Coordinate Conversions

The function names for these conversions are y,xÆθ,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 –πand 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.

Y

 

y, x

 

 

 

θ, r

 

 

 

 

 

 

 

 

 

 

y

 

 

 

 

 

θ

X

x

 

 

 

 

 

r

 

 

θ,r

 

 

y, x

 

 

 

 

4–10Real–Number Functions