1: function closeport(port)
  2: %
  3: %   closeport(port)
  4: %   Closes a PETSc port opened with openport()
  5: %see openport, receive
  6: disp('You must build the closeport mex file by doing: cd ${PETSC_DIR}/src/sys/src/viewer/impls/socket/matlab; make BOPT=g matlabcodes')