Question

我非常喜欢编码。对于我的课程，我需要完成一项练习，其中必须对睡眠阶段进行分类。代码如下：

def classify_epoch(epoch,rate):
    """
    This function returns a sleep stage classification (integers: 1 for NREM
    stage 1, 2 for NREM stage 2, and 3 for NREM stage 3/4) given an epoch of 
    EEG and a sampling rate.
    """

    stage = []


    for i in epoch:

          Pxx, freqs = m.psd(i, NFFT = 512, Fs = srate)
          Pxxs=np.cumsum(Pxx)
          Pxxn=Pxx/Pxxs
          if Pxxn+1 <= Pxxn:
           stage.append(1)

          elif (Pxxn+1 > 1.15*Pxxn) and (Pxxn+1 < 1.4*Pxxn):
            stage.append(2)
          else:
            stage.append(3)       


    return stage

但是当代码执行时，python给了我一个错误：

Traceback (most recent call last):
  File "<ipython-input-123-3b84c0546ebf>", line 1, in <module>
    runfile('C:/Users/Olga/Documents/Python Scripts/problem_set4/problem_set4.py', wdir='C:/Users/Olga/Documents/Python Scripts/problem_set4')
  File "C:\Users\Olga\Anaconda\lib\site-packages\spyderlib\widgets\externalshell\sitecustomize.py", line 580, in runfile
    execfile(filename, namespace)
  File "C:/Users/Olga/Documents/Python Scripts/problem_set4/problem_set4.py", line 218, in <module>
    test_examples(examples, srate)
  File "C:/Users/Olga/Documents/Python Scripts/problem_set4/problem_set4.py", line 176, in test_examples
    c[j,i/bin_size] = classify_epoch(examples[j,range(i,i+bin_size)],srate)
  File "C:/Users/Olga/Documents/Python Scripts/problem_set4/problem_set4.py", line 104, in classify_epoch
    Pxx, freqs = m.psd(i, NFFT = 512, Fs = srate)
  File "C:\Users\Olga\Anaconda\lib\site-packages\matplotlib\mlab.py", line 959, in psd
    sides=sides, scale_by_freq=scale_by_freq)
  File "C:\Users\Olga\Anaconda\lib\site-packages\matplotlib\mlab.py", line 1022, in csd
    mode='psd')
  File "C:\Users\Olga\Anaconda\lib\site-packages\matplotlib\mlab.py", line 700, in _spectral_helper
    if len(x) < NFFT:
TypeError: len() of unsized object

我正在努力寻找此错误的来源。请帮我！非常感谢你提前！

Answer 1

我自己设法找到了错误：psd函数应该放在for循环外面，因为只能为一个值做FFT。

TypeError：psd python中未大小对象的len（）

1 个答案: