Section 12: Calculating with Matrices 141
Matrix inversion, for example, can be performed on an 8×8 matrix 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:
Key the number of rows (y) into
the display, then press v
to lift it into the Y-register.
*
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.
îš‚
You don't need to press ´ before the letter key. (Refer to Abbreviated Key Sequences on page 78.)
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