Section 12: Calculating with Matrices 177
´ > 1
´ b 4
l Á
| x
“User” O Á
t 4
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 Z.
´ > 3 Transforms Z into Z
P
.
´ > 4 Calculates transpose of matrix specified in X-register.
For last
matrix element
For all
matrix
elements
except last
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