MATLAB: Matrix for two variables

Question

I have 2 variables, a and b with respective values 1.123456789 and 3.123456789. Please help me to generate the matrix for the possible combination based on the formula 2^n, n = integer number 1 to 50. E.g if n=3, the output should be a matrix of 8 by 3:

1.123456789  1.123456789   1.123456789
1.123456789   1.123456789   3.123456789
1.123456789   3.123456789  1.123456789
1.123456789   3.123456789  3.123456789
3.123456789  1.123456789   1.123456789
3.123456789  1.123456789   3.123456789
3.123456789  3.123456789  1.123456789
3.123456789  3.123456789  3.123456789

Answer 1

use function ff2n from Statistics Toolbox

n = 3;
a = [1.123456789 , 3.123456789];
ii = ff2n(n)+1;
out = a(ii);