docs: def convert_mfile(mfile, outfile=None):
      """
      Convert a Matlab m-file into a Matlab notebook in ipynb format
  
      Parameters
      ----------
      mfile : string
          Full path to a matlab m file to convert
  
      outfile : string (optional)
          Full path to the output ipynb file
  
      """
      lines = mfile_to_lines(mfile)
      nb = lines_to_notebook(lines)
      if outfile is None:
          outfile = mfile.split('.m')[0] + '.ipynb'
      with open(outfile, 'w') as fid:
          nbwrite(nb, fid)