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Section 12
Calculating With Matrices
The HP-15C enables you to perform matrix calculations, giving you the
capability to handle advanced problems with ease. The calculator can work
with up to five matrices, which are named
A
through
E
since they are
accessed using the corresponding
A
through
E
keys. The HP-15C lets
you specify the size of each matrix, store and recall the values of matrix
elements, and perform matrix operations – for matrices with real or
complex elements. (A summary of matrix functions is listed at the end of
this section.)
A common application of matrix calculations is solving a system of linear
equations. For example, consider the equations
3.8
x
1
+ 7.2
x
2
= 16.5
1.3
x
1
- 0.9
x
2
= -22.1
for which you must determine the values of
x
1
and
x
2
.
These equations can be expressed in matrix form as
AX = B
, where
2
1
,
0.9
1.3
7.2
3.8
x
x
X
A
, and
22.1
16.5
B
.
The following keystrokes show how easily you can solve this matrix
problem using your HP-15C. (The matrix operations used in this example
are explained in detail later in this section.)
First, dimension the two known matrices,
A
and
B
, and enter the values of
their elements, from left to right along each row from the first row to the
last. Also, designate matrix
C
as the matrix that you will use to store the
result of your matrix calculation (
C = X
).
Summary of Contents for HP-15C
Page 1: ...HP 15C Owner s Handbook HP Part Number 00015 90001 Edition 2 4 Sep 2011 ...
Page 17: ...Part l HP 15C Fundamentals ...
Page 64: ......
Page 65: ...Part ll HP 15C Programming ...
Page 118: ...118 ...