HP HP-15C

158 Section 12: Calculating with Matrices
Keystrokes
Display
274 OB
274.0000
Stores b
11
.
*
233 OB
233.0000
Stores b
12
.
331 OB
331.0000
Stores b
13
.
120.32 OB
120.3200
Stores b
21
.
112.96 OB
112.9600
Stores b
22
.
151.36 OB
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.
lÁ
186.0000
Recalls d
11
, the weight of cabbage
for the first week.
lÁ
141.0000
Recalls d
12
the weight of cabbage
for the second week.
lÁ
215.0000
Recalls d
13
.
lÁ
88.0000
Recalls d
21
.
lÁ
92.0000
Recalls d
22
.
lÁ
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.