HP HP-11C

52 Section 3: Numeric Functions
Rectangular Conversion. Press-
ing [f] (rectangular) converts T
values in the X- and Y-registers Z
representing polar coordinates (mag-
nitude r, angle ), to rectangular Y=
.—»
—_—
z
0
coordinates (x, y). X=> , _—J_[:
Keys ¥
Example .
To Convert Keys t:)okes Display
Rectangular coordinates
to polar:
y 5 5.0000
X 10 10
r 11.1803
0 26.5651
Polar coordinates to
rectangular:
0 30 30.0000
r 12 12
X 10.3923
y 6.0000
Probability
Permutation. Pressing calculates the number of possible
arrangements of y different items taken in quantities of x items at
a time, where different orders of the same x items are counted
separately. (No item occurs more than once in an arrangement.)
calculates permutations by the following formula:
y!
PE (y—x)