lmfit模型拟合，然后进行预测 [英] lmfit model fitting and then prediction

问题描述

我正在采用 lmfit 进行曲线拟合，并使用该拟合模型进行预测.但是，以下代码无法实现我想要的.能否请你帮忙?谢谢.

I was adopting lmfit to do a curve fitting and use that fitted model to do prediction. However, the following code did not achieve what I want. Could you please help? Thanks.

import numpy as np
from lmfit import Model

def linearModel(x, a0, a1):
    return a0+a1*x

#main code begin here
X=[1,2,4]  # data for fitting
y=[2,4,6]  # data for fitting
gmodel = Model(linearModel)  #select model      
params = gmodel.make_params(a0=1, a1=1) # initial params
result = gmodel.fit(y, params, x=X) # curve fitting
x1=[1, 2, 3] # input for prediction
a=result.eval(x)   # prediction

推荐答案

包括您实际运行的代码，获得的结果以及预期的结果总是一个好主意.

It is always a good idea to include the code you actually ran, the result you got, and the result you expected.

这里，主要问题是您遇到语法错误.其次，您应该使用numpy数组，而不是列表.第三，如文档所示(请参见 https://lmfit.github.io/lmfit-py/model.html#lmfit.model.ModelResult.eval ) result.eval()将采用 params 作为第一个参数，不是自变量.简而言之，您想将最后两行替换为

Here, the main problem is that you have a syntax error. Second, you should use numpy arrays, not lists. And third, as the docs show (see https://lmfit.github.io/lmfit-py/model.html#lmfit.model.ModelResult.eval) result.eval() would take params as the first argument, not the independent variable. In short, you want to replace your last two lines with

x1 = np.array([1, 2, 3]) # input for prediction
a = result.eval(x=x1)   # prediction

应该可以正常工作.

并且:当然，您不需要 lmfit 即可进行线性回归.;).

And: of course, you don't need lmfit to do a linear regression. ;).

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