sfepy.discrete.common.fields module¶
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class
sfepy.discrete.common.fields.
Field
(**kwargs)[source]¶ Base class for fields.
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static
from_args
(name, dtype, shape, region, approx_order=1, space='H1', poly_space_base='lagrange')[source]¶ Create a Field subclass instance corresponding to a given space.
Parameters: name : str
The field name.
dtype : numpy.dtype
The field data type: float64 or complex128.
shape : int/tuple/str
The field shape: 1 or (1,) or ‘scalar’, space dimension (2, or (2,) or 3 or (3,)) or ‘vector’, or a tuple. The field shape determines the shape of the FE base functions and is related to the number of components of variables and to the DOF per node count, depending on the field kind.
region : Region
The region where the field is defined.
approx_order : int/str
The FE approximation order, e.g. 0, 1, 2, ‘1B’ (1 with bubble).
space : str
The function space name.
poly_space_base : str
The name of polynomial space base.
Notes
Assumes one cell type for the whole region!
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from_conf
(conf, regions)[source]¶ Create a Field subclass instance based on the configuration.
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get_dofs_in_region
(region, merge=False, clean=False, warn=False, igs=None)[source]¶ Return indices of DOFs that belong to the given region.
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get_mapping
(ig, region, integral, integration, get_saved=False, return_key=False)[source]¶ For given region, integral and integration type, get a reference mapping, i.e. jacobians, element volumes and base function derivatives for Volume-type geometries, and jacobians, normals and base function derivatives for Surface-type geometries corresponding to the field approximation.
The mappings are cached in the field instance in mappings attribute. The mappings can be saved to mappings0 using Field.save_mappings. The saved mapping can be retrieved by passing get_saved=True. If the required (saved) mapping is not in cache, a new one is created.
Returns: geo : CMapping instance
The reference mapping.
mapping : VolumeMapping or SurfaceMapping instance
The mapping.
key : tuple
The key of the mapping in mappings or mappings0.
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static