Problem while writing the file

Hello,
    I have tried this code on Modelsim, but it is not writing the file
in readable form.
some symbols r there.........
    Please help out





library ieee,STD;
USE IEEE.STD_LOGIC_ARITH.ALL;
use ieee.std_logic_1164.ALL;
use ieee.std_logic_unsigned.ALL;
USE STD.TEXTIO.ALL;
USE IEEE.STD_LOGIC_TEXTIO.ALL;
entity mat_add is

end mat_add;

architecture matadd1 of mat_add is
    type subchar is('s','t');
    type matrix is array(POSITIVE range 1 to 3,NATURAL range 1 to 3)
of integer;
    type matrix_out is file of integer;
    subtype NATURAL is INTEGER range 0 to INTEGER'HIGH;
    subtype POSITIVE is INTEGER range 1 to INTEGER'HIGH;
    SIGNAL k : integer ;
    SIGNAL    clock     : BIT := '0';
    file matout : matrix_out
    open WRITE_MODE is "E:\shweta\extra\RCS card\examples\matout.txt";
    begin
        clock <= not(clock)after 10 ns;
        process
            VARIABLE i : INTEGER :=1;
            VARIABLE j : INTEG

ER :=1;
           -- FILE   outFile  : TEXT IS OUT "matout.txt";
            VARIABLE  outLine  : LINE;
            VARIABLE mat1 : matrix;
            VARIABLE mat2 :matrix;
            begin
             for i in 1 to 3 loop
             for j in 1 to 3 loop
                    mat1(i,j) := j+1 ;
                    mat2(i,j) := mat1(i,j);
                end loop;
             end loop;
              for i in 1 to 3 loop
                 for j in 1 to 3 loop
               -- WRITE(outLine, lineNumber, right, 3);
              WAIT UNTIL clock = '1' AND clock'EVENT;
                 --  WRITE(outLine, HT);
                   k <= mat2(i,j);
                  WRITE(matout,k);
                 end loop;
                end loop;
        END PROCESS;
end matadd1;