# Simple Operations With Vectors; Changing Sign; Addition, Subtraction - HP 48gII User Manual

Graphing calculator.

(3) Move the cursor up two positions by using ——. Then press @ ROW.
The second row will disappear.
(4) Press @ ROW@. A row of three zeroes appears in the second row.
(5) Press @ COL@. The first column will disappear.
(6) Press @ COL@. A column of two zeroes appears in the first column.
(7) Press @GOTO@ 3@@OK@@ 3@@OK@@ @@OK@@ to move to position (3,3).
STK@@.
(8) Press
This will place the contents of cell (3,3) on the stack,
@→
although you will not be able to see it yet. Press ` to return to normal
display. The number 9, element (3,3), and the full matrix entered will be
available in the stack.

## Simple operations with vectors

To illustrate operations with vectors we will use the vectors u2, u3, v2, and v3,
stored in an earlier exercise. Also, store vector A=[-1,-2,-3,-4,-5] to be used in
the following exercises. [Note: not all lines will be visible when done with the
exercises in the following figures.]

### Changing sign

To change the sign of a vector use the key \, e.g.,

Addition and subtraction of vectors require that the two vector operands have
the same length:
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