formats.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 » formats.py
#!/usr/bin/env python
# (C) 2000 Huaiyu Zhu <hzhu@users.sourceforge.net>.  Licence: GPL
# $I$
"""
Auxiliary stuff for MatPy:
  formating
  axes removal
"""

#------------------------------------------------------------------
# Formating functions
"??? Is there a better way to define format for complex numbers?"
import string
def shortI(x):  return "% -3d" % x
def shortF(x):  return "% -6.3g" % x
def shortC(x):  return "%8s" % ("% .3g% +.3gj" % (x.real, x.imag))

def longI(x):  return "%-11d" % x
def longF(x):  return "%-11.8g" % x
def longC(x):  return "%19s" % ("% .8g% +.8gj" % (x.real, x.imag))

#------------------------------------------------------------------
formatI = shortI
formatF = shortF
formatC = shortC

def reprI(seq, n=0):
  "Return formatted representation of multiarray"
  if len(seq.shape) <= 1:
    return "[ " + string.join(map(formatI, list(seq)),', ') + " ]"
  else:
    return "[" + string.join(
      map(lambda x,n=n:reprI(x,n+1), seq), ',\n'+' '*(n+1)) + "]"

def strI(seq, n=0):
  "Return formated string from multiarray"
  if len(seq.shape) <= 1:
    return string.join(map(formatI, list(seq)),' ')
  else:
    return "[" + string.join(
      map(lambda x,n=n:strI(x,n+1), seq), '\n'+' '*(n+1)) + " ]"
  return s

def reprF(seq, n=0):
  "Return formated representation of multiarray"
  if len(seq.shape) <= 1:
    return "[ " + string.join(map(formatF, list(seq)),', ') + " ]"
  else:
    return "[" + string.join(
      map(lambda x,n=n:reprF(x,n+1), seq), ',\n'+' '*(n+1)) + "]"

def strF(seq, n=0):
  "Return formated string from multiarray"
  if len(seq.shape) <= 1:
    return string.join(map(formatF, list(seq)),' ')
  else:
    return "[" + string.join(
      map(lambda x,n=n:strF(x,n+1), seq),'\n'+' '*(n+1)) + " ]"
  return s

def reprC(seq, n=0):
  "Return formated representation of multiarray (complex)"
  if len(seq.shape) <= 1:
    return "[ " + string.join(map(formatC, list(seq)),', ') + "]"
  else:
    return "[" + string.join(
      map(lambda x,n=n:reprC(x,n+1), seq), ',\n'+' '*(n+1)) + "]"

def strC(seq, n=0):
  "Return formated string from multiarray (complex)"
  if len(seq.shape) <= 1:
    return string.join(map(formatC, list(seq)),' ')
  else:
    return "[" + string.join(
      map(lambda x,n=n:strC(x,n+1), seq), '\n'+' '*(n+1)) + " ]"

#------------------------------------------------------------------
import Numeric

def compactAxes(A):
  """Return an array with axes of length 1 removed"""
  index = []
  for length in Numeric.shape(A):
    if length == 1:  index.append(0)
    else:      index.append(Numeric.slice(None))
  return A[tuple(index)]

def DelAxes(m):
  """  Removes all axes with length one"""
  new_shape = []
  for length in m.shape:
    if length > 1:  new_shape.append(length)
  return Numeric.reshape(m, new_shape)

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