python 求取数据包络线
时间: 2023-08-11 21:41:19 浏览: 145
您可以使用Python中的SciPy库来进行数据包络线的求取。具体步骤如下:
1.导入所需的库:
```python
import numpy as np
from scipy.signal import find_peaks, peak_widths
```
2.生成示例数据:
```python
x = np.linspace(0, 10*np.pi, 1000)
y = np.sin(x) + 0.5*np.sin(3*x) + 0.2*np.sin(10*x)
```
3.使用`find_peaks`函数找到峰值:
```python
peaks, _ = find_peaks(y)
```
4.使用`peak_widths`函数计算峰值的宽度:
```python
widths, _, _, _ = peak_widths(y, peaks)
```
5.使用`np.interp`函数对数据进行插值,得到数据包络线:
```python
envelope = np.interp(x, x[peaks], widths)
```
完整代码示例:
```python
import numpy as np
from scipy.signal import find_peaks, peak_widths
# 生成示例数据
x = np.linspace(0, 10*np.pi, 1000)
y = np.sin(x) + 0.5*np.sin(3*x) + 0.2*np.sin(10*x)
# 找到峰值
peaks, _ = find_peaks(y)
# 计算峰值宽度
widths, _, _, _ = peak_widths(y, peaks)
# 计算数据包络线
envelope = np.interp(x, x[peaks], widths)
# 绘制结果
import matplotlib.pyplot as plt
plt.plot(x, y, label='Signal')
plt.plot(x, envelope, label='Envelope')
plt.legend()
plt.show()
```