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/usr/lib/petscdir/3.7.5/x86_64-linux-gnu-complex/share/petsc/matlab/@PetscOpenFile/PetscOpenFile.m is in libpetsc-complex-3.7.5-dev 3.7.5+dfsg1-4+b1.

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function O = PetscOpenFile(filename,rw)
%
  %   O = PetscOpenFile(filename,rw) - opens the binary file (generated by PETSc for reading) or for writing
%
%  This provides an object oriented interface to the Matlab routines fopen(), fread() and fclose()
%  allowing PETSc  Matlab utilities like PetscBinaryRead.m to work cleanly with either binary
%  files or sockets
%
if nargin == 1
  rw = 'r';
end
S = struct('fd', fopen(filename,rw,'ieee-be'));
O = class(S,'PetscOpenFile');