signal statement must use <= to assign value to signal - vhdl

Question

I've got this error in the expression "individuos(x):=cout" of the following code. What I'm trying to do is assign to each array of individuos a different random "cout" input sequentially. If I change the expression to "individuos <= cout", it'll asign the same "cout" to all "individuos", the same will happen if i trie to build a sequential statement with the assert function. How do I fix this?
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_TEXTIO.ALL;
use ieee.numeric_std.all;
--package genetica_type is
--type genetica is array(0 to 49) of unsigned(7 downto 0);
--type fitness is array(0 to 49) of unsigned (2 downto 0);
--end package genetica_type;
use work.genetica_type.all;
entity conexao is
Port (
clk : in bit;
cout: in unsigned (7 downto 0);
individuos: out genetica
);
end entity;
architecture Behavioral of conexao is
--type genetica is array (0 to 49) of std_logic_vector (7 downto 0);
--signal s_individuos : genetica;
--signal i: genetica;
begin
process (clk)
begin
If (clk 'event and clk = '1') then
for x in 0 to 49 loop
individuos(x) := cout;
end loop;
end if ;
end process;
end Behavioral;

Answer 1

I've got this error in the expression "individuos(x):=cout" of the following code.
That is a syntax error. Use <= exactly as the compiler says.
What I'm trying to do is assign to each array of individuos a different random "cout" input sequentially. If I change the expression to "individuos <= cout", it'll asign the same "cout" to all "individuos"
That is exactly what you ask it to do :
If (clk 'event and clk = '1') then
for x in 0 to 49 loop
individuos(x) <= cout;
end loop;
end if ;
On every rising clock edge, loop 50x performing 50 assignments, each of the same data, to all 50 addresses.
What I think you want to do, is, on every clock, perform ONE assignment, and increment the address to point to the next location.
signal x : natural range 0 to individuos'high;
...
if rising_edge(clk) then
individuos(x) <= cout;
x <= x + 1 mod individuos'length;
end if;
This code has several other differences from yours:
It uses the simpler rising_edge(clk) function
It will still work when you change the size of the input array.
It still has a bug : if you change the array lower bound to something other than 0, it will fail... for example:
type genetica is array(3 to 49) of ...
Easy to catch this with an assert:
Assert individuos'low = 0 report "Array Individuos bound error" severity failure;
It also runs continuously. If you want to start and stop it, or reset the address counter, or stop when it reaches 50, that takes additional logic.