create a new pattern with a string

i have a string pattern as below of length 24

 str1 = 'AAAAAABBBBBBCCCCCCDDDDDD'

now i want to create a new pattern from the str1 with the length i give,

if i give length of new pattern as 72 answer should be

str2 = 'AAAAAABBBBBBCCCCCCDDDDDDAAAAAABBBBBBCCCCCCDDDDDDAAAAAABBBBBBCCCCCCDDDDDD'

that is it should repeat pattern in str1 upto the limit i want

if i give 84 answer should be

str3 = 'AAAAAABBBBBBCCCCCCDDDDDDAAAAAABBBBBBCCCCCCDDDDDDAAAAAABBBBBBCCCCCCDDDDDDAAAAAABBBBBB'

[darshana alaiya]

I want matrix with repeated pattern in 1st 3rd and 5th row.

for eg. 1 18 25 0 0 0 0 0 0

3 23 27 0 0 0 0 0 0

0 0 0 5 28 29 0 0 0

0 0 0 7 33 31 0 0 0

so on...

Answer 1

[Andrei Bobrov]

m = 84;

[s,~,c] = unique(str1,'stable');
n = numel(c);
out = s(c(rem(0:m-1,n)+1));

or

m = 84;

k = repmat(str1,1,ceil(m/numel(str1)));
out = k(1:m);

Answer 2

[Walter Roberson]

temp = repmat(str1, ceil(Count/length(str1))) ;
str3 = temp(1:Count);

[Walter Roberson]

 temp = repmat(str1, 1, ceil(Count/length(str1))) ;
str3 = temp(1:Count);

[Andrei Bobrov]

+1