我在使用 scipy.opt.curve_fit
拟合只有一个参数的曲线时遇到问题:
import scipy.optimize as opt
import numpy as np
def func(T):
return 76.881324*np.exp((-L)/(8.314*T))
best_params, cov_matrix = opt.curve_fit(func, xdata = x, ydata = y, p0=[])
我有值数组,x
(下面等式中的 T)和 y
(P),我试图将它们拟合到等式中
但它似乎希望 func()
有多个参数。我该如何解决这个问题?
最佳答案
这是一个图形化的 Python 拟合器,使用您的方程和一些测试数据。将示例数据替换为您自己的数据,您就应该完成了。
import numpy, scipy, matplotlib
import matplotlib.pyplot as plt
from scipy.optimize import curve_fit
xData = numpy.array([1.1, 2.2, 3.3, 4.4, 5.0, 6.6, 7.7])
yData = numpy.array([1.1, 20.2, 30.3, 60.4, 50.0, 60.6, 70.7])
def func(T, L):
return 76.881324*numpy.exp((-L)/(8.314*T))
# all "1.0" is the same as the scipy defaults
initialParameters = numpy.array([1.0])
# curve fit the test data
fittedParameters, pcov = curve_fit(func, xData, yData, initialParameters)
modelPredictions = func(xData, *fittedParameters)
absError = modelPredictions - yData
SE = numpy.square(absError) # squared errors
MSE = numpy.mean(SE) # mean squared errors
RMSE = numpy.sqrt(MSE) # Root Mean Squared Error, RMSE
Rsquared = 1.0 - (numpy.var(absError) / numpy.var(yData))
print('Parameters:', fittedParameters)
print('RMSE:', RMSE)
print('R-squared:', Rsquared)
print()
##########################################################
# graphics output section
def ModelAndScatterPlot(graphWidth, graphHeight):
f = plt.figure(figsize=(graphWidth/100.0, graphHeight/100.0), dpi=100)
axes = f.add_subplot(111)
# first the raw data as a scatter plot
axes.plot(xData, yData, 'D')
# create data for the fitted equation plot
xModel = numpy.linspace(min(xData), max(xData))
yModel = func(xModel, *fittedParameters)
# now the model as a line plot
axes.plot(xModel, yModel)
axes.set_xlabel('X Data') # X axis data label
axes.set_ylabel('Y Data') # Y axis data label
plt.show()
plt.close('all') # clean up after using pyplot
graphWidth = 800
graphHeight = 600
ModelAndScatterPlot(graphWidth, graphHeight)
关于python - opt.curve_fit 只有一个参数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59833030/