HP 33s - Manual (Page 74)

4–10 Real–Number Functions
Coordinate Conversions
The function names for these conversions are y,xÆ
θ
,r and
θ ,rÆy,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
‘ x or θ ‘ r .
2. Execute the conversion you want: press { r (rectangular–to–polar) or
| s (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
[ to see θ or y.
x
y
r X
Y
r y, x
y, x , r θ
θ
θ ,