HP 49g Graphing Calculator - Manual (Page 160)

Absolute magnitude
The absolute magnitude of a vector—also known as the scalar
magnitude—is the square root of the sum of the squares of the value of
each element.
To calculate the absolute magnitude of [1 2 4]:
1. Press 0®.
2. Press 00.
3. Enter 1 0O 2 0O 4
4. Press(ENTER).
The result is 01 .
An example where you need to calculate the absolute magnitude is in
finding the imit vector. The unit vector is foimd by dividing the given
vector by its magnitude:
V
|v|
u
Suppose you want to find the imit vector of [3 4]:
1. Press 0 0 3 0 Q 4 ® t o enter the
niunerator.
2. Press 0.
3. Press 0®).
4. Press 00 3 00 4 to complete the
denominator.
5. Press (ENTER) to obtain the imit vector, which in this case is:
RftO HVZ HEK ff!=
iHOHEi
fiLil
. C3 4]
■ ICS 411
ri 11
L5 5J
3 4
5’ 5
Page 8-4 Vectors, lists, arrays, and matrices