Hi Lauren, thanks for the answer. Your idea works, but I need a more generous version:
I have to extract the rows from a 2D-array, compute the arithmetic average of each row and add this value as a seventh column. Finaly I merge the rows together again to one 2D-array and save it to a txt-file. By the way, it won't have three rows, but more than 20. The VI should count the number of needed rows by itself. Perhaps someone can help me now. Arno
