HP 38g Graphing Calculator - Manual (Page 141)

Matrix Functions, continued
LQ LQ Factorization. Factors mxn matrix into three matrices:
{ [ [ mXn lowertrapezoidal] ] , [ [ nxn orthogonal] ] ,
[ [ mxm permutation ] ]} .
hQ [matrix)
LSQ Least Squares. Displays the minimum norm least squares matrix
(or vector).
hSQ [matrix!, matrix2)
LU LU Decomposition. Factors a square matrix into three matrices:
{[ [lowertriangular] ] , [ [uppertriangular] ] , [ [permutation] ]}
The uppertriangular has ones on its diagonal.
LU [matrix]
MAKEMAT Make Matrix. Creates a matrix of dimension rows x columns,
using expression to calculate each element. If expression
contains the variables I and J, then the calculation for each
element substitutes the current row number for I and the current
column number for J.
y¡AKEMAT(expression, rows, columns')
Example: MAKEMAT ( 0 , 3 , 3 ) returns a 3x3 zero matrix,
[[0,0,0], [0,0,0], [0,0,0]].
QR
QR Factorization. Factors an mXn matrix into three matrices:
{ [ [ m X m orthogonal] ] , [ { m X n uppertrapezoidal] ] , [ [ n x n
permutation] ] ).
QR [matrix)
RANK Rank (an integer) of a rectangular matrix.
RANK (mate)
ROWNORM Row Norm. Finds the maximum value (over all rows) of the sums
of the absolute values of all elements in a row.
ROWNORM (mate)
RREF Reduced Row-Echelon. Changes a rectangular matrix to its
reduced row-echelon form.
RREF [matrix)
Using Matrices 6-11