Function: _[_.._]
Section: symbolic_operators
C-Name: vecslice0
Prototype: GD0,L,L
Help: x[a..b] = [x[a], x[a+1], ..., x[b]]

Function: _[_.._,_.._]
Section: symbolic_operators
C-Name: matslice0
Prototype: GD0,L,D0,L,D0,L,D0,L,
Help: x[a..b,c..d] = [x[a,  c], x[a,  c+1], ..., x[a,  d];
                      x[a+1,c], x[a+1,c+1], ..., x[a+1,d];
                        ...      ...              ...
                      x[b,  c], x[b,  c+1], ..., x[b,  d]]
