This particular feature of GAUSS causes a number of unexpected problems, particularly

when using loops to access columns or rows in sequence. If your counter drops to zero (or some

unspeciÖ ed values) then you will Ö nd the program operating on all rows or columns instead of just

one.

For vectors only one co-ordinate is needed. For example to refer to rows r1-r2 of a column vector

vec we would type

vec[r1:r2]

A last way to identify a set of row