title: load MIT-BIH Arrhythmia Database in python
body: <p>what is the best file format to use and how can I load the database correctly and plot sgnals in python 
  I am using a .dat file from <a href="https://physionet.org/physiobank/database/mitdb/" rel="nofollow noreferrer">https://physionet.org/physiobank/database/mitdb/</a>
  I used these code </p>
  
  <pre><code>import numpy as np 
  import matplotlib.pyplot as plt 
  data = np.genfromtxt('100.dat',delimiter=',')
  print(data)
  </code></pre>
  
  <p>and I got this error : </p>
  
  <p>*line 1867, in genfromtxt
      raise ValueError(errmsg)</p>
  
  <p>ValueError: Some errors were detected !
      Line #3 (got 2 columns instead of 1)
      Line #6 (got 4 columns instead of 1)
      Line #9 (got 3 columns instead of 1)
      Line #11 (got 3 columns instead of 1)
      Line #12 (got 2 columns instead of 1)
      Line #16 (got 3 columns instead of 1)
      Line #17 (got 2 columns instead of 1)
      Line #18 (got 3 columns instead of 1)
      Line #20 (got 2 columns instead of 1)
      Line #23 (got 2 columns instead of 1)
      Line #27 (got 2 columns instead of 1)
      Line #36 (got 2 columns instead of 1)
      Line #37 (got 2 columns instead of 1)
      Line #66 (got 2 columns instead of 1)
      Line #67 (got 2 columns instead of 1)
      Line #100 (got 2 columns instead of 1)
      Line #105 (got 2 columns instead of 1)
      Line #106 (got 2 columns instead of 1)
      Line #118 (got 2 columns instead of 1)
      Line #120 (got 5 columns instead of 1)
      Line #122 (got 3 columns instead of 1)
      Line #123 (got 4 columns instead of 1)
      Line #125 (got 2 columns instead of 1)
      Line #126 (got 2 columns instead of 1)
      Line #127 (got 3 columns instead of 1)
      Line #128 (got 2 columns instead of 1)
      Line #134 (got 2 columns instead of 1)
      Line #135 (got 2 columns instead of 1)
      Line #137 (got 2 columns instead of 1)
      Line #141 (got 3 columns instead of 1)
      Line #143 (got 3 columns instead of 1)
      Line #146 (got 2 columns instead of 1)
      Line #147 (got 2 columns instead of 1)
      Line #148 (got 2 columns instead of 1)
      Line #149 (got 2 columns instead of 1)
      Line #152 (got 3 columns instead of 1)
      Line #154 (got 2 columns instead of 1)
      Line #156 (got 4 columns instead of 1)
      Line #162 (got 2 columns instead of 1)
      Line #163 (got 2 columns instead of 1)
      Line #167 (got 3 columns instead of 1)
      Line #168 (got 2 columns instead of 1)
      Line #174 (got 2 columns instead of 1)
      Line #175 (got 2 columns instead of 1)
      Line #176 (got 3 columns instead of 1)
      Line #177 (got 2 columns instead of 1)
      Line #179 (got 2 columns instead of 1)
      Line #186 (got 2 columns instead of 1)
      Line #187 (got 3 columns instead of 1)
      Line #188 (got 2 columns instead of 1)
      Line #189 (got 3 columns instead of 1)
      Line #191 (got 2 columns instead of 1)
      Line #193 (got 2 columns instead of 1)
      Line #196 (got 2 columns instead of 1)
      Line #199 (got 2 columns instead of 1)
      Line #202 (got 2 columns instead of 1)
      Line #203 (got 2 columns instead of 1)
      Line #204 (got 2 columns instead of 1)
      Line #209 (got 4 columns instead of 1)
      Line #210 (got 4 columns instead of 1)
      Line #211 (got 2 columns instead of 1)
      Line #213 (got 2 columns instead of 1)
      Line #218 (got 2 columns instead of 1)
      Line #222 (got 2 columns instead of 1)
      Line #223 (got 3 columns instead of 1)
      Line #228 (got 2 columns instead of 1)
      Line #236 (got 2 columns instead of 1)
      Line #240 (got 2 columns instead of 1)
      Line #241 (got 2 columns instead of 1)
      Line #244 (got 3 columns instead of 1)
      Line #246 (got 2 columns instead of 1)
      Line #255 (got 2 columns instead of 1)
      Line #257 (got 2 columns instead of 1)
      Line #268 (got 2 columns instead of 1)
      Line #269 (got 2 columns instead of 1)
      Line #271 (got 2 columns instead of 1)
      Line #273 (got 4 columns instead of 1)
      Line #280 (got 2 columns instead of 1)
      Line #281 (got 2 columns instead of 1)
      Line #291 (got 2 columns instead of 1)
      Line #323 (got 2 columns instead of 1)
      Line #325 (got 2 columns instead of 1)
      Line #334 (got 2 columns instead of 1)
      Line #340 (got 2 columns instead of 1)
      Line #341 (got 2 columns instead of 1)
      Line #342 (got 2 columns instead of 1)
      Line #364 (got 2 columns instead of 1)
      Line #372 (got 3 columns instead of 1)
      Line #375 (got 2 columns instead of 1)
      Line #378 (got 6 columns instead of 1)*</p>