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python - Python 中的多峰数据拟合

转载 作者:太空宇宙 更新时间:2023-11-04 11:14:30 27 4
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import numpy as np
from sympy.physics.wigner import wigner_6j
import matplotlib.pyplot as plt
xr=np.arange(0,33)
[Jo, Ju, I, Ao, Au]=[4.5, 4.5, 2.5,674.4,929]
Ao=Ao*0.00003335640954804
Au=Au*0.00003335640954804
xr1=100000000/np.array(xr)
positions=xr1
centroid = positions.mean(axis=0)
newo=0.005+100000000/4715.2274
Fo=[]
Fu=[]
new=[]
In=[]
Fomax=Jo+I
Fomin=abs(Jo-I)
Fumax=Ju+I
Fumin=abs(Ju-I)
no=int(2*min(Jo,I)+1)
for i in range(0,no):
Fo.append(Fomax-i)
nu=int(2*min(Ju,I)+1)
for i in range(0,nu):
Fu.append(Fumax-i)
for i in range(0,no):
for j in range(0,nu):
if abs(Fo[i]-Fu[j])<2:
new.append(newo+(Ao/2)*(Fo[i]*(Fo[i]+1)-Jo*(Jo+1)-I*(I+1))-(Au/2)*(Fu[j]*(Fu[j]+1)-Ju*(Ju+1)-I*(I+1)))
In.append((2*Fo[i]+1)*(2*Fu[j]+1)*(wigner_6j(Jo,Fo[i],I,Fu[j],Ju,1))**2/(2*I+1))
max1=np.max(In)
for i in range(0,len(new)):
for j in range(0,len(new)):
if new[i]>new[j]:
temp=new[j]
new[j]=new[i]
new[i]=temp
temp=In[j]

In[j]=In[i]
In[i]=temp
zr=[]
sigma=0.031
x2=[]
y2=[]
y2r=[]
for i in range(0, len(new)):
mew=new[i]
for j in range(-100,100):
c=mew+j/1000
cc=In[i]*(1/(sigma*(44/7)**0.5))*np.exp(-1*((c-mew)/sigma)**2)
y2.append(cc)
x2.append(c)
max2=np.max(y2)
for i in range(0,len(new)):
In[i]=In[i]/max1
for i in range(0,len(y2)):
y2[i]=y2[i]/max2
for i in range(0,len(y2)):
y2r.append(y2[i])
for i in range(0,15):
a=5
print(centroid)
fig, ax = plt.subplots()
plt.plot(x2, y2r,label="fitted data")
plt.legend()
plt.show()

我有这段代码,它产生了多个峰值。图 1 显示了具有多个相互重叠的峰的数据,但我试图通过使用这些重叠的峰来实现只有一条曲线,如图 2 中的“红”线所示。 This  image is formed by running the program .

但问题是必须像最后一张图片所示那样拟合一条线 Red line is drawn by hand i want it to drawn by python

最佳答案

我希望我现在能回答这个问题。如果我没看错,问题基本上是 x 值不同。最重要的是,所有内容都合并到一个列表中。为了处理这个问题,我将 print(centroid) 之后的所有内容都更改为

from scipy.interpolate import interp1d

def partition( inList, n ):
return zip( *[ iter( inList ) ] * n )

xSplit = partition( x2, 200 ) ###manually set to 200 as data is created with range(-100,100)
ySplit = partition( y2r, 200 )
allx = sorted( x2 )
ally = np.zeros( len( allx ), np.float )
funcDict = dict()
for i in range( len( xSplit ) ):
funcDict[i] = interp1d( xSplit[i], ySplit[i], kind='linear', bounds_error=False, fill_value=0 )
for i in range( len( xSplit ) ):
ally += funcDict[i]( allx )

fig, ax = plt.subplots()
ax.plot( allx, ally, linewidth=2 )
for col1, col2 in zip( xSplit, ySplit ):
plt.plot( col1, col2, linestyle='--' )
plt.legend()
plt.show()

这给了你

sum vie interpolation

这是总和,但使用数据插值。是这个主意吗?

编辑似乎 OP 需要更多的信封而不是总和。 James Phillips 给出了解决方案。甚至可以使用 numpy 更改来缩短它

ally += funcDict[i]( allx )

ally = np.maximum(ally, funcDict[i]( allx ) )

然后给出

enter image description here

关于python - Python 中的多峰数据拟合,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/57346857/

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