Texas Instruments TITANIUM TI-89 - Manual (Page 819)

Appendix A: Functions and Instructions 819
ExpReg MATH/Statistics/Regressions menu
ExpReg list1, list2 [ , [ list3 ] [, list4, list5 ] ]
Calculates the exponential regression and
updates all the system statistics variables.
All the lists must have equal dimensions except
for
list5 .
list1 represents xlist.
list2 represents ylist.
list3 represents frequency.
list4 represents category codes.
list5 represents category include list.
Note: list1 through list4 must be a variable name
or c1–c99 (columns in the last data variable
shown in the Data/Matrix Editor).
list5 does not
have to be a variable name and cannot be c1–c99
.
In function graphing mode:
{1,2,3,4,5,6,7,8}! L1 ¸
{1 2 ... }
{1,2,2,2,3,4,5,7}! L2 ¸
{1 2 ... }
ExpReg L1,L2 ¸ Done
ShowStat ¸
¸
Regeq(x)"y1(x) ¸ Done
NewPlot 1,1,L1,L2 ¸ Done
¥%
factor() MATH/Algebra menu
factor( expression1 [, var ])
⇒ ⇒ ⇒ ⇒ expression
factor( list1 [ ,var ]) ⇒ ⇒ ⇒ ⇒ list
factor( matrix1 [ ,var ])
⇒ ⇒ ⇒ ⇒ matrix
factor( expression1 ) returns expression1 factored
with respect to all of its variables over a common
denominator.
expression1 is factored as much as possible toward
linear rational factors without introducing new
non-real subexpressions. This alternative is
appropriate if you want factorization with respect
to more than one variable.
factor(a^3ù x^2ì aù x^2ì a^3+a) ¸
aø(a м 1)ш(a + 1)ø(x м 1)ш(x + 1)
factor(x^2+1) ¸ xñ + 1
factor(x^2ì 4) ¸ (x м 2)ш (x + 2)
factor(x^2ì 3) ¸ xс м 3
factor(x^2ì a) ¸ xс м a
factor( expression1,var ) returns expression1
factored with respect to variable var .
expression1 is factored as much as possible toward
real factors that are linear in var , even if it
introduces irrational constants or subexpressions
that are irrational in other variables.
The factors and their terms are sorted with var as
the main variable. Similar powers of var are
collected in each factor. Include var if
factorization is needed with respect to only that
variable and you are willing to accept irrational
expressions in any other variables to increase
factorization with respect to
var . There might be
some incidental factoring with respect to other
variables.
factor(a^3ù x^2ì aù x^2ì a^3+a,x) ¸
aø (aс м 1)ш (x м 1)ш (x + 1)
factor(x^2ì 3,x)
¸
(x + ‡ 3)ø (x ì ‡ 3)
factor(x^2ì a,x) ¸
(x + ‡ a)ø (x ì ‡ a)