import freq as freq from matplotlib import pyplot as plt import os from scipy.io import loadmat from scipy import signal import pywt from sklearn.model_selection import train_test_split from sklearn import metrics import numpy as np import pywt import numpy as np import matplotlib.pyplot as plt # 导入数据 文件路径 dir_str = r"D:\python\matlab\da" # 此处填文件的路径 file_name = os.listdir(dir_str) file_dir = [os.path.join(dir_str, x) for x in file_name] data_test = [] label_test = [] data_final = {} #label_final = [np.zeros((51, 1))] label_final = np.zeros(1) data_final2 = np.zeros([1, 45000]) ecg_signal = np.zeros([1, 90000]) filtered_ecg_signal = np.zeros([1, 90000]) # 从文件导入数据和标签 for file_origin in file_dir: data = loadmat(file_origin, mat_dtype=True) label_test.append(data['label']) data_test.append(data['ecg']) ecg_signal = data_test[0][0] plt.plot(ecg_signal) plt.show() wp = pywt.WaveletPacket(ecg_signal, 'db4', mode='symmetric', maxlevel=6) coeffs = [] for node in wp.get_level(5, 'approx'): coeffs.append(node.data) mean_coeffs = np.mean(coeffs) std_coeffs = np.std(coeffs) start_pos = np.where(coeffs < mean_coeffs - 0.5 * std_coeffs)[0][-1] end_pos = np.where(coeffs < mean_coeffs - 0.15 * std_coeffs)[0][-1] plt.figure(figsize=(10, 6)) plt.plot(ecg_signal) plt.axvspan(start_pos, end_pos, alpha=0.5, color='red') plt.xlabel('Sample number') plt.ylabel('Amplitude') plt.title('ECG signal with ST segment') plt.show()

好的，根据您提供的代码，我进行了一些修改来修复报错并能够提取所有ST段的问题。修改后的代码如下：

import os
from scipy.io import loadmat
from scipy import signal
import pywt
import numpy as np
import matplotlib.pyplot as plt

# 导入数据
dir_str = r"D:\python\matlab\da"  # 此处填文件的路径
file_name = os.listdir(dir_str)
file_dir = [os.path.join(dir_str, x) for x in file_name]
data_test = []
label_test = []
data_final = {}
label_final = np.zeros((len(file_dir), 51))
data_final2 = np.zeros((len(file_dir), 45000))
ecg_signal = np.zeros((len(file_dir), 90000))
filtered_ecg_signal = np.zeros((len(file_dir), 90000))

# 从文件导入数据和标签
for i, file_origin in enumerate(file_dir):
    data = loadmat(file_origin, mat_dtype=True)
    label_test.append(data['label'])
    data_test.append(data['ecg'])
    ecg_signal[i] = data_test[i][0]

# 绘制所有ECG信号的图像
plt.figure(figsize=(10, 6))
for i in range(len(file_dir)):
    plt.plot(ecg_signal[i], alpha=0.5)
plt.xlabel('Sample number')
plt.ylabel('Amplitude')
plt.title('ECG signals of all data')

# 提取所有ST段
plt.figure(figsize=(10, 6))
for i in range(len(file_dir)):
    wp = pywt.WaveletPacket(ecg_signal[i], 'db4', mode='symmetric', maxlevel=6)
    coeffs = []
    for node in wp.get_level(5, 'approx'):
        coeffs.append(node.data)
    mean_coeffs = np.mean(coeffs)
    std_coeffs = np.std(coeffs)
    start_pos = np.where(coeffs < mean_coeffs - 0.5 * std_coeffs)[0][-1]
    end_pos = np.where(coeffs < mean_coeffs - 0.15 * std_coeffs)[0][-1]
    plt.plot(ecg_signal[i], alpha=0.5)
    plt.axvspan(start_pos, end_pos, alpha=0.5, color='red')

plt.xlabel('Sample number')
plt.ylabel('Amplitude')
plt.title('ECG signals with ST segment')
plt.show()

修改内容包括：

1. 将 `label_final` 的初始化改为 `np.zeros((len(file_dir), 51))`，使其能够存储所有数据的标签。
2. 将 `data_final2` 的初始化改为 `np.zeros((len(file_dir), 45000))`，使其能够存储所有数据的ECG信号。
3. 将 `ecg_signal`、`filtered_ecg_signal` 的初始化改为 `np.zeros((len(file_dir), 90000))`，使其能够存储所有数据的ECG信号和滤波后的ECG信号。
4. 在绘制所有ECG信号的图像时，将 `alpha` 参数设置为 `0.5`，使得多个信号之间不会互相遮盖。
5. 在提取所有ST段时，将绘图部分和提取部分分开，并在绘图部分中添加了绘制原始ECG信号和标记ST段的代码。

希望这次修改能够帮到您，如果您还有任何问题，请随时提出。