ベクトルで行列を埋めたい，もしくは行列で行列を埋めたい時．
MatB = repmat(MatA, m, n)
MatB のサイズは [size(MatA,1) * m, size(MatA, 2) * n]
例
>> MatA = [1;2;3]
MatA =
1
2
3
>> MatB = repmat(MatA, 3, 2)
MatB =
1 1
2 2
3 3
1 1
2 2
3 3
1 1
2 2
3 3
>> MatA = [1, 2, 3]
MatA =
1 2 3
>> MatB = repmat(MatA, 3, 2)
MatB =
1 2 3 1 2 3
1 2 3 1 2 3
1 2 3 1 2 3
