Package PyFoam :: Package ThirdParty :: Package Gnuplot :: Module utils
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Source Code for Module PyFoam.ThirdParty.Gnuplot.utils

  1  #! /usr/bin/env python 
  2   
  3  # $Id: utils.py,v 2.4 2003/04/21 09:44:09 mhagger Exp $ 
  4   
  5  # Copyright (C) 1998-2003 Michael Haggerty <mhagger@alum.mit.edu> 
  6  # 
  7  # This file is licensed under the GNU Lesser General Public License 
  8  # (LGPL).  See LICENSE.txt for details. 
  9   
 10  """utils.py -- Utility functions used by Gnuplot. 
 11   
 12  This module contains utility functions used by Gnuplot.py which aren't 
 13  particularly gnuplot-related. 
 14   
 15  """ 
 16   
 17  __cvs_version__ = '$Revision: 2.4 $' 
 18   
 19  import string 
 20  try: 
 21      import Numeric 
 22  except ImportError: 
 23      import numpy as Numeric 
 24      Numeric.Float32=Numeric.float32 
 25   
 26   
27 -def float_array(m):
28 """Return the argument as a Numeric array of type at least 'Float32'. 29 30 Leave 'Float64' unchanged, but upcast all other types to 31 'Float32'. Allow also for the possibility that the argument is a 32 python native type that can be converted to a Numeric array using 33 'Numeric.asarray()', but in that case don't worry about 34 downcasting to single-precision float. 35 36 """ 37 38 try: 39 # Try Float32 (this will refuse to downcast) 40 return Numeric.asarray(m, Numeric.Float32) 41 except TypeError: 42 # That failure might have been because the input array was 43 # of a wider data type than Float32; try to convert to the 44 # largest floating-point type available: 45 return Numeric.asarray(m, Numeric.Float)
46 47
48 -def write_array(f, set, 49 item_sep=' ', 50 nest_prefix='', nest_suffix='\n', nest_sep=''):
51 """Write an array of arbitrary dimension to a file. 52 53 A general recursive array writer. The last four parameters allow 54 a great deal of freedom in choosing the output format of the 55 array. The defaults for those parameters give output that is 56 gnuplot-readable. But using '(",", "{", "}", ",\n")' would output 57 an array in a format that Mathematica could read. 'item_sep' 58 should not contain '%' (or if it does, it should be escaped to 59 '%%') since it is put into a format string. 60 61 The default 2-d file organization:: 62 63 set[0,0] set[0,1] ... 64 set[1,0] set[1,1] ... 65 66 The 3-d format:: 67 68 set[0,0,0] set[0,0,1] ... 69 set[0,1,0] set[0,1,1] ... 70 71 set[1,0,0] set[1,0,1] ... 72 set[1,1,0] set[1,1,1] ... 73 74 """ 75 76 if len(set.shape) == 1: 77 (columns,) = set.shape 78 assert columns > 0 79 fmt = string.join(['%s'] * columns, item_sep) 80 f.write(nest_prefix) 81 f.write(fmt % tuple(set.tolist())) 82 f.write(nest_suffix) 83 elif len(set.shape) == 2: 84 # This case could be done with recursion, but `unroll' for 85 # efficiency. 86 (points, columns) = set.shape 87 assert points > 0 and columns > 0 88 fmt = string.join(['%s'] * columns, item_sep) 89 f.write(nest_prefix + nest_prefix) 90 f.write(fmt % tuple(set[0].tolist())) 91 f.write(nest_suffix) 92 for point in set[1:]: 93 f.write(nest_sep + nest_prefix) 94 f.write(fmt % tuple(point.tolist())) 95 f.write(nest_suffix) 96 f.write(nest_suffix) 97 else: 98 # Use recursion for three or more dimensions: 99 assert set.shape[0] > 0 100 f.write(nest_prefix) 101 write_array(f, set[0], 102 item_sep, nest_prefix, nest_suffix, nest_sep) 103 for subset in set[1:]: 104 f.write(nest_sep) 105 write_array(f, subset, 106 item_sep, nest_prefix, nest_suffix, nest_sep) 107 f.write(nest_suffix)
108