HP 33s Scientific manual Coordinate Conversions, 10Real-Number Functions

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