HP 15c Collector's Edition

158 Section 12: Calculating with Matrices
Keystrokes
Display
274 O B
274.0000
Stores b
11
.
*
233 O B
233.0000
Stores b
12
.
331 O B
331.0000
Stores b
13
.
120.32 O B
120.3200
Stores b
21
.
112.96 O B
112.9600
Stores b
22
.
151.36 O B
151.3600
Stores b
23
.
´ < Á
151.3600
Designates matrix D as
result matrix.
l > B
b 2 3
Recalls descriptor of
constant matrix.
l > A
A 2 2
Recalls descriptor of
coefficient matrix A into
X-register, moving
descriptor of constant
matrix B into Y-register.
÷
d 2 3
Calculates A
−1
B and stores
result in matrix D.
l Á
186.0000
Recalls d
11
, the weight of
cabbage for the first week.
l Á
141.0000
Recalls d
12
the weight of
cabbage for the second
week.
l Á
215.0000
Recalls d
13
.
l Á
88.0000
Recalls d
21
.
l Á
92.0000
Recalls d
22
.
l Á
116.0000
Recalls d
23
.
´ U
116.0000
Deactivates User mode.
*
Note that you did not need to press ´ > 1 before beginning to store the
elements of matrix B. This is because after you stored the last element of matrix A, the
row and column numbers in R
0
and R
1
were automatically reset to 1.