At a university, students fill out evaluation forms on which the scale is 1 to 5. One is supposed to be the best and 5 the worst. However, on the form, the scale was reversed so that 1 was the worst and 5 the best. All of the computer programs that deal with these data expect it to be the other way. So, the data need to be 'reversed'. For example, if a vector of evaluation results is: original = [5 3 2 5 5 4 1 2] it should really be [1 3 4 1 1 2 5 4].