Help System (web edition)

The submatrix of matrix A consisting of rows a1-a2 and columns b1-b2
is denoted by A(a1:a2,b1:b2). The parameters a1,a2,b1,b2 may be
either numeric or symbolic (or literal row and column labels).
The following operations are permitted for submatrices:

MAT C=A(a1:a2,b1:b2)   / C will be a submatrix of A
MAT C(a1,b1)=A         / A will be copied partially over C so that
                         C(a1,b1) will be A(1,1).
MAT LOAD A(a1:a2,b1:b2),L  / see MAT LOAD
MAT LOAD A(*,b1:b2),L  / * indicates the whole range (all rows)

Special cases:
MAT C(3,5)=3.2345      / entering a single element
MAT C(1,2)=k
MAT C(0,2)="sum"       / label of column 2 will be "sum"
MAT C(5,0)="row5"

  S = Submatrices by MAT C=SUB(A,Srow,Scol) 
  L = Literal row and column labels 
  M = More information on MAT operations