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Checking and changing matrix elements individually – HP 15c User Manual

Page 145

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Section 12: Calculating with Matrices 145

Keystrokes

Display

´ > 1

Sets beginning row and column
numbers in R

0

and R

1

to 1.

(Display shows the previous
result.)

´ U

Activates User mode.

1

O A

A 1,1

Row 1, column 1 of A.
(Displayed momentarily while
A key held down.)

1.0000

Value of a

11

.

2

O A

2.0000

Value of a

12

.

3

O A

3.0000

Value of a

13

.

4

O A

4.0000

Value of a

21

.

5

O A

5.0000

Value of a

22

.

6

O A

6.0000

Value of a

23

.

lA

A 1,1

Recalls element in row 1,
column l. (R

0

and R

1

were reset

in preceding step.)

1.0000

Value of a

11

.

l A

2.0000

Value of a

12

.

l A

3.0000

Value of a

13

.

l A

4.0000

Value of a

21

.

l A

5.0000

Value of a

22

.

l A

6.0000

Value of a

23

.

´ U

6.0000

Deactivates User mode.

Checking and Changing Matrix Elements Individually

The calculator provides two ways to check (recall) and change (store) the
value of a particular matrix element. The first method uses storage registers
R

0

and R

1

in the same way as described above – except that the row and

column numbers aren't automatically changed when User mode is
deactivated. The second method uses the stack to define the row and
column numbers.