146 Section 12: Calculating with Matrices
Using R
0
and R
1
.
To access a particular matrix element, store its row
number in R
0
and its column number in R
1
. These numbers won’t change
automatically (unless the calculator is in User mode).
To recall the element value (after storing the row and column
numbers), press l followed by the letter key specifying the
matrix.
To store a value in that element (after storing the row and column
numbers), place the value in the X-register and press O
followed by the letter key specifying the matrix.
Example: Store the value 9 as the element in row 2, column 3 of matrix A
from the previous example.
Keystrokes Display
2 O 0
2.0000
Stores row number in R
0
.
3 O 1
3.0000
Stores column number in R
1
.
9
9
Keys the new element value
into the X-register.
O A
A 2,3
Row 2, column 3 of A.
9.0000
Value of a
23
.
Using the Stack. You can use the stack registers to specify a particular
matrix element. This eliminates the need to change the numbers in R
0
and
R
1
.
To recall an element value, enter the row number and column
number into the stack (in that order). Then press l | followed
by the letter key specifying the matrix. The element value is placed
in the X-register. (The row and column numbers are lost from the
stack.)
To store an element value, first enter the value into the stack
followed by the row number and column number. Then press O
| followed by the letter key specifying the matrix. (The row and
column numbers are lost from the stack; the element value is
returned to the X-register.)
Note that these are the only operations in which the blue | key
precedes a gold letter key.
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