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# $Id$ |
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|
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## @file symbols.py |
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|
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""" |
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some tools supporting the usage of symbols. |
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|
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@var __author__: name of author |
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@var __copyright__: copyrights |
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@var __license__: licence agreement |
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@var __url__: url entry point on documentation |
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@var __version__: version |
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@var __date__: date of the version |
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""" |
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|
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__author__="Lutz Gross, l.gross@uq.edu.au" |
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__copyright__=""" Copyright (c) 2006 by ACcESS MNRF |
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http://www.access.edu.au |
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Primary Business: Queensland, Australia""" |
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__license__="""Licensed under the Open Software License version 3.0 |
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http://www.opensource.org/licenses/osl-3.0.php""" |
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__url__="http://www.iservo.edu.au/esys/escript" |
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__version__="$Revision$" |
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__date__="$Date$" |
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|
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from util import Symbol |
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|
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def ScalarSymbol(dim=None): |
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""" |
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returns a rank 0 L{Symbol}. |
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|
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@param dim: spatial dimension or an object that has the C{getDim} method defining the spatial dimension. If dim=C{None}, the spatial diminsion of the returned L{Symbol} is undefined. |
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@type dim: C{None}, C{int} or any object with a C{getDim} method |
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@return: a L{Symbol} of rank 0. |
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@rtype: L{Symbol} |
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""" |
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if hasattr(dim,"getDim"): |
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d=dim.getDim() |
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else: |
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d=dim |
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return Symbol(shape=(),dim=d,args=[]) |
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|
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|
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def VectorSymbol(dim=3): |
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""" |
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returns a vector L{Symbol} of rank 1 and spatial dimension C{dim} |
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|
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@param dim: spatial dimension or an object that has the C{getDim} method defining the spatial dimension. |
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@type dim: C{int} or any object with a C{getDim} method |
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@return: a L{Symbol} of shape (C{dim},) |
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@rtype: L{Symbol} |
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""" |
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if hasattr(dim,"getDim"): |
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d=dim.getDim() |
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else: |
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d=dim |
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return Symbol(shape=(d,),dim=d,args=[]) |
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|
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def TensorSymbol(dim=3): |
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""" |
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returns a tensor L{Symbol} of rank 2 and spatial dimension C{dim} |
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|
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@param dim: spatial dimension or an object that has the C{getDim} method defining the spatial dimension. |
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@type dim: C{int} or any object with a C{getDim} method |
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@return: a L{Symbol} of shape (C{dim},C{dim}) |
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@rtype: L{Symbol} |
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""" |
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if hasattr(dim,"getDim"): |
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d=dim.getDim() |
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else: |
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d=dim |
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return Symbol(shape=(d,d),dim=d,args=[]) |
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|
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def Tensor3Symbol(dim=3): |
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""" |
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returns a tensor L{Symbol} of rank 3 and spatial dimension C{dim} |
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|
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@param dim: spatial dimension or an object that has the C{getDim} method defining the spatial dimension. |
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@type dim: C{int} or any object with a C{getDim} method |
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@return: a L{Symbol} of shape (C{dim},C{dim},C{dim}) |
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@rtype: L{Symbol} |
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""" |
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if hasattr(dim,"getDim"): |
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d=dim.getDim() |
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else: |
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d=dim |
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return Symbol(shape=(d,d,d),dim=d,args=[]) |
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|
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def Tensor4Symbol(dim=3): |
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""" |
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returns a tensor L{Symbol} of rank 4 and spatial dimension C{dim} |
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|
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@param dim: spatial dimension or an object that has the C{getDim} method defining the spatial dimension. |
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@type dim: C{int} or any object with a C{getDim} method |
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@return: a L{Symbol} of shape (C{dim},C{dim},C{dim},C{dim}) |
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@rtype: L{Symbol} |
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""" |
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if hasattr(dim,"getDim"): |
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d=dim.getDim() |
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else: |
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d=dim |
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return Symbol(shape=(d,d,d,d),dim=d,args=[]) |
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# |
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# $Log:$ |
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# |
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# vim: expandtab shiftwidth=4: |
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