reading matlab binary files

[Khan, Irfan]

Hi

In an earlier email to the group Barry mentioned that if the matrix sizes are 
large, the output should be done in binary format and 
bin/matlab/PetscBinaryRead.m should be used to read the matrix into matlab. 

I have output the matrix in the following manner. 

       ierr   =  PetscViewerBinaryOpen(PETSC_COMM_WORLD, fname, 
FILE_MODE_WRITE, &viewer);
       ierr   =  PetscObjectSetName((PetscObject)obj.Amat,"Stiffness_matrix");
       ierr   =  MatView(obj.Amat,viewer);

I don't get any error messages during execution. However, when I have not been 
successful reading the matrix into matlab. Presently I get the following error 
messages.



??? Error using ==> fread
Invalid file identifier.  Use fopen to generate a valid file identifier.

Error in ==> PetscOpenFile.read at 5
d = fread(freader.fd,count,datatype);

Error in ==> PetscBinaryRead at 49
  header = read(fd,1,'int32');


Any suggestions to solve the problem?

Thanks
Irfan