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JanNeuendorf 2022-01-18 16:21:59 +01:00 • committed by GitHub
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pyerrors/correlators.py
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@ -19,46 +19,55 @@ class Corr:
to iterate over all timeslices for every operation. This is especially true, when dealing with smearing matrices.
The correlator can have two types of content: An Obs at every timeslice OR a GEVP
smearing matrix at every timeslice. Other dependency (eg. spacial) are not supported.
smearing matrix at every timeslice. Other dependency (eg. spatial) are not supported.
"""
def __init__(self, data_input, padding_front=0, padding_back=0, prange=None):
# All data_input should be a list of things at different timeslices. This needs to be verified
def __init__(self, data_input, padding=[0, 0], prange=None):
""" Initialize a Corr object.
Parameters
----------
data_input : list
list of Obs or list of arrays of Obs.
padding : list, optional
List with two entries where the first labels the padding
at the front of the correlator and the second the padding
at the back.
prange : list, optional
List containing the first and last timeslice of the plateau
region indentified for this correlator.
"""
if not isinstance(data_input, list):
raise TypeError('Corr__init__ expects a list of timeslices.')
# data_input can have multiple shapes. The simplest one is a list of Obs.
# We check, if this is the case
if all([(isinstance(item, Obs) or isinstance(item, CObs)) for item in data_input]):
self.content = [np.asarray([item]) for item in data_input]
# Wrapping the Obs in an array ensures that the data structure is consistent with smearing matrices.
self.N = 1 # number of smearings
# data_input in the form [np.array(Obs,NxN)]
self.content = [np.asarray([item]) for item in data_input]
self.N = 1
elif all([isinstance(item, np.ndarray) or item is None for item in data_input]) and any([isinstance(item, np.ndarray) for item in data_input]):
self.content = data_input
noNull = [a for a in self.content if not (a is None)] # To check if the matrices are correct for all undefined elements
self.N = noNull[0].shape[0]
# The checks are now identical to the case above
if self.N > 1 and noNull[0].shape[0] != noNull[0].shape[1]:
raise Exception("Smearing matrices are not NxN")
if (not all([item.shape == noNull[0].shape for item in noNull])):
raise Exception("Items in data_input are not of identical shape." + str(noNull))
else: # In case its a list of something else.
else:
raise Exception("data_input contains item of wrong type")
self.tag = None
# We now apply some padding to our list. In case that our list represents a correlator of length T but is not defined at every value.
# An undefined timeslice is represented by the None object
self.content = [None] * padding_front + self.content + [None] * padding_back
self.T = len(self.content) # for convenience: will be used a lot
self.content = [None] * padding[0] + self.content + [None] * padding[1]
self.T = len(self.content)
# The attribute "range" [start,end] marks a range of two timeslices.
# This is useful for keeping track of plateaus and fitranges.
# The range can be inherited from other Corrs, if the operation should not alter a chosen range eg. multiplication with a constant.
self.prange = prange
self.gamma_method()
@ -406,7 +415,7 @@ class Corr:
newcontent.append(self.content[t + 1] - self.content[t])
if(all([x is None for x in newcontent])):
raise Exception("Derivative is undefined at all timeslices")
return Corr(newcontent, padding_back=1)
return Corr(newcontent, padding=[0, 1])
if symmetric:
newcontent = []
for t in range(1, self.T - 1):
@ -416,7 +425,7 @@ class Corr:
newcontent.append(0.5 * (self.content[t + 1] - self.content[t - 1]))
if(all([x is None for x in newcontent])):
raise Exception('Derivative is undefined at all timeslices')
return Corr(newcontent, padding_back=1, padding_front=1)
return Corr(newcontent, padding=[1, 1])
def second_deriv(self):
"""Return the second derivative of the correlator with respect to x0."""
@ -428,7 +437,7 @@ class Corr:
newcontent.append((self.content[t + 1] - 2 * self.content[t] + self.content[t - 1]))
if(all([x is None for x in newcontent])):
raise Exception("Derivative is undefined at all timeslices")
return Corr(newcontent, padding_back=1, padding_front=1)
return Corr(newcontent, padding=[1, 1])
def m_eff(self, variant='log', guess=1.0):
"""Returns the effective mass of the correlator as correlator object
@ -456,7 +465,7 @@ class Corr:
if(all([x is None for x in newcontent])):
raise Exception('m_eff is undefined at all timeslices')
return np.log(Corr(newcontent, padding_back=1))
return np.log(Corr(newcontent, padding=[0, 1]))
elif variant in ['periodic', 'cosh', 'sinh']:
if variant in ['periodic', 'cosh']:
@ -479,7 +488,7 @@ class Corr:
if(all([x is None for x in newcontent])):
raise Exception('m_eff is undefined at all timeslices')
return Corr(newcontent, padding_back=1)
return Corr(newcontent, padding=[0, 1])
elif variant == 'arccosh':
newcontent = []
@ -490,7 +499,7 @@ class Corr:
newcontent.append((self.content[t + 1] + self.content[t - 1]) / (2 * self.content[t]))
if(all([x is None for x in newcontent])):
raise Exception("m_eff is undefined at all timeslices")
return np.arccosh(Corr(newcontent, padding_back=1, padding_front=1))
return np.arccosh(Corr(newcontent, padding=[1, 1]))
else:
raise Exception('Unknown variant.')