CITIZEN SR-135NPU - Manual (Page 9)

SR135_English_090326.rtf SIZE : 140x75mm SCALE 2:1
2009/3/26
- E8 -
Key input display
[2] [
÷
] [3] [=] 0.666666666
[SHIFT] [ ] SCI
FIX
[5] 0.66667
[ ] SCI
FIX
6.66667-01
[SHIFT] [ ] SCI
FIX
[ • ] 6.6666666-01
(21) [X↔Y] : Exchange key.
Used to exchange the displayed number with the
contents of an internal register.
(22) [a], [b], [R→P], [P→R] : Coordinate conversion.
a. These keys convert the rectangular coordinate into the polar
coordinate and the polar coordinate into the rectangular
coordinate. The range units that have been set by the [DRG]
key follow.
b. Respective defined areas and accuracy are as shown in
behind chart however, the range of θ obtained by R→P in
degree is as follows:
1st Quadrant 0°≤θ≤ 90°
2nd Quadrant 90°≤θ≤ 180°
3rd Quadrant –180°≤θ≤–90°
4th Quadrant –90°≤θ≤ 0°
c. Input of 2 variable is performed by setting x or r pressing [a]
key and y or θ pressing [b] key.
d. The operation result of x or r is obtained in the display register
or by pressing [a] key and y or θ by pressing [b] key.
Input Data Result
a b a b
R→P
(Rectangular→Polar)
x y r θ
P→R
(Polar→Rectangular)
r θ x y
(→ r,θ) r = 2 2 y x + ,θ= tan –1 y/x
(→ x, y) x = r cosθ, y = r sinθ