how to make a list of stringes for box plot

str1='G7f'; str2='XCaMP'; group=[repmat({str1},3,1);repmat({str2},3,1)]; result is: 'G7f' 'G7f' 'G7f' 'XCaMP' 'XCaMP' 'XCaMP' However, if you use group=[repmat(str1,3,1),repmat(str2,3,1)]; the result will be 'G7fXCaMP' 'G7fXCaMP' 'G7fXCaMP'