Source: dataset/matrix/matrix_dataset__set_layout.pro
matrix_dataset::set_layout Select whether to add a header to matrix datasets. Usage: dsref -> set_layout, <keys> Keywords: with_header If set, then add a header. no_header If set then dont add a header. Notes: with_header=0 is equivalent to /no_header. History: Original: 16/6/00; SJT