HP 15c User Manual
Page 158
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.