mirror of
https://github.com/wassname/simpeg.git
synced 2026-06-28 22:54:10 +08:00
Dave Marchant
440 lines
17 KiB
Python
440 lines
17 KiB
Python
import numpy as np
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import scipy.sparse as sp
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from BaseMesh import BaseMesh
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from TensorView import TensorView
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from DiffOperators import DiffOperators
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from InnerProducts import InnerProducts
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from SimPEG.utils import ndgrid, mkvc, spzeros, interpmat
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class TensorMesh(BaseMesh, TensorView, DiffOperators, InnerProducts):
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"""
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TensorMesh is a mesh class that deals with tensor product meshes.
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Any Mesh that has a constant width along the entire axis
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such that it can defined by a single width vector, called 'h'.
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::
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hx = np.array([1,1,1])
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hy = np.array([1,2])
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hz = np.array([1,1,1,1])
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mesh = TensorMesh([hx, hy, hz])
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Example of a padded tensor mesh:
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.. plot:: examples/mesh/plot_TensorMesh.py
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"""
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_meshType = 'TENSOR'
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def __init__(self, h, x0=None):
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super(TensorMesh, self).__init__(np.array([x.size for x in h]), x0)
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assert len(h) == len(self.x0), "Dimension mismatch. x0 != len(h)"
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for i, h_i in enumerate(h):
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assert type(h_i) == np.ndarray, ("h[%i] is not a numpy array." % i)
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assert len(h_i.shape) == 1, ("h[%i] must be a 1D numpy array." % i)
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# Ensure h contains 1D vectors
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self._h = [mkvc(x) for x in h]
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def __str__(self):
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outStr = ' ---- {0:d}-D TensorMesh ---- '.format(self.dim)
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def printH(hx, outStr=''):
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i = -1
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while True:
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i = i + 1
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if i > hx.size:
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break
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elif i == hx.size:
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break
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h = hx[i]
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n = 1
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for j in range(i+1, hx.size):
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if hx[j] == h:
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n = n + 1
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i = i + 1
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else:
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break
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if n == 1:
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outStr = outStr + ' {0:.2f},'.format(h)
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else:
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outStr = outStr + ' {0:d}*{1:.2f},'.format(n,h)
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return outStr[:-1]
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if self.dim == 1:
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outStr = outStr + '\n x0: {0:.2f}'.format(self.x0[0])
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outStr = outStr + '\n nCx: {0:d}'.format(self.nCx)
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outStr = outStr + printH(self.hx, outStr='\n hx:')
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pass
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elif self.dim == 2:
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outStr = outStr + '\n x0: {0:.2f}'.format(self.x0[0])
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outStr = outStr + '\n y0: {0:.2f}'.format(self.x0[1])
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outStr = outStr + '\n nCx: {0:d}'.format(self.nCx)
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outStr = outStr + '\n nCy: {0:d}'.format(self.nCy)
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outStr = outStr + printH(self.hx, outStr='\n hx:')
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outStr = outStr + printH(self.hy, outStr='\n hy:')
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elif self.dim == 3:
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outStr = outStr + '\n x0: {0:.2f}'.format(self.x0[0])
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outStr = outStr + '\n y0: {0:.2f}'.format(self.x0[1])
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outStr = outStr + '\n z0: {0:.2f}'.format(self.x0[2])
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outStr = outStr + '\n nCx: {0:d}'.format(self.nCx)
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outStr = outStr + '\n nCy: {0:d}'.format(self.nCy)
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outStr = outStr + '\n nCz: {0:d}'.format(self.nCz)
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outStr = outStr + printH(self.hx, outStr='\n hx:')
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outStr = outStr + printH(self.hy, outStr='\n hy:')
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outStr = outStr + printH(self.hz, outStr='\n hz:')
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return outStr
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def h():
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doc = "h is a list containing the cell widths of the tensor mesh in each dimension."
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fget = lambda self: self._h
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return locals()
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h = property(**h())
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def hx():
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doc = "Width of cells in the x direction"
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fget = lambda self: self._h[0]
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return locals()
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hx = property(**hx())
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def hy():
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doc = "Width of cells in the y direction"
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fget = lambda self: None if self.dim < 2 else self._h[1]
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return locals()
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hy = property(**hy())
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def hz():
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doc = "Width of cells in the z direction"
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fget = lambda self: None if self.dim < 3 else self._h[2]
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return locals()
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hz = property(**hz())
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def vectorNx():
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doc = "Nodal grid vector (1D) in the x direction."
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fget = lambda self: np.r_[0., self.hx.cumsum()] + self.x0[0]
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return locals()
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vectorNx = property(**vectorNx())
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def vectorNy():
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doc = "Nodal grid vector (1D) in the y direction."
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fget = lambda self: None if self.dim < 2 else np.r_[0., self.hy.cumsum()] + self.x0[1]
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return locals()
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vectorNy = property(**vectorNy())
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def vectorNz():
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doc = "Nodal grid vector (1D) in the z direction."
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fget = lambda self: None if self.dim < 3 else np.r_[0., self.hz.cumsum()] + self.x0[2]
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return locals()
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vectorNz = property(**vectorNz())
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def vectorCCx():
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doc = "Cell-centered grid vector (1D) in the x direction."
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fget = lambda self: np.r_[0, self.hx[:-1].cumsum()] + self.hx*0.5 + self.x0[0]
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return locals()
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vectorCCx = property(**vectorCCx())
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def vectorCCy():
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doc = "Cell-centered grid vector (1D) in the y direction."
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fget = lambda self: None if self.dim < 2 else np.r_[0, self.hy[:-1].cumsum()] + self.hy*0.5 + self.x0[1]
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return locals()
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vectorCCy = property(**vectorCCy())
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def vectorCCz():
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doc = "Cell-centered grid vector (1D) in the z direction."
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fget = lambda self: None if self.dim < 3 else np.r_[0, self.hz[:-1].cumsum()] + self.hz*0.5 + self.x0[2]
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return locals()
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vectorCCz = property(**vectorCCz())
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def gridCC():
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doc = "Cell-centered grid."
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def fget(self):
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if self._gridCC is None:
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self._gridCC = ndgrid([x for x in [self.vectorCCx, self.vectorCCy, self.vectorCCz] if not x is None])
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return self._gridCC
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return locals()
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_gridCC = None # Store grid by default
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gridCC = property(**gridCC())
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def gridN():
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doc = "Nodal grid."
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def fget(self):
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if self._gridN is None:
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self._gridN = ndgrid([x for x in [self.vectorNx, self.vectorNy, self.vectorNz] if not x is None])
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return self._gridN
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return locals()
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_gridN = None # Store grid by default
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gridN = property(**gridN())
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def gridFx():
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doc = "Face staggered grid in the x direction."
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def fget(self):
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if self._gridFx is None:
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self._gridFx = ndgrid([x for x in [self.vectorNx, self.vectorCCy, self.vectorCCz] if not x is None])
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return self._gridFx
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return locals()
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_gridFx = None # Store grid by default
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gridFx = property(**gridFx())
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def gridFy():
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doc = "Face staggered grid in the y direction."
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def fget(self):
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if self._gridFy is None and self.dim > 1:
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self._gridFy = ndgrid([x for x in [self.vectorCCx, self.vectorNy, self.vectorCCz] if not x is None])
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return self._gridFy
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return locals()
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_gridFy = None # Store grid by default
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gridFy = property(**gridFy())
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def gridFz():
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doc = "Face staggered grid in the z direction."
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def fget(self):
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if self._gridFz is None and self.dim > 2:
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self._gridFz = ndgrid([x for x in [self.vectorCCx, self.vectorCCy, self.vectorNz] if not x is None])
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return self._gridFz
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return locals()
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_gridFz = None # Store grid by default
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gridFz = property(**gridFz())
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def gridEx():
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doc = "Edge staggered grid in the x direction."
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def fget(self):
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if self._gridEx is None:
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self._gridEx = ndgrid([x for x in [self.vectorCCx, self.vectorNy, self.vectorNz] if not x is None])
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return self._gridEx
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return locals()
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_gridEx = None # Store grid by default
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gridEx = property(**gridEx())
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def gridEy():
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doc = "Edge staggered grid in the y direction."
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def fget(self):
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if self._gridEy is None and self.dim > 1:
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self._gridEy = ndgrid([x for x in [self.vectorNx, self.vectorCCy, self.vectorNz] if not x is None])
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return self._gridEy
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return locals()
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_gridEy = None # Store grid by default
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gridEy = property(**gridEy())
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def gridEz():
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doc = "Edge staggered grid in the z direction."
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def fget(self):
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if self._gridEz is None and self.dim > 2:
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self._gridEz = ndgrid([x for x in [self.vectorNx, self.vectorNy, self.vectorCCz] if not x is None])
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return self._gridEz
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return locals()
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_gridEz = None # Store grid by default
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gridEz = property(**gridEz())
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# --------------- Geometries ---------------------
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def vol():
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doc = "Construct cell volumes of the 3D model as 1d array."
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def fget(self):
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if(self._vol is None):
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vh = self.h
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# Compute cell volumes
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if(self.dim == 1):
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self._vol = mkvc(vh[0])
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elif(self.dim == 2):
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# Cell sizes in each direction
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self._vol = mkvc(np.outer(vh[0], vh[1]))
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elif(self.dim == 3):
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# Cell sizes in each direction
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self._vol = mkvc(np.outer(mkvc(np.outer(vh[0], vh[1])), vh[2]))
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return self._vol
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return locals()
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_vol = None
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vol = property(**vol())
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def area():
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doc = "Construct face areas of the 3D model as 1d array."
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def fget(self):
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if(self._area is None):
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# Ensure that we are working with column vectors
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vh = self.h
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# The number of cell centers in each direction
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n = self.n
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# Compute areas of cell faces
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if(self.dim == 1):
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self._area = np.ones(n[0]+1)
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elif(self.dim == 2):
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area1 = np.outer(np.ones(n[0]+1), vh[1])
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area2 = np.outer(vh[0], np.ones(n[1]+1))
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self._area = np.r_[mkvc(area1), mkvc(area2)]
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elif(self.dim == 3):
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area1 = np.outer(np.ones(n[0]+1), mkvc(np.outer(vh[1], vh[2])))
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area2 = np.outer(vh[0], mkvc(np.outer(np.ones(n[1]+1), vh[2])))
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area3 = np.outer(vh[0], mkvc(np.outer(vh[1], np.ones(n[2]+1))))
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self._area = np.r_[mkvc(area1), mkvc(area2), mkvc(area3)]
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return self._area
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return locals()
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_area = None
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area = property(**area())
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def edge():
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doc = "Construct edge legnths of the 3D model as 1d array."
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def fget(self):
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if(self._edge is None):
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# Ensure that we are working with column vectors
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vh = self.h
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# The number of cell centers in each direction
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n = self.n
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# Compute edge lengths
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if(self.dim == 1):
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self._edge = mkvc(vh[0])
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elif(self.dim == 2):
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l1 = np.outer(vh[0], np.ones(n[1]+1))
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l2 = np.outer(np.ones(n[0]+1), vh[1])
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self._edge = np.r_[mkvc(l1), mkvc(l2)]
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elif(self.dim == 3):
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l1 = np.outer(vh[0], mkvc(np.outer(np.ones(n[1]+1), np.ones(n[2]+1))))
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l2 = np.outer(np.ones(n[0]+1), mkvc(np.outer(vh[1], np.ones(n[2]+1))))
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l3 = np.outer(np.ones(n[0]+1), mkvc(np.outer(np.ones(n[1]+1), vh[2])))
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self._edge = np.r_[mkvc(l1), mkvc(l2), mkvc(l3)]
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return self._edge
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return locals()
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_edge = None
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edge = property(**edge())
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# --------------- Methods ---------------------
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def isInside(self, pts):
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"""
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Determines if a set of points are inside a mesh.
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:param numpy.ndarray pts: Location of points to test
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:rtype numpy.ndarray
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:return inside, numpy array of booleans
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"""
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pts = np.atleast_2d(pts)
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inside = (pts[:,0] >= self.vectorNx.min()) & (pts[:,0] <= self.vectorNx.max())
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if self.dim > 1:
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inside = inside & ((pts[:,1] >= self.vectorNy.min()) & (pts[:,1] <= self.vectorNy.max()))
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if self.dim > 2:
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inside = inside & ((pts[:,2] >= self.vectorNz.min()) & (pts[:,2] <= self.vectorNz.max()))
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return inside
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def getInterpolationMat(self, loc, locType):
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""" Produces interpolation matrix
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:param numpy.ndarray loc: Location of points to interpolate to
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:param str locType: What to interpolate (see below)
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:rtype: scipy.sparse.csr.csr_matrix
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:return: M, the interpolation matrix
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locType can be::
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'ex' -> x-component of field defined on edges
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'ey' -> y-component of field defined on edges
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'ez' -> z-component of field defined on edges
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'fx' -> x-component of field defined on edges
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'fy' -> y-component of field defined on edges
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'fz' -> z-component of field defined on edges
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'n' -> scalar field defined on nodes
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'cc' -> scalar field defined on cell centres
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"""
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loc = np.atleast_2d(loc)
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assert np.all(self.isInside(loc)), "Points outside of mesh"
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if self.dim == 3:
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if locType == 'fx':
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Qx = interpmat(self.vectorNx,
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self.vectorCCy,
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self.vectorCCz,
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loc[:,0], loc[:,1], loc[:,2])
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Qy = spzeros(loc.shape[0], self.nF[1])
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Qz = spzeros(loc.shape[0], self.nF[2])
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Q = sp.hstack([Qx, Qy, Qz])
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elif locType == 'fy':
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Qx = spzeros(loc.shape[0], self.nF[0])
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Qy = interpmat(self.vectorCCx,
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self.vectorNy,
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self.vectorCCz,
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loc[:,0], loc[:,1], loc[:,2])
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Qz = spzeros(loc.shape[0], self.nF[2])
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Q = sp.hstack([Qx, Qy, Qz])
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elif locType == 'fz':
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Qx = spzeros(loc.shape[0], self.nF[0])
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Qy = spzeros(loc.shape[0], self.nF[1])
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Qz = interpmat(self.vectorCCx,
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self.vectorCCy,
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self.vectorNz,
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loc[:,0], loc[:,1], loc[:,2])
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Q = sp.hstack([Qx, Qy, Qz])
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elif locType == 'ex':
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Qx = interpmat(self.vectorCCx,
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self.vectorNy,
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self.vectorNz,
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loc[:,0], loc[:,1], loc[:,2])
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Qy = spzeros(loc.shape[0], self.nF[1])
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Qz = spzeros(loc.shape[0], self.nF[2])
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Q = sp.hstack([Qx, Qy, Qz])
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elif locType == 'ey':
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Qx = spzeros(loc.shape[0], self.nF[0])
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Qy = interpmat(self.vectorNx,
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self.vectorCCy,
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self.vectorNz,
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loc[:,0], loc[:,1], loc[:,2])
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Qz = spzeros(loc.shape[0], self.nF[2])
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Q = sp.hstack([Qx, Qy, Qz])
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elif locType == 'ez':
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Qx = spzeros(loc.shape[0], self.nF[0])
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Qy = spzeros(loc.shape[0], self.nF[1])
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Qz = interpmat(self.vectorNx,
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self.vectorNy,
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self.vectorCCz,
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loc[:,0], loc[:,1], loc[:,2])
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Q = sp.hstack([Qx, Qy, Qz])
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elif locType == 'n':
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Q = interpmat(self.vectorNx,
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self.vectorNy,
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self.vectorNz,
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loc[:,0], loc[:,1], loc[:,2])
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elif locType == 'cc':
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Q = interpmat(self.vectorCCx,
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self.vectorCCy,
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self.vectorCCz,
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loc[:,0], loc[:,1], loc[:,2])
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else:
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raise NotImplementedError('getInterpolationMat: locType=='+locType)
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else:
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raise NotImplementedError('getInterpolationMat: dim=='+str(m.dim))
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return Q
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if __name__ == '__main__':
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print('Welcome to tensor mesh!')
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testDim = 1
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h1 = 0.3*np.ones(7)
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h1[0] = 0.5
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h1[-1] = 0.6
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h2 = .5 * np.ones(4)
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h3 = .4 * np.ones(6)
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h = [h1, h2, h3]
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h = h[:testDim]
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M = TensorMesh(h)
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xn = M.plotGrid()
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