Miscellaneous operations involving matrices, Using a matrix element with register operations, Using matrix descriptors in the index register – HP 15c User Manual

Page 173

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Section 12: Calculating with Matrices 173

A problem using this procedure is given in the HP-15C Advanced Functions
Handbook
under Solving a Large System of Complex Equations.

Miscellaneous Operations Involving Matrices

Using a Matrix Element With Register Operations

If a letter key specifying a matrix is pressed after any of the following
function keys, the operation is performed using the matrix element specified
by the row and column numbers in R

0

and R

1

, just as though it were a data

storage register.

O

*

l

*

O{+, -, *, ÷} l{+

,

-

,

*

,

÷}

e

I

X

Using Matrix Descriptors in the Index Register

In certain applications, you may want to perform a programmed sequence
of matrix operations using any of the matrices A through E. In this
situation, the matrix operations can refer to whatever matrix descriptor is
stored in the index register (R

I

).

If the Index register contains a matrix descriptor:

Pressing % after any of the functions listed above performs the
operations using the element specified by R

0

and R

1

and the matrix

specified in R

I

.

Pressing % after O| or l| performs the operation
using the element specified by the row and column numbers in the
Y- and X-registers and the matrix specified in R

I.

*

Also, in User mode the row and column numbers in R

0

and R

1

are incremented according to the

dimensions of the specified matrix.

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