HP 39gs Master Manual page 198

LSQ(<matrix1>,<matrix2>)
The least squares function displays the minimum norm least squares matrix (or vector).
LU(<matrix>)
This Decomposition function is similar to the
LU
into three matrices, returning them in the form of a list variable.
{[[lower triangular]],[[upper triangular]],[[permutation]]}
The upper triangular has ones on its diagonal. The matrices can be separated in the same method outlined
for the function.
LQ
MAKEMAT(<expression>,<rows>,<columns>)
The MAKEMAT function is used, mainly by programmers to manufacture a matrix with dimensions rows ×
columns, using the supplied expression to calculate each element.
Eg.
MAKEMAT(0,3,3)
Note: If the expression contains the variables
current row number for
Eg.
MAKEMAT(I+J,3,3)
QR(<matrix>)
The function is similar to the
QR
matrices, returning them in the form of a list variable.
{[[m×m orthogonal]],[[m×n uppertrapezoidal]],[[n×n permutation]]}
RANK(<matrix>)
This function returns the rank of a rectangular matrix.
returns a 3×3 zero matrix,
and the current column number for
I
returns the matrix
function on the previous page. It factors an m x n matrix into three
LQ
function on the previous page. It factors a square matrix
LQ
and , then the calculation for each element substitutes the
I J
during the calculation.
J
⎡ ⎤
2 3 4
⎢ ⎥
3 4 5
⎢ ⎥
⎢ ⎥ ⎦
⎣
4 5 6
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