It would be nice if the error message could be related to the VecLoad() call so the error message could say that there is no vector next in the file.

[d3m956@olympus tutorials]$ ./ex12 -f0 myA.dat

This program expects a matrix followed by a vector in the file. You can use -rhs 0 to skip reading the right hand side vector from the file, it will use a vector of all ones.

[0]PETSC ERROR: --------------------- Error Message ------------------------------------ [0]PETSC ERROR: Read from file failed! [0]PETSC ERROR: Read past end of file! [0]PETSC ERROR: ------------------------------------------------------------------------ [0]PETSC ERROR: Petsc Release Version 3.3.0, Patch 0, Tue Jun 5 14:20:42 CDT 2012 [0]PETSC ERROR: See docs/changes/index.html for recent updates. [0]PETSC ERROR: See docs/faq.html for hints about trouble shooting. [0]PETSC ERROR: See docs/index.html for manual pages. [0]PETSC ERROR: ------------------------------------------------------------------------ [0]PETSC ERROR: ./ex12 on a arch-linu named olympus.local by d3m956 Tue Jun 26 13:51:28 2012 [0]PETSC ERROR: Libraries linked from /pic/projects/mca/ss/PETSC/petsc-3.3-p0/arch-linux2-c-debug/lib [0]PETSC ERROR: Configure run at Thu Jun 14 17:00:19 2012 [0]PETSC ERROR: Configure options --with-cc=gcc --with-fc=gfortran --download-f-blas-lapack --download-mpich [0]PETSC ERROR: ------------------------------------------------------------------------ [0]PETSC ERROR: PetscBinaryRead() line 271 in src/sys/fileio/sysio.c [0]PETSC ERROR: PetscBinarySynchronizedRead() line 558 in src/sys/fileio/sysio.c [0]PETSC ERROR: PetscViewerBinaryRead() line 764 in src/sys/viewer/impls/binary/binv.c [0]PETSC ERROR: PetscViewerBinaryReadVecHeader_Private() line 24 in src/vec/vec/utils/vecio.c [0]PETSC ERROR: VecLoad_Binary() line 97 in src/vec/vec/utils/vecio.c [0]PETSC ERROR: VecLoad_Default() line 348 in src/vec/vec/utils/vecio.c [0]PETSC ERROR: VecLoad() line 1111 in src/vec/vec/interface/vector.c [0]PETSC ERROR: main() line 92 in src/mat/examples/tutorials/ex12.c

It said “Read from file failed! Read past end of file!” Anything wrong? I was using the example code without changing anything. Please help me to figure out the problem.

Thanks, Shuangshuang