Under screen editing all elements in the current “block” of the internal matrix are “dumped” to the screen and may be altered as desired.
On exit from the screen edit cell values in the internal matrix are replaced by those on the screen.
Instructions as to how to use screen editing are given in Section 19.8. Note in particular that the screen constitutes a formatted data set so that changing the position of any data item on a line or adding/deleting lines may lead to cells being mixed up on return.
Note as well that the row and column integer headers are for information only and may not be “edited”.