HP 48gII - Manual (Page 324)

Page 10-24
Function ROW+
Function ROW+ takes as argument a matrix, a vector with the same length as
the number of rows in the matrix, and an integer number n representing the
location of a row. Function ROW+ inserts the vector in row n of the matrix.
For example, in ALG mode, we’ll insert the second row in matrix A with the
vector [-1,-2,-3], i.e.,
In RPN mode, enter the matrix first, then the vector, and the row number,
before applying function ROW+. The figure below shows the RPN stack
before and after applying function ROW+.
Function ROW-
Function ROW- takes as argument a matrix and an integer number
representing the position of a row in the matrix. The function returns the
original matrix, minus a row, as well as the extracted row shown as a vector.
Here is an example in the ALG mode using the matrix stored in A:
In RPN mode, place the matrix in the stack first, then enter the number
representing a row location before applying function ROW-. The following
figure shows the RPN stack before and after applying function ROW-.