Texas Instruments TI-86 - Manual (Page 306)

294
Chapter 20: A to Z Function and Instruction Reference
20ATOZ.DOC TI-86, Chap 20, US English Bob Fedorisko Revised: 02/13/01 2:42 PM Printed: 02/13/01 3:05 PM Page 294 of 118
ExpR
Uses xStat , yStat , and fStat , and stores the regression
equation to RegEq only.
Factorial: !
MATH PROB menu
number ! or ( expression ) !
Returns the factorial of a real integer or non-integer,
where 0
 integer  449 and 0  non-integer  449.9. For
a non-integer, the Gamma function is used to find the
factorial. An expression must evaluate to an appropriate
value.
6! b 720
12.5! b 1710542068.32
list !
Returns a list in which each element is the factorial of
the corresponding element in list.
{6,7,8}! b {720 5040 40320}
fcstx
† STAT menu
fcstx yValue
Based on the current regression equation ( ReqEq ),
returns the forecasted x at a real yValue.
fcsty
† STAT menu
fcsty xValue
Based on the current regression equation ( ReqEq ),
returns the forecasted y at a real xValue.