HP 33S, User Manual

Page: 74 / 388

4–10
Real–Number Functions
File name 33s-English-Manual-040130-Publication(Edition 2).doc Page : 388
Printed Date : 2004/1/30 Size : 13.7 x 21.2 cm
Coordinate Conversions
The function names for these conversions are y , x
θ
, r and
θ
,
r y , x .
Polar coordinates ( r
, θ
) and rectangular coordinates ( x , y ) are measured as shown
in the illustration. The angle
θ
uses units set by the current angular mode. A
calculated result for
θ
will be between –180° and 180°, between –
π
and
π
radians,
or between –200 and 200 grads.
To convert between rectangular and polar coordinates:
1. Enter the coordinates (in rectangular or polar form) that you want to convert. In
RPN mode, the order is
y
Ï
x or
θ
Ï
r .
2. Execute the conversion you want: press
¹ °
(rectangular–to–polar) or
º ±
(polar–to–rectangular). The converted coordinates occupy the X–
and Y–registers.
3. The resulting display (the X–register) shows either r (polar result) or x
(rectangular result). Press
w
to see
θ
or y .
x
y
r
X
Y
r y, x
y, x , r
θ
θ
θ
,