HP 15c Scientific Y, Y +, Display, l>B b 2, l>A A 2, Pressing, Example:, C = B - A, Keystrokes, Calculates, Keystrokes Display, Arithmetic Operations

		Section 12: Calculating with Matrices 153
Keystrokes	Display
1 -	b	2	3 Subtracts 1 from the elements of

matrix B and stores those values in the same elements of B.

The result (which you can view using lBin User mode) is

⎡1	3	5 ⎤
B = ⎢	9	⎥ .
⎣⎢7		17⎦⎥

Arithmetic Operations

With matrix descriptors in both the X- and Y-registers, pressing +or

-calculates the sum or difference of the matrices.

Pressing	Calculates*
+	Y + X
-	Y - X

*Result is stored in result matrix. Result matrix may be X or Y

Example: Calculate C = B - A, where A and B are defined in the previous example.

⎡1	2	3⎤	⎡1	3	5 ⎤
A = ⎢		⎥	and B = ⎢		⎥.
⎣4	5	9⎦	⎣7	9	17⎦

Keystrokes Display

´<C

l>B b 2 3l>A A 2 3

Designates C as result matrix.

Recalls descriptor of matrix B. (This step can be skipped if descriptor is already in X-register.)

Recalls descriptor of matrix A into X-register, moving descriptor of matrix B to Y-register.