one two three four

I have two strings stored in a variable

EG

A='HELLO'

B='TEST'

I want to repeat B to make it the same length as A

EG

A='HELLOWORLD'

B='TESTTESTTE'

[Guillaume]

Both A and B have changed length in your example so it's unclear why the final length is 10 characters when they started at 5 and 4 characters. It's also unclear why 'WORLD' has been added to A instead of any other combination of 5 characters.

[Guillaume]

If Thorsten hadn't posted an answer, I was going to close the question as it's a duplicate of https://www.mathworks.com/matlabcentral/answers/489791-repeat-the-value-of-a-variable-to-match-the-length-of-another-variable

Please don't waste people time by asking the same question twice.

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[Thorsten]

Replicate B such that is is as long or longer than A, then cut it to the length of A;

B = repmat(B, 1, ceil(numel(A)/numel(B)));
B = B(1:numel(A));