derive confidence limits.
# General rule: if failure because a hard limit was hit, find
# out which parameter it was so we can tell the user.
# If a new minimum statistic was found, start over, with parameter
# values that yielded new lower statistic as the new starting point.
output = None
results = None
oldremin = -1.0
if (hasattr(self.estmethod, "remin")):
oldremin = self.estmethod.remin
try:
output = self.estmethod.compute(self._iterfit._get_callback(),
self._iterfit.fit,
self.model.thawedpars,
startsoftmins,
startsoftmaxs,
starthardmins,
starthardmaxs,
parnums,
freeze_par, thaw_par,
report_progress, get_par_name)
except EstNewMin, e:
# If maximum number of refits has occurred, don't
# try to reminimize again.
if (hasattr(self.estmethod, "maxfits") and
not(self.refits < self.estmethod.maxfits-1)):
self.refits = 0
thaw_par(self.current_frozen)
self.model.thawedpars = startpars
self.model.thawedparmins = startsoftmins
self.model.thawedparmaxes = startsoftmaxs
self.method = oldmethod
if (hasattr(self.estmethod, "remin")):
self.estmethod.remin = -1.0
warning("Maximum number of reminimizations reached")
# First report results of new fit, then call
# compute limits for those new best-fit parameters
for p in parlist:
p.frozen = False
self.current_frozen = -1
if e.args != ():
self.model.thawedpars = e.args[0]
self.model.thawedparmins = startsoftmins
self.model.thawedparmaxes = startsoftmaxs
results = self.fit()
self.refits = self.refits + 1
warning("New minimum statistic found while computing confidence limits")
warning("New best-fit parameters:\n" + results.format())
# Now, recompute errors for new best-fit parameters
results = self.est_errors(methoddict, parlist)
self.model.thawedparmins = startsoftmins
self.model.thawedparmaxes = startsoftmaxs
self.method = oldmethod
if (hasattr(self.estmethod, "remin")):
self.estmethod.remin = oldremin
return results
def calc(self, fit, par0, par1, methoddict=None):
self.title='Region-Projection'
Confidence2D.calc(self, fit, par0, par1)
if par0.frozen:
raise ConfidenceErr('frozen', par0.fullname, 'region projection')
if par1.frozen:
raise ConfidenceErr('frozen', par1.fullname, 'region projection')
thawed = [i for i in fit.model.pars if not i.frozen]
if par0 not in thawed:
raise ConfidenceErr('thawed', par0.fullname, fit.model.name)
if par1 not in thawed:
raise ConfidenceErr('thawed', par1.fullname, fit.model.name)
# If "fast" option enabled, set fitting method to
# lmdif if stat is chi-squared,
# else set to neldermead
# If current method is not LM or NM, warn it is not a good
# method for estimating parameter limits.
if type(fit.method) not in (NelderMead, LevMar):
warning(fit.method.name + " is inappropriate for confidence " +
"limit estimation")
oldfitmethod = fit.method
if (bool_cast(self.fast) is True and methoddict is not None):
if (isinstance(fit.stat, Likelihood)):
if (type(fit.method) is not NelderMead):
fit.method = methoddict['neldermead']
warning("Setting optimization to " + fit.method.name
+ " for region projection plot")
else:
if (type(fit.method) is not LevMar):
fit.method = methoddict['levmar']
warning("Setting optimization to " + fit.method.name
+ " for region projection plot")
def eval_proj(pars):
for ii in [0,1]:
if self.log[ii]:
pars[ii] = numpy.power(10, pars[ii])
(par0.val, par1.val) = pars
if len(thawed) > 2:
r = fit.fit()
return r.statval
return fit.calc_stat()
oldpars = fit.model.thawedpars
try:
fit.model.startup()
# store the class methods for startup and teardown
# these calls are unnecessary for every fit
startup = fit.model.startup
fit.model.startup = lambda : None
teardown = fit.model.teardown
fit.model.teardown = lambda : None
grid = self._region_init(fit, par0, par1)
par0.freeze()
par1.freeze()
self.y = numpy.asarray(parallel_map(eval_proj, grid,
self.numcores))
finally:
# Set back data after we changed it
par0.thaw()
par1.thaw()
fit.model.startup = startup
fit.model.teardown = teardown
fit.model.teardown()
fit.model.thawedpars = oldpars
fit.method = oldfitmethod
