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Values stored in the coordinate conversion registers remain there until
the numbers are overwritten by another coordinate conversion cal-
culation.
Using
and
With the Coordinate Conversion
Registers. You can perform the same store/recall operations on the
x, ¥, 1, and 0 registers as you can with variables. For example,
B(RADIUS] recalls the contents of 7, and 5
B(xCooRD adds 5
to the contents of x.
You can use
to "force" a store operation. For example, you can
store 3 into both x and y by pressing 3 [l xCOORD ] (STO] [¥COORD].
(If you omitted (STO], pressing @[yCOORD would do a calculation.)
Probability Functions
The PROB menu is used to calculate combinations, permutations and
factorials.
Combinations and Permutations. The keystrokes for calculating
combinations and permutations are:
n-value [INPUT] r-value [§(PROB] {Cn,r }
and
n-value [INPUT] r-value §(PROB]
{Pn.r }
The number of combinations of n objects taken r at a time is the num-
ber of different sets containing r items that can be taken from a larger
group of n items. No item occurs more than once in the set of r items,
and different orders of the same r items are not counted separately.
The number of permutations of n objects taken r at a time is the num-
ber of different arrangements of r items that can be taken from a
larger group of n items. No item can occur more than once in an ar-
rangement, and different orders of the same r items are counted
separately.
50
3: Numeric Functions
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