src/MEDLoader/Swig/CaseReader.py

   1 #  -*- coding: iso-8859-1 -*-
   2 # Copyright (C) 2007-2024  CEA, EDF
   3 #
   4 # This library is free software; you can redistribute it and/or
   5 # modify it under the terms of the GNU Lesser General Public
   6 # License as published by the Free Software Foundation; either
   7 # version 2.1 of the License, or (at your option) any later version.
   8 #
   9 # This library is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 # Lesser General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU Lesser General Public
  15 # License along with this library; if not, write to the Free Software
  16 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  17 #
  18 # See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
  19 #
  20 # Author : Anthony GEAY (CEA/DEN/DM2S/STMF/LGLS)
  21
  22 # http://www-vis.lbl.gov/NERSC/Software/ensight/doc/OnlineHelp/UM-C11.pdf
  23 import numpy as np
  24 from medcoupling import *
  25 from CaseIO import CaseIO
  26 import sys,re,os
  27
  28 class CaseReader(CaseIO):
  29     """ Converting a file in the Case format (Ensight) to the MED format.
  30     A new file with the same base name and the .med extension is created.
  31     """
  32
  33     @classmethod
  34     def New(cls,fileName):
  35         """ Static constructor. """
  36         return CaseReader(fileName)
  37         pass
  38
  39     def __init__(self,fileName):
  40         """ Constructor """
  41         CaseIO.__init__(self)
  42         self._fileName=fileName
  43         self._dirName=os.path.dirname(self._fileName)
  44         pass
  45
  46     def __traduceMesh(self,name,typ,coords,cells):
  47         """ Convert a CASE mesh into a MEDCouplingUMesh. """
  48         name = name.decode("ascii")
  49         nbCoords=len(coords)
  50         coo=np.array(coords,dtype="float64") ; coo=coo.reshape(nbCoords,3)
  51         coo=DataArrayDouble(coo) ; coo=coo.fromNoInterlace()
  52         ct=self.dictMCTyp2[typ]
  53         m=MEDCouplingUMesh(name,MEDCouplingUMesh.GetDimensionOfGeometricType(ct))
  54         m.setCoords(coo)
  55         nbNodesPerCell=MEDCouplingMesh.GetNumberOfNodesOfGeometricType(ct)
  56         cI=DataArrayInt(len(cells)+1) ; cI.iota() ; cI*=nbNodesPerCell+1
  57         #
  58         cells2=cells.reshape(len(cells),nbNodesPerCell)
  59         c2=DataArrayInt(np.array(cells2,dtype="int{}".format(MEDCouplingSizeOfIDs())) )
  60         c=DataArrayInt(len(cells),nbNodesPerCell+1) ; c[:,0]=ct ; c[:,1:]=c2-1 ; c.rearrange(1)
  61         m.setConnectivity(c,cI,True)
  62         m.checkConsistency()
  63         return m
  64
  65     def __traduceMeshForPolyhed(self,name,coords,arr0,arr1,arr2):
  66         nbCoords=len(coords)
  67         coo=np.array(coords,dtype="float64") ; coo=coo.reshape(nbCoords,3)
  68         coo=DataArrayDouble(coo) ; coo=coo.fromNoInterlace()
  69         m=MEDCouplingUMesh(name,3)
  70         m.setCoords(coo)
  71         #
  72         arr2=arr2[:]-1
  73         arr0mc0=DataArrayInt(arr0) ; arr0mc0.computeOffsetsFull()
  74         arr0mc1=DataArrayInt(arr0).deepCopy()
  75         arr0mc2=DataArrayInt(len(arr0),2) ; arr0mc2[:,0]=DataArrayInt(arr0)-1 ; arr0mc2[:,1]=1 ; arr0mc2.rearrange(1) ; arr0mc2.computeOffsetsFull()
  76         arr0mc3=DataArrayInt.Range(0,2*len(arr0),2).buildExplicitArrByRanges(arr0mc2)
  77         arr1mc0=DataArrayInt(arr1) ; arr1mc0.computeOffsetsFull()
  78         arr1mc1=arr1mc0[arr0mc0] ; arr1mc1[1:]+=arr0mc0[1:]
  79         arr1mc2=DataArrayInt(arr1).deepCopy() ; arr1mc2+=1 ; arr1mc2.computeOffsetsFull()
  80         arr2mc0=(arr1mc2[1:])[arr0mc3]
  81         #
  82         c=DataArrayInt(arr1.size+arr2.size)
  83         c[arr1mc1[:-1]]=NORM_POLYHED
  84         c[arr2mc0]=-1
  85         a=arr2mc0.buildUnion(arr1mc1[:-1]).buildComplement(len(c))
  86         c[a]=DataArrayInt(arr2)
  87         #
  88         m.setConnectivity(c,arr1mc1,True)
  89         m.checkConsistency()
  90         return m
  91
  92     def __traduceMeshForPolygon(self,name,coords,arr0,arr1):
  93         nbCoords=len(coords)
  94         coo=np.array(coords,dtype="float64") ; coo=coo.reshape(nbCoords,3)
  95         coo=DataArrayDouble(coo) ; coo=coo.fromNoInterlace()
  96         m=MEDCouplingUMesh(name,2)
  97         m.setCoords(coo)
  98         #
  99         arr0_0=DataArrayInt(arr0+1) ; arr0_0.computeOffsetsFull()
 100         arr0_1=DataArrayInt(len(arr0),2) ; arr0_1[:,1]=DataArrayInt(arr0) ; arr0_1[:,0]=1 ; arr0_1.rearrange(1) ; arr0_1.computeOffsetsFull()
 101         arr0_2=DataArrayInt.Range(1,2*len(arr0),2).buildExplicitArrByRanges(arr0_1)
 102         c=DataArrayInt(len(arr0)+len(arr1)) ; c[:]=0 ; c[arr0_0[:-1]]=NORM_POLYGON
 103         c[arr0_2]=DataArrayInt(arr1-1)
 104         #
 105         m.setConnectivity(c,arr0_0,True)
 106         m.checkConsistency()
 107         return m
 108
 109     def __convertGeo2MED(self,geoFileName):
 110         """ Convert all the geometry (all the meshes) contained in the CASE file into MEDCouplingUMesh'es. """
 111         fd=open(os.path.join(self._dirName,geoFileName),"r+b") ; fd.seek(0,2) ; end=fd.tell() ; fd.seek(0) ; title=fd.read(80)
 112         title=title.strip().lower()
 113         if b"binary" not in title:
 114             raise Exception("Error only binary geo files are supported for the moment !")
 115             pass
 116         zeType=True
 117         if b"fortran" in title:
 118             mcmeshes=self.__convertGeo2MEDFortran(fd,end) ; zeType=False
 119         else:
 120             mcmeshes=self.__convertGeo2MEDC(fd,end)
 121         #
 122         ms=MEDFileMeshes()
 123         ms.resize(len(mcmeshes))
 124         for i,m in enumerate(mcmeshes):
 125             mlm=MEDFileUMesh()
 126             mlm.setMeshAtLevel(0,m)
 127             ms.setMeshAtPos(i,mlm)
 128             pass
 129         return mcmeshes,ms,zeType
 130
 131     def __convertGeo2MEDFortran(self,fd,end):
 132         mcmeshes=[]
 133         fd.read(80) # comment 1
 134         fd.read(80) # comment 2
 135         fd.read(80) # node id
 136         fd.read(80) # element id
 137         pos=fd.tell()
 138         elt=fd.read(80) ; elt=elt.strip() ; pos=fd.tell()
 139         mcmeshes2=[]
 140         typ=b"part"
 141         nbOfTurn=0
 142         while abs(pos-end)>8 and b"part" in typ:
 143             if b"part" not in elt:
 144                 raise Exception("Error on reading mesh fortran #1 !")
 145             fd.seek(fd.tell()+4)# skip #
 146             tmp=fd.read(80) ; meshName=tmp.split("P")[-1]
 147             tmp=fd.read(80)
 148             if b"coordinates" not in tmp:
 149                 raise Exception("Error on reading mesh fortran #2 !")
 150             pos=fd.tell() # 644
 151             if nbOfTurn==0:
 152                 pos+=76 # what else ?
 153             else:
 154                 pos+=40
 155                 pass
 156             nbNodes=np.memmap(fd,dtype='>i4',mode='r',offset=int(pos),shape=(1,)).tolist()[0]
 157             pos+=12 # what else ?
 158             a=np.memmap(fd,dtype='>f4',mode='r',offset=int(pos),shape=(nbNodes))
 159             b=np.memmap(fd,dtype='>f4',mode='r',offset=int(pos+nbNodes*4+2*4),shape=(nbNodes))
 160             c=np.memmap(fd,dtype='>f4',mode='r',offset=int(pos+nbNodes*2*4+4*4),shape=(nbNodes))
 161             coo=np.zeros(dtype=">f4",shape=(nbNodes*3))
 162             coo[:nbNodes]=a ; coo[nbNodes:2*nbNodes]=b ; coo[2*nbNodes:]=c
 163             coo=coo.reshape(nbNodes,3)
 164             pos+=nbNodes*3*4 ; fd.seek(pos)#np.array(0,dtype='float%i'%(typeOfCoo)).nbytes
 165             typ=fd.read(80).strip() ; pos=fd.tell()
 166             zeK=b""
 167             for k in self.dictMCTyp2:
 168                 if k in typ:
 169                     zeK=k
 170                     break
 171                     pass
 172                 pass
 173             pos+=8*4 # yeh man !
 174             nbCellsOfType=np.memmap(fd,dtype='>i4',mode='r',offset=int(pos),shape=(1,)).tolist()[0]
 175             pos+=4 # for the number of cells
 176             pos+=2*4 # because it's great !
 177             nbNodesPerCell=MEDCouplingMesh.GetNumberOfNodesOfGeometricType(self.dictMCTyp2[zeK])
 178             nodalConn=np.memmap(fd,dtype='>i4',mode='r',offset=pos,shape=(nbCellsOfType,nbNodesPerCell))
 179             meshName=meshName.strip()
 180             mcmeshes2.append(self.__traduceMesh(meshName,zeK,coo,nodalConn))
 181             pos+=nbNodesPerCell*nbCellsOfType*4
 182             if abs(pos-end)>8:
 183                 fd.seek(pos) ;elt=fd.read(80) ; typ=elt[:] ; pos+=80
 184                 pass
 185             nbOfTurn+=1
 186             pass
 187         #coo=mcmeshes2[0].getCoords() ; name=mcmeshes2[0].getName()
 188         #for itmesh in mcmeshes2: itmesh.setCoords(coo)
 189         #m=MEDCouplingUMesh.MergeUMeshesOnSameCoords(mcmeshes2) ; m.setName(name)
 190         #mcmeshes.append(m)
 191         return mcmeshes2
 192
 193     def __convertGeo2MEDC(self,fd,end):
 194         #fd.readline()
 195         #name=fd.readline().strip() ; fd.readline() ; fd.readline()
 196         name=fd.read(80)
 197         descrip=fd.read(80).strip() ; fd.read(80) ; fd.read(80)
 198         pos=fd.tell()
 199         mcmeshes=[]
 200         elt=fd.read(80) ; elt=elt.strip() ; pos+=80
 201         while pos!=end:
 202             if b"part" not in elt:
 203                 raise Exception("Error on reading mesh #1 !")
 204             fd.seek(fd.tell()+4)
 205             meshName=fd.read(80).strip()
 206             if fd.read(len("coordinates"))!=b"coordinates":
 207                 raise Exception("Error on reading mesh #2 !")
 208             pos=fd.tell()
 209             typeOfCoo=np.memmap(fd,dtype='byte',mode='r',offset=int(pos),shape=(1)).tolist()[0]
 210             pos+=1+17*4
 211             nbNodes=np.memmap(fd,dtype='int32',mode='r',offset=int(pos),shape=(1,)).tolist()[0]
 212             pos+=4
 213             coo=np.memmap(fd,dtype='float32',mode='r',offset=int(pos),shape=(nbNodes,3))
 214             pos+=nbNodes*3*4 ; fd.seek(pos)#np.array(0,dtype='float%i'%(typeOfCoo)).nbytes
 215             typ=fd.read(80).strip() ; pos=fd.tell()
 216             mcmeshes2=[]
 217             while pos!=end and typ!=b"part":
 218                 if typ[0]==0: pos+=1; continue
 219                 mctyp=self.dictMCTyp2[typ]
 220                 nbCellsOfType=np.memmap(fd,dtype='int32',mode='r',offset=int(pos),shape=(1,)).tolist()[0]
 221                 pos+=4
 222                 if mctyp!=NORM_POLYHED and mctyp!=NORM_POLYGON:
 223                     nbNodesPerCell=MEDCouplingMesh.GetNumberOfNodesOfGeometricType(mctyp)
 224                     cells=np.memmap(fd,dtype='int32',mode='r',offset=pos,shape=(nbCellsOfType,nbNodesPerCell))
 225                     pos+=nbCellsOfType*nbNodesPerCell*4
 226                     fd.seek(pos)
 227                     mcmeshes2.append(self.__traduceMesh(meshName,typ,coo,cells))
 228                 elif mctyp==NORM_POLYHED:
 229                     nbOfFacesPerCell=np.memmap(fd,dtype='int32',mode='r',offset=int(pos),shape=(nbCellsOfType,))
 230                     pos+=nbCellsOfType*4
 231                     szOfNbOfNodesPerFacePerCellArr=int(nbOfFacesPerCell.sum())
 232                     arr1=np.memmap(fd,dtype='int32',mode='r',offset=int(pos),shape=(szOfNbOfNodesPerFacePerCellArr,))#arr1 -> nbOfNodesPerFacePerCellArr
 233                     pos+=szOfNbOfNodesPerFacePerCellArr*4
 234                     szOfNodesPerFacePerCellArr=arr1.sum()
 235                     arr2=np.memmap(fd,dtype='int32',mode='r',offset=int(pos),shape=(szOfNodesPerFacePerCellArr,))#arr2 -> nodesPerFacePerCellArr
 236                     pos+=szOfNodesPerFacePerCellArr*4 ; fd.seek(pos)
 237                     mcmeshes2.append(self.__traduceMeshForPolyhed(meshName,coo,nbOfFacesPerCell,arr1,arr2))
 238                     pass
 239                 else:
 240                     nbOfNodesPerCell=np.memmap(fd,dtype='int32',mode='r',offset=int(pos),shape=(nbCellsOfType,))
 241                     pos+=nbCellsOfType*4
 242                     szOfNbOfNodesPerCellArr=int(nbOfNodesPerCell.sum())
 243                     arr1=np.memmap(fd,dtype='int32',mode='r',offset=int(pos),shape=(szOfNbOfNodesPerCellArr,))
 244                     pos+=szOfNbOfNodesPerCellArr*4  ; fd.seek(pos)
 245                     mcmeshes2.append(self.__traduceMeshForPolygon(meshName,coo,nbOfNodesPerCell,arr1))
 246                 if pos!=end:
 247                     elt=fd.read(80) ; elt=elt.strip() ; typ=elt[:] ; pos+=80
 248                     pass
 249                 pass
 250             if mcmeshes2:
 251                 coo=mcmeshes2[0].getCoords() ; name=mcmeshes2[0].getName()
 252                 for itmesh in mcmeshes2: itmesh.setCoords(coo)
 253                 m=MEDCouplingUMesh.MergeUMeshesOnSameCoords(mcmeshes2) ; m.setName(name)
 254                 mcmeshes.append(m)
 255             pass
 256         return mcmeshes
 257
 258
 259     def __convertField(self,mlfields, mcmeshes, fileName, fieldName, discr, nbCompo, locId, it):
 260         """ Convert the fields. """
 261         stars=re.search("[\*]+",fileName).group()
 262         st="%0"+str(len(stars))+"i"
 263         trueFileName=fileName.replace(stars,st%(it))
 264         fd=open(os.path.join(self._dirName,trueFileName),"r+b") ; fd.seek(0,2) ; end=fd.tell() ; fd.seek(0)
 265         name=fd.read(80).strip().split(b" ")[0].decode("ascii")
 266         if name!=fieldName:
 267             raise Exception("ConvertField : mismatch")
 268         pos=fd.tell()
 269         st=fd.read(80) ; st=st.strip() ; pos=fd.tell()
 270         while pos!=end:
 271             if st!=b"part":
 272                 raise Exception("ConvertField : mismatch #2")
 273             fdisc=MEDCouplingFieldDiscretization.New(self.discSpatial2[discr])
 274             meshId=np.memmap(fd,dtype='int32',mode='r',offset=int(pos),shape=(1)).tolist()[0]-1
 275             if meshId >= len( mcmeshes ):
 276                 return
 277             nbOfValues=fdisc.getNumberOfTuples(mcmeshes[meshId])
 278             vals2=DataArrayDouble(nbOfValues,nbCompo)
 279             fd.seek(pos+4)
 280             st=fd.read(80).strip() ; pos=fd.tell()
 281             offset=0
 282             while pos!=end and st!=b"part":
 283                 if st!=b"coordinates":
 284                     nbOfValsOfTyp=mcmeshes[meshId].getNumberOfCellsWithType(self.dictMCTyp2[st])
 285                 else:
 286                     nbOfValsOfTyp=nbOfValues
 287                     pass
 288                 vals=np.memmap(fd,dtype='float32',mode='r',offset=int(pos),shape=(nbOfValsOfTyp,nbCompo))#np.memmap(fd,dtype='int32',mode='r',offset=159,shape=(1))
 289                 vals2[offset:offset+nbOfValsOfTyp]=DataArrayDouble(np.array(vals,dtype='float64')).fromNoInterlace()
 290                 pos+=nbOfValsOfTyp*nbCompo*4 ; fd.seek(pos)
 291                 st=fd.read(80) ; st=st.strip() ; pos=fd.tell()
 292                 offset+=nbOfValsOfTyp
 293                 pass
 294             f=MEDCouplingFieldDouble(self.discSpatial2[discr],ONE_TIME) ; f.setName("%s_%s"%(fieldName,mcmeshes[meshId].getName()))
 295             f.setMesh(mcmeshes[meshId]) ; f.setArray(vals2) ; f.setTime(float(it),it,-1)
 296             f.checkConsistencyLight()
 297             mlfields[locId+meshId].appendFieldNoProfileSBT(f)
 298             pass
 299
 300     def __convertFieldFortran(self,mlfields, mcmeshes, fileName, fieldName, discr, nbCompo, locId, it):
 301         """ Convert the fields. """
 302         if re.search("[\*]+",fileName):
 303             stars=re.search("[\*]+",fileName).group()
 304             st="%0"+str(len(stars))+"i"
 305             trueFileName=fileName.replace(stars,st%(it))
 306             pass
 307         else:
 308             trueFileName=fileName
 309             pass
 310         fd=open(os.path.join(self._dirName,trueFileName),"r+b") ; fd.seek(0,2) ; end=fd.tell() ; fd.seek(0)
 311         name=fd.read(80)
 312         if fieldName not in name:
 313             raise Exception("ConvertField : mismatch")
 314         pos=fd.tell()
 315         st=fd.read(80) ; st=st.strip() ; pos=fd.tell()
 316         if b"part" not in st:
 317             raise Exception("ConvertField : mismatch #2")
 318         st=fd.read(80).strip() ; pos=fd.tell()
 319         pos+=12 # I love it
 320         offset=0
 321         nbTurn=0
 322         while pos!=end and b"part" not in st:
 323             fdisc=MEDCouplingFieldDiscretization.New(self.discSpatial2[discr])
 324             nbOfValues=fdisc.getNumberOfTuples(mcmeshes[nbTurn])
 325             vals2=DataArrayDouble(nbOfValues,nbCompo)
 326             pos+=24 # I love it again !
 327             nbOfValsOfTyp=np.memmap(fd,dtype='>i4',mode='r',offset=pos,shape=(1)).tolist()[0]/4
 328             pos+=4
 329             vals=np.zeros(dtype=">f4",shape=(nbOfValsOfTyp*nbCompo))
 330             for iii in range(nbCompo):
 331                 valsTmp=np.memmap(fd,dtype='>f4',mode='r',offset=int(pos),shape=(nbOfValsOfTyp))
 332                 vals[iii*nbOfValsOfTyp:(iii+1)*nbOfValsOfTyp]=valsTmp
 333                 pos+=nbOfValsOfTyp*4
 334                 pos+=2*4 ## hey hey, that is the ultimate class !
 335                 vals2.setInfoOnComponent(iii,chr(ord('X')+iii))
 336                 pass
 337             if pos>end:
 338                 pos=end
 339                 pass
 340             vals=vals.reshape(nbOfValsOfTyp,nbCompo)
 341             vals2[offset:offset+nbOfValsOfTyp]=DataArrayDouble(np.array(vals,dtype='float64')).fromNoInterlace()
 342             if pos!=end:
 343                 fd.seek(pos)
 344                 st=fd.read(80) ; st=st.strip() ; pos=fd.tell()
 345                 st=fd.read(80) ; st=st.strip() ; pos=fd.tell()
 346                 pass
 347             f=MEDCouplingFieldDouble(self.discSpatial2[discr],ONE_TIME) ; f.setName("%s_%s"%(fieldName,mcmeshes[nbTurn].getName()))
 348             f.setMesh(mcmeshes[nbTurn]) ; f.setArray(vals2) ; f.setTime(float(it),it,-1)
 349             f.checkConsistencyLight()
 350             mlfields[locId+nbTurn].appendFieldNoProfileSBT(f)
 351             nbTurn+=1
 352             pass
 353         pass
 354
 355     def loadInMEDFileDS(self):
 356         """ Load a CASE file into a MEDFileData object. """
 357         f=open(self._fileName)
 358         lines=f.readlines()
 359         ind=lines.index("GEOMETRY\n")
 360         if ind==-1:
 361             raise Exception("Error with file %s"%(fname))
 362         geoName=re.match("model:([\W]*)([\w\.]+)",lines[ind+1]).group(2)
 363         m1,m2,typeOfFile=self.__convertGeo2MED(geoName)
 364         fieldsInfo=[] ; nbOfTimeSteps=0
 365         if "VARIABLE\n" in lines:
 366             ind=lines.index("VARIABLE\n")
 367             end=len(lines)-1
 368             if "TIME\n" in lines:
 369                 end=lines.index("TIME\n")
 370                 pass
 371             for i in range(ind + 1,end):
 372                 m=re.match("^([\w]+)[\s]+per[\s]+([\w]+)[\s]*\:[\s]*[0-9]*[\s]*([\w]+)[\s]+([\S]+)$",lines[i])
 373                 if m:
 374                     if m.groups()[0]=="constant":
 375                         continue
 376                     spatialDisc=m.groups()[1] ; fieldName=m.groups()[2] ; nbOfCompo=self.dictCompo2[m.groups()[0]] ; fieldFileName=m.groups()[3]
 377                     if "*" in fieldFileName:
 378                       fieldsInfo.append((fieldName,spatialDisc,nbOfCompo,fieldFileName))
 379                     pass
 380                 pass
 381
 382             expr=re.compile("number[\s]+of[\s]+steps[\s]*\:[\s]*([\d]+)")
 383             tmp = [line for line in lines if expr.search(line)]
 384             if tmp:
 385                 nbOfTimeSteps = int(expr.search(tmp[0]).group(1))
 386                 expr=re.compile("filename[\s]+start[\s]+number[\s]*\:[\s]*([\d]+)")
 387                 startIt = int(expr.search([line for line in lines if expr.search(line)][0]).group(1))
 388                 expr=re.compile("filename[\s]+increment[\s]*\:[\s]*([\d]+)")
 389                 incrIt = int(expr.search([line for line in lines if expr.search(line)][0]).group(1))
 390             else:
 391                 nbOfTimeSteps=1
 392                 startIt=0
 393                 incrIt=1
 394                 pass
 395             curIt=startIt
 396             pass
 397         mlfields=MEDFileFields()
 398         mlfields.resize(len(fieldsInfo)*len(m1))
 399         i=0
 400         for field in fieldsInfo:
 401             for m in m1:
 402                 mlfields.setFieldAtPos(i,MEDFileFieldMultiTS())
 403                 i+=1
 404                 pass
 405             pass
 406         for ts in range(nbOfTimeSteps):
 407             i=0
 408             for field in fieldsInfo:
 409                 if typeOfFile:
 410                     self.__convertField(mlfields,m1,field[3],field[0],field[1],field[2],i,curIt);
 411                 else:
 412                     self.__convertFieldFortran(mlfields,m1,field[3],field[0],field[1],field[2],i,curIt)
 413                     pass
 414                 i+=len(m1)
 415                 pass
 416             curIt+=incrIt
 417             pass
 418         ret=MEDFileData()
 419         ret.setMeshes(m2)
 420         del mlfields[[x for x in range(len(mlfields)) if len(mlfields[x]) == 0]]
 421         ret.setFields(mlfields)
 422         return ret
 423
 424     pass