2 .. _python_testMEDLoaderAdvancedAPI1_solution:
4 Reading, Writing a MED file using MEDLoader advanced API
5 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 from MEDLoader import MEDLoader
12 targetCoords = [-0.3,-0.3, 0.2,-0.3, 0.7,-0.3, -0.3,0.2, 0.2,0.2, 0.7,0.2, -0.3,0.7, 0.2,0.7, 0.7,0.7 ]
13 targetConn = [0,3,4,1, 1,4,2, 4,5,2, 6,7,4,3, 7,8,5,4]
14 targetMesh = ml.MEDCouplingUMesh("MyMesh",2)
15 targetMesh.allocateCells(5)
16 targetMesh.insertNextCell(ml.NORM_TRI3,3,targetConn[4:7])
17 targetMesh.insertNextCell(ml.NORM_TRI3,3,targetConn[7:10])
18 targetMesh.insertNextCell(ml.NORM_QUAD4,4,targetConn[0:4])
19 targetMesh.insertNextCell(ml.NORM_QUAD4,4,targetConn[10:14])
20 targetMesh.insertNextCell(ml.NORM_QUAD4,4,targetConn[14:18])
21 targetMesh.finishInsertingCells()
22 myCoords = ml.DataArrayDouble(targetCoords,9,2)
23 myCoords.setInfoOnComponents(["X [km]","YY [mm]"])
24 targetMesh.setCoords(myCoords)
25 # Build the 2D faces from the 3D volumes (descending connectivity)
26 targetMeshConsti, _, _, _, _ = targetMesh.buildDescendingConnectivity()
27 targetMesh1 = targetMeshConsti[[3,4,7,8]]
28 targetMesh1.setName(targetMesh.getName())
32 meshMEDFile = ml.MEDFileUMesh()
33 meshMEDFile.setMeshAtLevel(0,targetMesh)
34 meshMEDFile.setMeshAtLevel(-1,targetMesh1)
35 # Some groups on cells Level 0
36 grp0_0 = ml.DataArrayInt([0,1,3])
37 grp0_0.setName("grp0_Lev0")
38 grp1_0 = ml.DataArrayInt([1,2,3,4])
39 grp1_0.setName("grp1_Lev0")
40 meshMEDFile.setGroupsAtLevel(0, [grp0_0,grp1_0])
41 # Some groups on cells Level -1
42 grp0_M1 = ml.DataArrayInt([0,1])
43 grp0_M1.setName("grp0_LevM1")
44 grp1_M1 = ml.DataArrayInt([0,1,2])
45 grp1_M1.setName("grp1_LevM1")
46 grp2_M1 = ml.DataArrayInt([1,2,3])
47 grp2_M1.setName("grp2_LevM1")
48 meshMEDFile.setGroupsAtLevel(-1,[grp0_M1,grp1_M1,grp2_M1])
50 meshMEDFile.write("TargetMesh2.med",2) # 2 stands for write from scratch
51 # Re-read and test equality
52 meshMEDFileRead = ml.MEDFileMesh.New("TargetMesh2.med") # a new is needed because it returns a MEDFileUMesh (MEDFileMesh is abstract)
53 meshRead0 = meshMEDFileRead.getMeshAtLevel(0)
54 meshRead1 = meshMEDFileRead.getMeshAtLevel(-1)
55 print "Is level 0 in the file equal to 'targetMesh'?", meshRead0.isEqual(targetMesh,1e-12)
56 print "Is level 0 in the file equal to 'targetMesh1'?", meshRead1.isEqual(targetMesh1,1e-12)
58 print meshMEDFileRead.getGrpNonEmptyLevels("grp0_Lev0")
59 grp0_0_read = meshMEDFileRead.getGroupArr(0,"grp0_Lev0")
60 print "Is group 'grp0_Lev0' equal to what is read in the file?" , grp0_0_read.isEqual(grp0_0)
64 f = ml.MEDCouplingFieldDouble(ml.ON_CELLS, ml.ONE_TIME)
66 f.setArray(targetMesh.getBarycenterAndOwner())
68 f.setName("AFieldName")
69 # Prepare field for writing
70 fMEDFile = ml.MEDFileField1TS()
71 fMEDFile.setFieldNoProfileSBT(f) # No profile desired on the field, Sort By Type
72 # *Append* the field to an existing file
73 fMEDFile.write("TargetMesh2.med",0) # 0 is very important here because we want to append to TargetMesh2.med and not to scratch it
75 fMEDFileRead = ml.MEDFileField1TS("TargetMesh2.med",f.getName(),7,8)
76 fRead1 = fMEDFileRead.getFieldOnMeshAtLevel(ml.ON_CELLS,0,meshMEDFileRead) # Quickest way, not re-reading mesh in the file.
77 fRead2 = fMEDFileRead.getFieldAtLevel(ml.ON_CELLS,0) # Like above, but this time the mesh is read!
78 print "Does the field remain OK with the quick method?", fRead1.isEqual(f,1e-12,1e-12)
79 print "Does the field remain OK with the slow method?", fRead2.isEqual(f,1e-12,1e-12)
81 # Writing and Reading fields on profile using MEDLoader advanced API
83 pfl = ml.DataArrayInt([1,2,3])
84 pfl.setName("My1stPfl")
85 fPart = f.buildSubPart(pfl)
86 fPart.setName("fPart")
88 fMEDFile2 = ml.MEDFileField1TS()
89 fMEDFile2.setFieldProfile(fPart,meshMEDFileRead,0,pfl) # 0 is the relative level (here 0 means 3D)
90 fMEDFile2.write("TargetMesh2.med",0) # 0 is paramount to indicate that we *append* (and no overwrite) to the MED file
92 fMEDFileRead2 = ml.MEDFileField1TS("TargetMesh2.med",fPart.getName(),7,8)
93 fPartRead, pflRead = fMEDFileRead2.getFieldWithProfile(ml.ON_CELLS,0,meshMEDFileRead)
94 print "Is the partial field correclty read?", fPartRead.isEqualWithoutConsideringStr(fPart.getArray(),1e-12)
95 print "Is the list of cell identifiers matching?", pflRead.isEqualWithoutConsideringStr(pfl)