HP 33s hp 33s_user's manual_English_E_HDPM20PIE56.pdf - Page 74

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 -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. y, x θ, r Yy θ Xx r θ,r y, x 4-10 Real-Number Functions