在python中拟合曲线-拟合参数

Question

I am trying to fit a curve to my data in Python, as follows:

def func(p1,p2,p3,x):
    return p1*((p2-x)/p2)^(-p3)

And I call this function in an other function, and trying to fit:

f1 = func(p1,p2,p3,x)
popt, pcov = curve_fit(f1, T, Susceptibility) 

But Python doesn't regard p1,p2,p3 as a fitting parameter, becouse I get this error message: global name 'p1' is not defined

Answer 1

Read the docs more carefully, x is supposed to be the first parameter. Also you need to use a function as input instead of it's return value

def func(x, p1, p2, p3):
    return p1*((p2-x)/p2)^(-p3)

popt, pcov = curve_fit(func, T, Susceptibility)