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Section 12: Calculating with Matrices 175

6.0000

5.0000

4.0000

matrix A

result mat.

Keys:

⁄

LAST X:

matrix A

5.0000

4.0000

5.0000

matrix B

4.0000

matrix A

result mat.

Keys:

LAST X:

matrix A

Several matrix functions operate on the matrix specified in the X-register

only and store the result in the same matrix. For these operations the

contents of the stack (including the LAST X register) are not moved—

although the display changes to show the new dimensions if necessary.

For the > 7, > 8, and > 9 functions, the matrix

descriptor specified in the X-register is placed in the LAST X register and

the norm or (for > 9) the determinant is placed in the X-register.

The Y-, Z-, and T-registers aren’t changed.

When you recall descriptors or matrix elements into the X-register (with

the stack enabled), other descriptors and numbers already in the stack

move up in the stack—and the contents of the T-register are lost. (The

LAST X register is not changed.) When you store descriptors or matrix

elements, the stack (and the LAST X register) isn’t changed.

In contrast to the operation described above, the O | and l |

functions do not affect the LAST X register and operate as shown on the

next page.

Brand

Model

15c Collector's Edition

HP 15c Collector's Edition User Manual

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