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feat: backward derivative implemented, additional tests for deriv

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This commit is contained in:
Fabian Joswig 2022-01-31 12:10:38 +00:00
parent 8165479846
commit a729def937
2 changed files with 25 additions and 1 deletions
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12
pyerrors/correlators.py
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@ -467,7 +467,7 @@ class Corr:
----------
variant : str
decides which definition of the finite differences derivative is used.
Available choice: symmetric, forward, improved, default: symmetric
Available choice: symmetric, forward, backward, improved, default: symmetric
"""
if variant == "symmetric":
newcontent = []
@ -489,6 +489,16 @@ class Corr:
if(all([x is None for x in newcontent])):
raise Exception("Derivative is undefined at all timeslices")
return Corr(newcontent, padding=[0, 1])
elif variant == "backward":
newcontent = []
for t in range(1, self.T):
if (self.content[t - 1] is None) or (self.content[t] is None):
newcontent.append(None)
else:
newcontent.append(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=[1, 0])
elif variant == "improved":
newcontent = []
for t in range(2, self.T - 2):