Need multi-dimension syntax help.

[Altera_Forum]

I have 2 2-dimension signals: 

 type signed_2d is array (0 to 7) of signed(13 downto 0); type signed_2dx2 is array (0 to 7) of signed(27 downto 0);  signal short_x: signed_2d; signal long_x: signed_2dx2;  Could someone show me how to point to the sub-elements of those signal please? For more obvious: I would like to signed-extend short_x and store it as long_x: long_y(0 to 7)(13 downto 0) <= short_x(0 to 7); <<=== the error is here :( long_y(0 to 7)(27 downto 14) <= (others => short_x(0 to 7)'high); and the error: Error (10381): VHDL Type Mismatch error at Normalized_LMS.vhd(47): indexed name returns a value whose type does not match "signed_2dx2", the type of the target expression

[Altera_Forum]

--- Quote Start ---  I have 2 2-dimension signals:  type signed_2d is array (0 to 7) of signed(13 downto 0); type signed_2dx2 is array (0 to 7) of signed(27 downto 0);  signal short_x: signed_2d; signal long_x: signed_2dx2;  Could someone show me how to point to the sub-elements of those signal please? For more obvious: I would like to signed-extend short_x and store it as long_x: long_y(0 to 7)(13 downto 0) <= short_x(0 to 7); <<=== the error is here :( long_y(0 to 7)(27 downto 14) <= (others => short_x(0 to 7)'high); and the error: Error (10381): VHDL Type Mismatch error at Normalized_LMS.vhd(47): indexed name returns a value whose type does not match "signed_2dx2", the type of the target expression  --- Quote End ---     signal long_y : signed_2dx2 process(short_x) begin for i in 0 to 7 loop long_y(i) <= resize(short_x(i),28); end loop; end process;