我正在拟合一条具有三个点的非常简单的曲线。使用minimumsq方法，遵循所有规则。但是我还是出错了。我不明白。谁能帮忙。非常感谢
import numpy as np
import matplotlib.pyplot as plt
from scipy.optimize import leastsq
x = np.array([2.0,30.2,15.0])
y = np.array([45.0,56.2,30.0])
print(x)
print(y)
# model
def t(x,a,b,c):
return a*x**2 + b*x + c
#residual fucntion
def residual_t(x,y,a,b,c):
return y-t(x,a,b,c)
#initial parameters
g0 = np.array([0.0,0.0,0.0])
#leastsq method
coeffs, cov = leastsq(residual_t, g0, args=(x,y))
plt.plot(x,t(x,*coeffs),'r')
plt.plot(x,y,'b')
plt.show()
#finding out Rsquared and Radj squared value
absError = residual_t(y,x,*coeffs)
se = np.square(absError) # squared errors
Rsquared = 1.0 - (np.var(absError) / np.var(y))
n = len(x)
k = len(coeffs)
Radj_sq = (1-((1-Rsquared)/(n-1)))/(n-k-1)
print (f'Rsquared value: {Rsquared} adjusted R saquared value: {Radj_sq}')
TypeError：residual_t（）缺少2个必需的位置参数：“ b”和“ c”
为什么？ coeffs已经是包含a，b，c的最佳it值的数组。 coeffs也显示未定义，而residual_t也显示问题。您能帮我理解吗？
答案 0 :(得分：1)
复制并粘贴您的代码（包括 Child Comp:
import Picker from 'react-giphy-component'
import React, { Component, PropTypes } from 'react'
class AddGif extends Component {
log (gif) {
console.log(gif.original.mp4)
}
returnedGifObject = gif ;
render () {
return (
<div>
{/* <button></button> */}
<Picker onSelected={this.log.bind(this)} />
</div>
)
}
}
export default AddGif;
parent element
class PostBox extends Component {
constructor(props){
super(props)
this.state = {
title: null,
postBody: null,
giphyUrl: null,
displayGifPicker: false
}
}
getGifState = (selectedUrl) => {
this.setState({ giphyUrl: selectedUrl})
}
render () {
const {title, postBody} = this.state
const displayGifPicker = this.state.displayGifPicker
return (
<Grid item xl={8}>
{/* <Card className={classes.card} style={mt4}> */}
<Card style={mt4}>
<CardContent >
<PostInput onChange={this.handleInputChange} onSubmit={this.handleSubmit}/>
{displayGifPicker ? (<AddGif selectedGif = {this.getGifState} />) : (<Button size="small" onClick={this.displayGifPicker} ><button>Add Gif</button></Button>)}
<CardActions>
{/* <Button size="small">Submit VH5</Button> */}
</CardActions>
</CardContent>
</Card>
</Grid>
)
}
}
更改），我得到
*coeffs那是在1135:~/mypy$ python3 stack58206395.py
[ 2. 30.2 15. ]
[45. 56.2 30. ]
Traceback (most recent call last):
File "stack58206395.py", line 24, in <module>
coeffs, cov = leastsq(residual_t, g0, args=(x,y))
File "/usr/local/lib/python3.6/dist-packages/scipy/optimize/minpack.py", line 383, in leastsq
shape, dtype = _check_func('leastsq', 'func', func, x0, args, n)
File "/usr/local/lib/python3.6/dist-packages/scipy/optimize/minpack.py", line 26, in _check_func
res = atleast_1d(thefunc(*((x0[:numinputs],) + args)))
TypeError: residual_t() missing 2 required positional arguments: 'b' and 'c'
调用中使用residual_t的错误。
如果我添加
leastsq在residual_t(g0, x, y)
定义之后，我得到了相同的错误：
g0因此，您需要定义1136:~/mypy$ python3 stack58206395.py
[ 2. 30.2 15. ]
[45. 56.2 30. ]
Traceback (most recent call last):
File "stack58206395.py", line 23, in <module>
residual_t(g0, x, y)
TypeError: residual_t() missing 2 required positional arguments: 'b' and 'c'
来处理这样的呼叫。我不会猜测您真正想要的是什么，所以我将把修补程序留给您。
请记住，residual_t将与residual_t元组结合的x0一起调用。这是args函数的典型用法。如有必要，请查看文档。
将函数定义为：
scipy.optimize运行没有错误。