discretize.base.BaseMesh

class discretize.base.BaseMesh(n=None, x0=None, **kwargs)

Bases: properties.base.base.HasProperties, discretize.mixins.InterfaceMixins

BaseMesh does all the counting you don’t want to do. BaseMesh should be inherited by meshes with a regular structure.

Required Properties:

• axis_u (Vector3): Vector orientation of u-direction. For more details see the docs for the rotation_matrix property., a 3D Vector of <class ‘float’> with shape (3), Default: X
• axis_v (Vector3): Vector orientation of v-direction. For more details see the docs for the rotation_matrix property., a 3D Vector of <class ‘float’> with shape (3), Default: Y
• axis_w (Vector3): Vector orientation of w-direction. For more details see the docs for the rotation_matrix property., a 3D Vector of <class ‘float’> with shape (3), Default: Z
• reference_system (String): The type of coordinate reference frame. Can take on the values cartesian, cylindrical, or spherical. Abbreviations of these are allowed., a unicode string, Default: cartesian
• x0 (Array): origin of the mesh (dim, ), a list or numpy array of <class ‘float’>, <class ‘int’> with shape (*)

Attributes:

axis_u

axis_u (Vector3): Vector orientation of u-direction. For more details see the docs for the rotation_matrix property., a 3D Vector of <class ‘float’> with shape (3), Default: X

axis_v

axis_v (Vector3): Vector orientation of v-direction. For more details see the docs for the rotation_matrix property., a 3D Vector of <class ‘float’> with shape (3), Default: Y

axis_w

axis_w (Vector3): Vector orientation of w-direction. For more details see the docs for the rotation_matrix property., a 3D Vector of <class ‘float’> with shape (3), Default: Z

dim

The dimension of the mesh (1, 2, or 3).

nC

Total number of cells in the mesh.

nE

Total number of edges.

nEx

Number of x-edges

nEy

Number of y-edges

nEz

Number of z-edges

nF

Total number of faces.

nFx

Number of x-faces

nFy

Number of y-faces

nFz

Number of z-faces

nN

Total number of nodes

normals

Face Normals

reference_is_rotated

True if the axes are rotated from the traditional <X,Y,Z> system

reference_system

reference_system (String): The type of coordinate reference frame. Can take on the values cartesian, cylindrical, or spherical. Abbreviations of these are allowed., a unicode string, Default: cartesian

rotation_matrix

Builds a rotation matrix to transform coordinates from their coordinate system into a conventional cartesian system.

tangents

Edge Tangents

vnE

Total number of edges in each direction

vnF

Total number of faces in each direction

x0

x0 (Array): origin of the mesh (dim, ), a list or numpy array of <class ‘float’>, <class ‘int’> with shape (*)

Methods

copy(self)	Make a copy of the current mesh
deserialize(value[, trusted, strict, …])	Creates HasProperties instance from serialized dictionary
equal(self, other)	Determine if two HasProperties instances are equivalent
from_omf(element)	Convert an OMF element to it’s proper discretize type.
projectEdgeVector(self, eV)	Given a vector, eV, in cartesian coordinates, this will project it onto the mesh using the tangents
projectFaceVector(self, fV)	Given a vector, fV, in cartesian coordinates, this will project it onto the mesh using the normals
save(self[, filename, verbose])	Save the mesh to json :param str file: filename for saving the casing properties :param str directory: working directory for saving the file
serialize(self[, include_class, save_dynamic])	Serializes a HasProperties instance to dictionary
toVTK(mesh[, models])	Convert this mesh object to it’s proper VTK or pyvista data object with the given model dictionary as the cell data of that dataset.
to_omf(mesh[, models])	Convert this mesh object to it’s proper omf data object with the given model dictionary as the cell data of that dataset.
to_vtk(mesh[, models])	Convert this mesh object to it’s proper VTK or pyvista data object with the given model dictionary as the cell data of that dataset.
validate(self)	Call all registered class validator methods
writeVTK(mesh, filename[, models, directory])	Makes and saves a VTK object from this mesh and given models
write_vtk(mesh, filename[, models, directory])	Makes and saves a VTK object from this mesh and given models

Examples using discretize.base.BaseMesh

Operators: Cahn Hilliard

Plot Mirrored Cylindrically Symmetric Model

Basic Forward 2D DC Resistivity

Basic: PlotImage

QuadTree: FaceDiv

QuadTree: Hanging Nodes

Plotting: Streamline thickness

Overview of Mesh Types

Tensor meshes

Cylindrical meshes

Tree Meshes

Averaging Matricies

Differential Operators

Basic Inner Products

Constitutive Relations

Differential Operators

Advanced Examples

Gauss’ Law of Electrostatics

Advection-Diffusion Equation

Attributes

BaseMesh.axis_u

X

Type:axis_u (Vector3) Type:Vector orientation of u-direction. For more details see the docs for the rotation_matrix property., a 3D Vector of <class ‘float’> with shape (3), Default

BaseMesh.axis_v

Y

Type:axis_v (Vector3) Type:Vector orientation of v-direction. For more details see the docs for the rotation_matrix property., a 3D Vector of <class ‘float’> with shape (3), Default

BaseMesh.axis_w

Z

Type:axis_w (Vector3) Type:Vector orientation of w-direction. For more details see the docs for the rotation_matrix property., a 3D Vector of <class ‘float’> with shape (3), Default

BaseMesh.dim

The dimension of the mesh (1, 2, or 3).

Returns:dimension of the mesh Return type:int

BaseMesh.nC

Total number of cells in the mesh.

Returns:number of cells in the mesh Return type:int

Examples

import discretize
import numpy as np
mesh = discretize.TensorMesh([np.ones(n) for n in [2,3]])
mesh.plotGrid(centers=True, showIt=True)

print(mesh.nC)

(Source code, png, hires.png, pdf)

BaseMesh.nE

Total number of edges.

Returns:nE Return type:int = sum([nEx, nEy, nEz])

BaseMesh.nEx

Number of x-edges

Returns:nEx Return type:int

BaseMesh.nEy

Number of y-edges

Returns:nEy Return type:int

BaseMesh.nEz

Number of z-edges

Returns:nEz Return type:int

BaseMesh.nF

Total number of faces.

Return type:int Returns:sum([nFx, nFy, nFz])

BaseMesh.nFx

Number of x-faces

Return type:int Returns:nFx

BaseMesh.nFy

Number of y-faces

Return type:int Returns:nFy

BaseMesh.nFz

Number of z-faces

Return type:int Returns:nFz

BaseMesh.nN

Total number of nodes

Returns:number of nodes in the mesh Return type:int

Examples

import discretize
import numpy as np
mesh = discretize.TensorMesh([np.ones(n) for n in [2,3]])
mesh.plotGrid(nodes=True, showIt=True)

print(mesh.nN)

(Source code, png, hires.png, pdf)

BaseMesh.normals

Face Normals

Return type:numpy.ndarray Returns:normals, (sum(nF), dim)

BaseMesh.reference_is_rotated

True if the axes are rotated from the traditional <X,Y,Z> system with vectors of \((1,0,0)\), \((0,1,0)\), and \((0,0,1)\)

BaseMesh.reference_system

cartesian

Type:reference_system (String) Type:The type of coordinate reference frame. Can take on the values cartesian, cylindrical, or spherical. Abbreviations of these are allowed., a unicode string, Default

BaseMesh.rotation_matrix

Builds a rotation matrix to transform coordinates from their coordinate system into a conventional cartesian system. This is built off of the three axis_u, axis_v, and axis_w properties; these mapping coordinates use the letters U, V, and W (the three letters preceding X, Y, and Z in the alphabet) to define the projection of the X, Y, and Z durections. These UVW vectors describe the placement and transformation of the mesh’s coordinate sytem assuming at most 3 directions.

Why would you want to use these UVW mapping vectors the this rotation_matrix property? They allow us to define the realationship between local and global coordinate systems and provide a tool for switching between the two while still maintaing the connectivity of the mesh’s cells. For a visual example of this, please see the figure in the docs for the InterfaceVTK.

BaseMesh.tangents

Edge Tangents

Return type:numpy.ndarray Returns:normals, (sum(nE), dim)

BaseMesh.vnE

Total number of edges in each direction

Returns:

• vnE (numpy.ndarray = [nEx, nEy, nEz], (dim, ))
• .. plot:: – :include-source:

  import discretize import numpy as np M = discretize.TensorMesh([np.ones(n) for n in [2,3]]) M.plotGrid(edges=True, showIt=True)

BaseMesh.vnF

Total number of faces in each direction

Return type:numpy.ndarray Returns:[nFx, nFy, nFz], (dim, )

import discretize
import numpy as np
M = discretize.TensorMesh([np.ones(n) for n in [2,3]])
M.plotGrid(faces=True, showIt=True)

(Source code, png, hires.png, pdf)

BaseMesh.x0

origin of the mesh (dim, ), a list or numpy array of <class ‘float’>, <class ‘int’> with shape (*)

Type:x0 (Array)

Methods

BaseMesh.copy(self)

Make a copy of the current mesh

classmethod BaseMesh.deserialize(value, trusted=False, strict=False, assert_valid=False, **kwargs)

Creates HasProperties instance from serialized dictionary

This uses the Property deserializers to deserialize all JSON-compatible dictionary values into their corresponding Property values on a new instance of a HasProperties class. Extra keys in the dictionary that do not correspond to Properties will be ignored.

Parameters:

• value - Dictionary to deserialize new instance from.
• trusted - If True (and if the input dictionary has '__class__' keyword and this class is in the registry), the new HasProperties class will come from the dictionary. If False (the default), only the HasProperties class this method is called on will be constructed.
• strict - Requires '__class__', if present on the input dictionary, to match the deserialized instance’s class. Also disallows unused properties in the input dictionary. Default is False.
• assert_valid - Require deserialized instance to be valid. Default is False.
• Any other keyword arguments will be passed through to the Property deserializers.

BaseMesh.equal(self, other)

Determine if two HasProperties instances are equivalent

Equivalence is determined by checking if all Property values on two instances are equal, using Property.equal.

static BaseMesh.from_omf(element)

Convert an OMF element to it’s proper discretize type. Automatically determines the output type. Returns both the mesh and a dictionary of model arrays.

BaseMesh.projectEdgeVector(self, eV)

Given a vector, eV, in cartesian coordinates, this will project it onto the mesh using the tangents

Parameters:eV (numpy.ndarray) – edge vector with shape (nE, dim) Return type:numpy.ndarray Returns:projected edge vector, (nE, )

BaseMesh.projectFaceVector(self, fV)

Given a vector, fV, in cartesian coordinates, this will project it onto the mesh using the normals

Parameters:fV (numpy.ndarray) – face vector with shape (nF, dim) Return type:numpy.ndarray Returns:projected face vector, (nF, )

BaseMesh.save(self, filename='mesh.json', verbose=False)

Save the mesh to json :param str file: filename for saving the casing properties :param str directory: working directory for saving the file

BaseMesh.serialize(self, include_class=True, save_dynamic=False, **kwargs)

Serializes a HasProperties instance to dictionary

This uses the Property serializers to serialize all Property values to a JSON-compatible dictionary. Properties that are undefined are not included. If the HasProperties instance contains a reference to itself, a properties.SelfReferenceError will be raised.

Parameters:

• include_class - If True (the default), the name of the class will also be saved to the serialized dictionary under key '__class__'
• save_dynamic - If True, dynamic properties are written to the serialized dict (default: False).
• Any other keyword arguments will be passed through to the Property serializers.

BaseMesh.toVTK(mesh, models=None)

Convert this mesh object to it’s proper VTK or pyvista data object with the given model dictionary as the cell data of that dataset.

Parameters:models (dict(numpy.ndarray)) – Name(‘s) and array(‘s). Match number of cells

BaseMesh.to_omf(mesh, models=None)

Convert this mesh object to it’s proper omf data object with the given model dictionary as the cell data of that dataset.

Parameters:models (dict(numpy.ndarray)) – Name(‘s) and array(‘s). Match number of cells

BaseMesh.to_vtk(mesh, models=None)

Convert this mesh object to it’s proper VTK or pyvista data object with the given model dictionary as the cell data of that dataset.

Parameters:models (dict(numpy.ndarray)) – Name(‘s) and array(‘s). Match number of cells

BaseMesh.validate(self)

Call all registered class validator methods

These are all methods decorated with @properties.validator. Validator methods are expected to raise a ValidationError if they fail.

BaseMesh.writeVTK(mesh, filename, models=None, directory='')

Makes and saves a VTK object from this mesh and given models

Parameters:

• filename (str) – path to the output vtk file or just its name if directory is specified
• models (dict) – dictionary of numpy.array - Name(‘s) and array(‘s). Match number of cells
• directory (str) – directory where the UBC GIF file lives

BaseMesh.write_vtk(mesh, filename, models=None, directory='')

Makes and saves a VTK object from this mesh and given models

Parameters:

• filename (str) – path to the output vtk file or just its name if directory is specified
• models (dict) – dictionary of numpy.array - Name(‘s) and array(‘s). Match number of cells
• directory (str) – directory where the UBC GIF file lives