HP 15c - Manual (Page 177)

Section 12: Calculating with Matrices 177
The > 7 (row norm) and > 8 (Frobenius norm) functions also
operate as conditional branching instructions in a program. If the X-register
contains a matrix descriptor, these functions calculate the norm in the usual
manner, and program execution continues with the next program line. If the
X-register contains a number, program execution skips the next line. In both
cases, the original contents of the X-register are stored in the LAST X
register. This is useful for testing whether a matrix descriptor is in the X-
register during a program.
Summary of Matrix Functions
Keystroke(s) Results
|c
Transforms Z
P
into Z
C
.
“
Changes sign of all elements in matrix specified in
X-register.
´m {A
through E, V}
Dimensions specified matrix.
´> 0
Dimensions all matrices to 0×0.
´> 1
Sets row and column numbers in R
0
and R
1
to 1.
´> 2
Transform Z
P
into .
´> 3
Transforms into Z
P
.
´> 4
Calculate transpose of matrix specified in X-register.
´> 5
Multiplies transpose of matrix specified in Y-
register with matrix specified in X-register. Stores in