使用odeint求解具有快速振荡的不同方程
我已经编写了此代码来求解方程,我知道此功能的行为具有非常快的振荡,当我运行时,它会为某些“ m [x]”和某些“ t” s的虚假值,带有此错误:
c:\ users \ dani \ anaconda3 \ lib \ lib \ site-packages \ scipy \ intemate \ odepack.py:247:odeintwarning:在此呼叫上完成的多余工作(也许是错误的dfun类型)。使用full_output = 1运行以获取定量信息。 WARNINGS.WARN(WARNNING_MSG,ODEINTWARNING)
我不知道有什么问题。 如何获得正确的结果?还是至少尽可能准确?还是我应该以另一种形式重写代码? 谢谢。
import scipy as sio
import numpy as np
import mpmath as mp
import scipy.integrate as spi
import matplotlib.pyplot as plt
import time
from scipy.integrate import quad
initial_value=np.logspace(24,27,100)
t=np.logspace(-20,6,100)
m=np.logspace(0,6,100)
start_time=time.perf_counter()
phi_m={}
phi_m_prime={}
phi=[]
phi_prime=[]
j=0
i=np.pi*2.435*initial_value[0]
while i<(np.pi*(2.435*10**(27))):
i=np.pi*2.435*initial_value[j]
phi=[]
phi_prime=[]
for x in range (len(m)):
def dzdt(z,T):
return [z[1], -3*1.4441*(10**(-6))*m[x]*np.sqrt(0.69)*(mp.coth(1.5*np.sqrt(0.69)*(10**(-6))*1.4441*m[x]*T))*z[1] - z[0]]
z0 = [i,0]
ts = t/m[x]
zs = spi.odeint(dzdt, z0, ts)
phi.append(zs[99,0])
phi_prime.append(zs[99,1])
phi_m[j]=phi
phi_m_prime[j]=phi_prime
j+=1
end_time=time.perf_counter()
print(end_time-start_time,"seconds")
I have wrote this code to solve an equation , I know the behavior of this function has very rapid oscillations, when I RUN it gives bogus values for some "m[x]" and some "t"'s, with this error:
C:\Users\dani\anaconda3\lib\site-packages\scipy\integrate\odepack.py:247: ODEintWarning: Excess work done on this call (perhaps wrong Dfun type). Run with full_output = 1 to get quantitative information.
warnings.warn(warning_msg, ODEintWarning)
I don't know what is the problem.
how can I get correct results? or at least as accurate as possible? or maybe I should rewrite the code in another form?
thank you.
import scipy as sio
import numpy as np
import mpmath as mp
import scipy.integrate as spi
import matplotlib.pyplot as plt
import time
from scipy.integrate import quad
initial_value=np.logspace(24,27,100)
t=np.logspace(-20,6,100)
m=np.logspace(0,6,100)
start_time=time.perf_counter()
phi_m={}
phi_m_prime={}
phi=[]
phi_prime=[]
j=0
i=np.pi*2.435*initial_value[0]
while i<(np.pi*(2.435*10**(27))):
i=np.pi*2.435*initial_value[j]
phi=[]
phi_prime=[]
for x in range (len(m)):
def dzdt(z,T):
return [z[1], -3*1.4441*(10**(-6))*m[x]*np.sqrt(0.69)*(mp.coth(1.5*np.sqrt(0.69)*(10**(-6))*1.4441*m[x]*T))*z[1] - z[0]]
z0 = [i,0]
ts = t/m[x]
zs = spi.odeint(dzdt, z0, ts)
phi.append(zs[99,0])
phi_prime.append(zs[99,1])
phi_m[j]=phi
phi_m_prime[j]=phi_prime
j+=1
end_time=time.perf_counter()
print(end_time-start_time,"seconds")
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