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Added method second_deriv, set standard case for first deriv to symmetric

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Fabian Joswig 2021-05-28 19:01:52 +02:00
parent c07f0629fa
commit 5bd0fae19e
1 changed files with 14 additions and 1 deletions
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15
pyerrors/correlators.py
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@ -173,7 +173,7 @@ class Corr:
sp_vec = sp_vec/np.sqrt(sp_vec@sp_vec)
return sp_vec
def deriv(self, symmetric=False): #Defaults to forward derivative f'(t)=f(t+1)-f(t)
def deriv(self, symmetric=True): #Defaults to forward symmetric derivative
if not symmetric:
newcontent = []
for t in range(self.T - 1):
@ -195,6 +195,19 @@ class Corr:
raise Exception("Derivative is undefined at all timeslices")
return Corr(newcontent, padding_back=1, padding_front=1)
def second_deriv(self):
newcontent = []
for t in range(1, self.T-1):
if (self.content[t-1] is None) or (self.content[t+1] is None):
newcontent.append(None)
else:
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)
#effective mass at every timeslice
def m_eff(self, periodic=False):
if self.N != 1: