How to make a binary sequence bit with given key?

Hi I have a key (ex: key=1234;) how i create a binary sequence bit whose length is 1000 with this key?

Answer 1

[Walter Roberson]

Convert the key to binary. repmat() that as many times as will fit in a vector of length 1000. Fill the remainder of the 1000 with binary 0's.

[Pham Ngoc Thanh]

thanks you a lot

[Pham Ngoc Thanh]

dear Walter Roberdon Thank for your help but now i have a proplem, please help me again

 i have
key = 1234;
bit_sequence = dec2bin(key);
how i convert bit_sequence = 10011010010 to A = [1 0 0 1 1 0 1 0 0 1 0]

[Walter Roberson]

Do you mean Ӓ, capital A with two dots, Unicode position (decimal) 1234 ? Or do you mean just capital A ?

If you mean Ӓ, capital A with two dots then

vec = [1 0 0 1 1 0 1 0 0 1 0];   %you have the vector somehow
char(bin2dec(char('0' + vec)))

and the reverse would be

ch = char(1234);   %you already have the character somehow
dec2bin(ch) - '0'