Tensor.py :  » Math » Matrix-package-for-Python » MatPy-0.4.0 » Python Open Source

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Python Open Source » Math » Matrix package for Python 
Matrix package for Python » MatPy 0.4.0 » Tensor.py
#!/usr/bin/env python
# (C) 2000 Huaiyu Zhu <hzhu@users.sourceforge.net>.  Licence: GPL
# $Id: Tensor.py,v 1.4 2000/07/26 20:58:27 hzhu Exp $
"""
Tensor class that complements Matrix class
"""

from MatPy import MatrixType
from MatPy.Matrix import to_array
import MLab

class Tensor(MatrixType):
  "class Tensor : rudimentary wrapper around NumPy arrays"
  def __init__(self, data):
    if type(data) == type(MLab.array([])) or type(data) == type([]):
      self.data = MLab.array(data)
    elif isinstance(data, Tensor):
      import copy
      self.data = copy.copy(data.data)
    else:
      try:
        assert data == data + 0
      except:
        print "data is %s" % data
        raise
      self.data =  MLab.array([data])
    self.shape = self.data.shape
    self.typecode = self.data.typecode()

  def __getitem__(self, i):    return Tensor(self.data[i])
  
  def __setitem__(self, i, item):    self.data[i] = to_array(item)
      
  def __mul__(self, other):
    return self.dot(other)


def zeros(a, typecode='d'):
  "zeros(a, typecode) : return a zero tensor"
  return Tensor(MLab.zeros(a, typecode))
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