def __new__(cls, strain_matrix, dfm=None):
"""
Create a Strain object. Note that the constructor uses __new__
rather than __init__ according to the standard method of
subclassing numpy ndarrays. Note also that the default constructor
does not include the deformation gradient
Args:
strain_matrix (3x3 array-like): the 3x3 array-like
representing the Green-Lagrange strain
"""
obj = SQTensor(strain_matrix).view(cls)
obj._dfm = dfm
if not obj.is_symmetric():
raise ValueError("Strain objects must be initialized "
"with a symmetric array-like.")
if dfm is None:
warnings.warn("Constructing a strain object without a deformation "
"matrix makes many methods unusable. Use "
"Strain.from_deformation to construct a Strain object"
" from a deformation gradient.")
elif (np.array(dfm) - obj < 1e-5).all():
warnings.warn("Warning: deformation matrix does not correspond "
"to input strain_matrix value")
return obj
def __new__(cls, strain_matrix, dfm=None):
"""
Create a Strain object. Note that the constructor uses __new__
rather than __init__ according to the standard method of
subclassing numpy ndarrays. Note also that the default constructor
does not include the deformation gradient
Args:
strain_matrix (3x3 array-like): the 3x3 array-like
representing the Green-Lagrange strain
"""
obj = SQTensor(strain_matrix).view(cls)
obj._dfm = dfm
if not obj.is_symmetric():
raise ValueError("Strain objects must be initialized "
"with a symmetric array-like.")
if dfm is None:
warnings.warn(
"Constructing a strain object without a deformation "
"matrix makes many methods unusable. Use "
"Strain.from_deformation to construct a Strain object"
" from a deformation gradient.")
elif (np.array(dfm) - obj < 1e-5).all():
warnings.warn("Warning: deformation matrix does not correspond "
"to input strain_matrix value")
return obj
