HP 15C Uživatelský manuál stáhnout pdf (Strana 139)

Section 12: Calculating with Matrices 139

Keystrokes

Display

| " 8

Deactivates Complex

mode.

2 v ´ m A

2.0000

Dimensions matrix A

to be 2×2.

´ > 1

2.0000

Prepares for automatic

entry of matrix

elements in User mode.

´ U

2.0000

(Turns on the USER

annunciator.)

3.8 O A

A 1,1

Denotes matrix A, row

1, column 1. (A display

like this appears

momentarily as you

enter each element and

remains as long as you

hold the letter key.)

3.8000

Stores a

7.2 O A

7.2000

Stores a

1.3 O A

1.3000

Stores a

.9 “ O A

-0.9000

Stores a

2 v 1 ´ m

1.0000

Dimensions matrix B to

be 2×l.

16.5 O B

16.5000

Stores b

22.1 “ O B

-22.1000

Stores b

´ < C

-22.1000

Designates matrix C

for storing the result.

Using matrix notation, the solution of the matrix equation AX = B is

X = A

-1

where A

1

is the inverse of matrix A. You can perform this operation by

B and A into the Y- and X-registers

and then pressing ÷. (A descriptor shows the name and dimensions of a

matrix.) Note that if A and B were numbers, you could calculate the answer

in a similar manner.

1 2 ... 134 135 136 137 138 139 140 141 142 143 144 ... 287 288

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