reading matlab binary files

[Barry Smith]

   Irfan,

    Make sure you use the absolutely latest PETSc patches version.  
There were some problems that we just recently fixed.
If that does not solve the problem send the binary file to petsc-maint at mcs.anl.gov

    Barry

On Feb 20, 2009, at 10:51 AM, Khan, Irfan wrote:

> 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