HP HP-67 - Page 103

Function Keys 99
In the HP-67, angle 6 is represented in the following manner:
To convert from rectangular x, y coordinates to polar r, 6 coordinates
(magnitude and angle, respectively):
—
Key in the y-coordinate.
2. Press to raise the y-coordinate value to the Y-register of
the stack.
3. Key in the x-coordinate.
4. Press B} (to polar). Magnitude r then appears in the
X-register and angle 6 is placed in the Y-register. (To display
the value for 6, you can press [§ (%%3).)
The following diagram shows how the stack contents change when
you press 3
T t t T
Z z z z
Y |y-coordinate —» —» angle ¢ Y
X [ooorehe® gy ;
x-coordinate —» — magnituder| X