HP HP-67 - Page 104

100 Function Keys
To convert from polar r, 6 coordinates to rectangular x, y
coordinates:
1. Key in the value for the angle 6.
2. Press to raise the value for 6 to the Y-register of the
stack.
3. Key in the value for magnitude r.
4. Press [0 (to rectangular). The x-coordinate then appears
in the displayed X-register and the y-coordinate is placed in the
Y-register. (To display the value for the y-coordinate, you can
press @3 )
The following diagram shows how the stack contents change when
you press [
T t t T
Z z z Zz
Y angle 0 —> —» y-coordinate Y
X magnitude r| —» i —» x-coordinate, X
After you have pressed [ or 3 7, you can use the key
to bring the calculated angle € or the calculated y-coordinate into the
X-register for viewing or further calculation.
Example
1:
Convert
rectangular
coordinates
(4,
3)
to
polar
form
with
the
angle
expressed
in
radians.