text: #!/usr/bin/env python3
  
  import timeit
  import numpy
  
  
  ###############################################################################
  #                               Global variables                              #
  ###############################################################################
  
  
  # Small arrays
  xs = numpy.random.uniform(-1, 1, 6).reshape(2, 3)
  ys = numpy.random.uniform(-1, 1, 6).reshape(2, 3)
  zs = xs + 1j * ys
  m1 = [[True, False, False], [False, False, True]]
  m2 = [[True, False, True], [False, False, True]]
  nmxs = numpy.ma.array(xs, mask=m1)
  nmys = numpy.ma.array(ys, mask=m2)
  nmzs = numpy.ma.array(zs, mask=m1)
  
  # Big arrays
  xl = numpy.random.uniform(-1, 1, 100*100).reshape(100, 100)
  yl = numpy.random.uniform(-1, 1, 100*100).reshape(100, 100)
  zl = xl + 1j * yl
  maskx = xl > 0.8
  masky = yl < -0.8
  nmxl = numpy.ma.array(xl, mask=maskx)
  nmyl = numpy.ma.array(yl, mask=masky)
  nmzl = numpy.ma.array(zl, mask=maskx)
  
  
  ###############################################################################
  #                                 Functions                                   #
  ###############################################################################
  
  
  def timer(s, v='', nloop=500, nrep=3):
      units = ["s", "ms", "µs", "ns"]
      scaling = [1, 1e3, 1e6, 1e9]
      print("%s : %-50s : " % (v, s), end=' ')
      varnames = ["%ss,nm%ss,%sl,nm%sl" % tuple(x*4) for x in 'xyz']
      setup = 'from __main__ import numpy, ma, %s' % ','.join(varnames)
      Timer = timeit.Timer(stmt=s, setup=setup)
      best = min(Timer.repeat(nrep, nloop)) / nloop
      if best > 0.0:
          order = min(-int(numpy.floor(numpy.log10(best)) // 3), 3)
      else:
          order = 3
      print("%d loops, best of %d: %.*g %s per loop" % (nloop, nrep,
                                                        3,
                                                        best * scaling[order],
                                                        units[order]))
  
  
  def compare_functions_1v(func, nloop=500,
                         xs=xs, nmxs=nmxs, xl=xl, nmxl=nmxl):
      funcname = func.__name__
      print("-"*50)
      print(f'{funcname} on small arrays')
      module, data = "numpy.ma", "nmxs"
      timer("%(module)s.%(funcname)s(%(data)s)" % locals(), v="%11s" % module, nloop=nloop)
  
      print("%s on large arrays" % funcname)
      module, data = "numpy.ma", "nmxl"
      timer("%(module)s.%(funcname)s(%(data)s)" % locals(), v="%11s" % module, nloop=nloop)
      return
  
  def compare_methods(methodname, args, vars='x', nloop=500, test=True,
                      xs=xs, nmxs=nmxs, xl=xl, nmxl=nmxl):
      print("-"*50)
      print(f'{methodname} on small arrays')
      data, ver = f'nm{vars}l', 'numpy.ma'
      timer("%(data)s.%(methodname)s(%(args)s)" % locals(), v=ver, nloop=nloop)
  
      print("%s on large arrays" % methodname)
      data, ver = "nm%sl" % vars, 'numpy.ma'
      timer("%(data)s.%(methodname)s(%(args)s)" % locals(), v=ver, nloop=nloop)
      return
  
  def compare_functions_2v(func, nloop=500, test=True,
                         xs=xs, nmxs=nmxs,
                         ys=ys, nmys=nmys,
                         xl=xl, nmxl=nmxl,
                         yl=yl, nmyl=nmyl):
      funcname = func.__name__
      print("-"*50)
      print(f'{funcname} on small arrays')
      module, data = "numpy.ma", "nmxs,nmys"
      timer("%(module)s.%(funcname)s(%(data)s)" % locals(), v="%11s" % module, nloop=nloop)
  
      print(f'{funcname} on large arrays')
      module, data = "numpy.ma", "nmxl,nmyl"
      timer("%(module)s.%(funcname)s(%(data)s)" % locals(), v="%11s" % module, nloop=nloop)
      return
  
  
  if __name__ == '__main__':
      compare_functions_1v(numpy.sin)
      compare_functions_1v(numpy.log)
      compare_functions_1v(numpy.sqrt)
  
      compare_functions_2v(numpy.multiply)
      compare_functions_2v(numpy.divide)
      compare_functions_2v(numpy.power)
  
      compare_methods('ravel', '', nloop=1000)
      compare_methods('conjugate', '', 'z', nloop=1000)
      compare_methods('transpose', '', nloop=1000)
      compare_methods('compressed', '', nloop=1000)
      compare_methods('__getitem__', '0', nloop=1000)
      compare_methods('__getitem__', '(0,0)', nloop=1000)
      compare_methods('__getitem__', '[0,-1]', nloop=1000)
      compare_methods('__setitem__', '0, 17', nloop=1000, test=False)
      compare_methods('__setitem__', '(0,0), 17', nloop=1000, test=False)
  
      print("-"*50)
      print("__setitem__ on small arrays")
      timer('nmxs.__setitem__((-1,0),numpy.ma.masked)', 'numpy.ma   ', nloop=10000)
  
      print("-"*50)
      print("__setitem__ on large arrays")
      timer('nmxl.__setitem__((-1,0),numpy.ma.masked)', 'numpy.ma   ', nloop=10000)
  
      print("-"*50)
      print("where on small arrays")
      timer('numpy.ma.where(nmxs>2,nmxs,nmys)', 'numpy.ma   ', nloop=1000)
      print("-"*50)
      print("where on large arrays")
      timer('numpy.ma.where(nmxl>2,nmxl,nmyl)', 'numpy.ma   ', nloop=100)
  