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# -*- coding: utf-8 -*-
"""
Created on Fri Dec 25 17:03:18 2015
@author: ale
"""
import sys,petsc4py
petsc4py.init(sys.argv)
from petsc4py import PETSc
import numpy as np
dim = 2
if not PETSc.COMM_WORLD.rank:
coords = np.asarray([[0.0, 0.0],
[0.5, 0.0],
[1.0, 0.0],
[0.0, 0.5],
[0.5, 0.5],
[1.0, 0.5],
[0.0, 1.0],
[0.5, 1.0],
[1.0, 1.0]], dtype=PETSc.RealType)
cells = np.asarray([[0,1,4,3],
[1,2,5,4],
[3,4,7,6],
[4,5,8,7]], dtype=PETSc.IntType)
else:
coords = np.zeros((0, 2), dtype=PETSc.RealType)
cells = np.zeros((0, 4), dtype=PETSc.IntType)
plex = PETSc.DMPlex().createFromCellList(dim, cells, coords, comm=PETSc.COMM_WORLD)
pStart, pEnd = plex.getChart()
plex.view()
print("pStart, pEnd: ", pStart, pEnd)
# Create section with 1 field with 1 DoF per vertex, edge and cell
numComp = 1
# Start with an empty vector
numDof = [0] * 3
# Field defined on vertices
numDof[0] = 1
# Field defined on edges
numDof[1] = 1
# Field defined on cells
numDof[2] = 1
plex.setNumFields(1)
origSect = plex.createSection(numComp, numDof)
origSect.setFieldName(0, 'TestField')
origSect.setUp()
origSect.view()
plex.setSection(origSect)
origVec = plex.createGlobalVec()
origVec.view()
origVec.setValues(list(range(pStart, pEnd)),list(range(pStart,pEnd)))
origVec.assemblyBegin()
origVec.assemblyEnd()
origVec.view()
if PETSc.COMM_WORLD.size > 1:
sf = plex.distribute()
sf.view()
newSect, newVec = plex.distributeField(sf, origSect, origVec)
else:
newSect = origSect
newVec = origVec
newSect.view()
newVec.view()
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