PetscOptionsGetString
Date: 2013-07-02

    function
       petsc-3.4.2 2013-07-02 string = PetscOptionsGetString(prefix,name)
    %
    %   Returns a string from the options database
    %
    %  Developer notes: I could not figure out a good way to return a character string from a C program
    %  except by listing it explicitly as the returned type
    if (nargin == 1)
      name = prefix;
      prefix = '';
    end
    string = calllib('libpetsc', 'PetscOptionsGetStringMatlab',prefix,name);