doc/tutorial/atestMEDLoaderSplitAndMerge1.rst

   1
   2 .. _python_testMEDLoaderSplitAndMerge1_solution:
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   4 Splitting and Merging a MED file using MEDLoader
   5 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   6
   7 ::
   8
   9         import MEDLoader as ml
  10
  11         m0 = ml.MEDCouplingCMesh()
  12         arr = ml.DataArrayDouble(31,1) ; arr.iota(0.)
  13         m0.setCoords(arr,arr)
  14         m0 = m0.buildUnstructured()
  15         m00 = m0[::2]      # Extract even cells
  16         m00.simplexize(0)
  17         m01 = m0[1::2]
  18         m0 = ml.MEDCouplingUMesh.MergeUMeshes([m00,m01])
  19         m0.getCoords()[:] *= 1/15.
  20         m0.setName("mesh")
  21         # Cell field
  22         cellField = ml.MEDCouplingFieldDouble(ml.ON_CELLS, ml.ONE_TIME)
  23         cellField.setTime(5.6,5,6)
  24         cellField.setMesh(m0)
  25         cellField.setName("CellField")
  26         cellField.fillFromAnalytic(1,"exp(-((x-1)*(x-1)+(y-1)*(y-1)))")
  27         cellField.getArray().setInfoOnComponent(0,"powercell [W]")
  28         # Node field
  29         nodeField = ml.MEDCouplingFieldDouble(ml.ON_NODES,ml.ONE_TIME)
  30         nodeField.setTime(5.6,5,6)
  31         nodeField.setMesh(m0)
  32         nodeField.setName("NodeField")
  33         nodeField.fillFromAnalytic(1,"exp(-((x-1)*(x-1)+(y-1)*(y-1)))")
  34         nodeField.getArray().setInfoOnComponent(0,"powernode [W]")
  35         # Splitting
  36         proc0 = m0.getCellsInBoundingBox([(0.,0.4),(0.,0.4)],1e-10)
  37         proc1 = proc0.buildComplement(m0.getNumberOfCells())
  38         #
  39         nodeField0 = nodeField[proc0] ; cellField0 = cellField[proc0] ; cellField0.setMesh(nodeField0.getMesh())
  40         nodeField1 = nodeField[proc1] ; cellField1 = cellField[proc1] ; cellField1.setMesh(nodeField1.getMesh())
  41
  42         proc0_fname = "proc0.med"
  43         ml.WriteField(proc0_fname, nodeField0, True)
  44         ml.WriteFieldUsingAlreadyWrittenMesh(proc0_fname, cellField0)
  45
  46         proc1_fname = "proc1.med"
  47         ml.WriteField(proc1_fname,nodeField1,True)
  48         ml.WriteFieldUsingAlreadyWrittenMesh(proc1_fname,cellField1)
  49         #
  50         # Merging - Sub-optimal method
  51         #
  52         cellField0_read = ml.ReadFieldCell("proc0.med","mesh",0,"CellField",5,6)
  53         cellField1_read = ml.ReadFieldCell("proc1.med","mesh",0,"CellField",5,6)
  54         cellField_read = ml.MEDCouplingFieldDouble.MergeFields([cellField0_read,cellField1_read])
  55         cellFieldCpy = cellField.deepCopy()
  56         cellFieldCpy.substractInPlaceDM(cellField_read,10,1e-12)
  57         cellFieldCpy.getArray().abs()
  58         print cellFieldCpy.getArray().isUniform(0.,1e-12)
  59         #
  60         nodeField0_read = ml.ReadFieldNode("proc0.med","mesh",0,"NodeField",5,6)
  61         nodeField1_read = ml.ReadFieldNode("proc1.med","mesh",0,"NodeField",5,6)
  62         nodeField_read = ml.MEDCouplingFieldDouble.MergeFields([nodeField0_read, nodeField1_read])
  63         nodeField_read.mergeNodes(1e-10)
  64         nodeFieldCpy = nodeField.deepCopy()
  65         nodeFieldCpy.mergeNodes(1e-10)
  66         nodeFieldCpy.substractInPlaceDM(nodeField_read,10,1e-12)
  67         print nodeFieldCpy.getArray().isUniform(0.,1e-12)
  68         #
  69         # Merging - Optimal method
  70         #
  71         fileNames = ["proc0.med","proc1.med"]
  72         msML = [ml.MEDFileMesh.New(fname) for fname in fileNames]
  73         fsML = [ml.MEDFileFields.New(fname) for fname in fileNames]
  74         mergeMLMesh = ml.MEDFileUMesh()
  75         mergeMLFields = ml.MEDFileFields()
  76         for lev in msML[0].getNonEmptyLevels():
  77                 o2nML = len(msML[0].getNonEmptyLevels())*[None]
  78                 cs = [mML.getCoords() for mML in msML]
  79                 mergeMLMesh.setCoords(ml.DataArrayDouble.Aggregate(cs))
  80                 ms = [mML.getMeshAtLevel(lev) for mML in msML]
  81                 m = ml.MEDCouplingUMesh.MergeUMeshes(ms) ; m.setCoords(mergeMLMesh.getCoords())
  82                 o2nML[lev] = m.sortCellsInMEDFileFrmt()
  83                 mergeMLMesh.setMeshAtLevel(lev,m)
  84                 pass
  85
  86         for fieldName in fsML[0].getFieldsNames():
  87                 fmts = [fML[fieldName] for fML in fsML]
  88                 mergeField = ml.MEDFileFieldMultiTS()
  89                 for dt,it,tim in fmts[0].getTimeSteps():
  90                         fts = [fmt[dt,it] for fmt in fmts]
  91                         arrs = len(fts)*[None]
  92                         for typp in fts[0].getTypesOfFieldAvailable():
  93                                 arr1s = []
  94                                 if typp == ml.ON_CELLS:
  95                                         for ft in fts:
  96                                                 for geoTyp,smth in ft.getFieldSplitedByType():
  97                                                         if geoTyp != ml.NORM_ERROR:
  98                                                                 smth1 = filter(lambda x:x[0] == ml.ON_CELLS,smth)
  99                                                                 arr2s = [ft.getUndergroundDataArray()[elt[1][0]:elt[1][1]] for elt in smth1]
 100                                                                 arr1s.append(ml.DataArrayDouble.Aggregate(arr2s))
 101                                                                 pass
 102                                                         pass
 103                                                 pass
 104                                         pass
 105                                 else:
 106                                         for ft in fts:
 107                                                 smth = filter(lambda x:x[0] == ml.NORM_ERROR,ft.getFieldSplitedByType())
 108                                                 arr2 = ml.DataArrayDouble.Aggregate([ft.getUndergroundDataArray()[elt[1][0][1][0]:elt[1][0][1][1]] for elt in smth])
 109                                                 arr1s.append(arr2)
 110                                                 pass
 111                                         pass
 112                                 arr = ml.DataArrayDouble.Aggregate(arr1s)
 113                                 if typp == ml.ON_CELLS:
 114                                      arr.renumberInPlace(o2nML[lev])
 115                                 mcf = ml.MEDCouplingFieldDouble(typp,ml.ONE_TIME) ; mcf.setName(fieldName) ; mcf.setTime(tim,dt,it) ; mcf.setArray(arr)
 116                                 mcf.setMesh(mergeMLMesh.getMeshAtLevel(lev)) ; mcf.checkConsistencyLight()
 117                                 mergeField.appendFieldNoProfileSBT(mcf)
 118                                 pass
 119                         pass
 120                 mergeMLFields.pushField(mergeField)
 121                 pass
 122         mergeMLMesh.write("merge.med",2)
 123         mergeMLFields.write("merge.med",0)