It has been said by someone more knowledgable than I that:
A critical property of the 'matrix' construct is that elements in a row are aligned, which is not necessarily true in a sequence of piles. The point is that vertical spacing in columns is adjusted in concert, ..... I am not convinced that EQN does this very well currently. See the attached. When I have two entries in the same row, one 0 and the other a term like { partial x } over { partial r } which have a big height difference, they are poorly spaced vertically. See my example matrix A (both troff & PDF) for the problem matrix.The matrix B is better aligned but I had to seriously mess with fake (unpadded space) subscripts and superscripts to achieve this.
The example C tries to imitate the spacing this is expected in A. It is the same with either -ms or -mm. Is this urgent? Probably not. Thanks - Damian
matrix.pdf
Description: Adobe PDF document
matrix.ms
Description: Troff MS-macros document