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