HP 15c Collector's Edition User Manual

Section 12: Calculating with Matrices 141
Matrix inversion and determinants can be performed on a matrix up to
8 × 8 with real elements (or on a 4 × 4 matrix with complex elements, as
described later
*
).
To conserve memory, all matrices are initially dimensioned as 0 × 0. When
a matrix is dimensioned or redimensioned, the proper number of registers
is automatically allocated in memory. You may have to increase the
number of registers allocated to matrix memory before dimensioning a
matrix or before performing certain matrix operations. Appendix C
describes how memory is organized, how to determine the number of
registers currently available for storing matrix elements, and how to
increase or decrease that number.
Dimensioning a Matrix
To dimension a matrix to have y rows and x columns, place those
numbers in the Y- and X-registers, respectively, and then execute ´
m followed by the letter key specifying the matrix:
1.
Key the number of rows (
y
)
into the display, then press
v to lift it into the Y-
register.
Y
number
of rows
2. Key the number of columns
(x) into the X-register.
X
number of
columns
3. Press ´ m followed by
a letter key, A through
E, that specifies the
name of the matrix.
†
*
The matrix functions described in this section operate on real matrices only. (In Complex
mode, the imaginary stack is ignored during matrix operation.) However, the HP 15c has
four matrix functions that enable you to calculate using real representations of complex
matrices, as described on pages 160–173.
†
You don’t need to press ´ before the letter key. (Refer to Abbreviated Key Sequences
on page 78.)

HP 15c Collector's Edition Specifications

General

Brand	HP
Model	15c Collector's Edition
Category	Calculator
Language	English