Texas Instruments TI-89 Titanium Short User Manual page 192

ExpReg
MATH/Statistics/Regressions menu
list1, list2
ExpReg
Calculates the exponential regression and
updates all the system statistics variables.
All the lists must have equal dimensions except
for
list5
represents xlist.
list1
list2 represents ylist.
represents frequency.
list3
represents category codes.
list4
represents category include list.
list5
Note:
or c1–c99 (columns in the last data variable
shown in the Data/Matrix Editor).
have to be a variable name and cannot be c1–c99
.
factor()
MATH/Algebra menu
expression1
factor(
list1 ,var
factor( [
matrix1
factor(
factor(
with respect to all of its variables over a common
denominator.
expression1
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(
factored with respect to variable
expression1
real factors that are linear in
introduces irrational constants or subexpressions
that are irrational in other variables.
The factors and their terms are sorted with
the main variable. Similar powers of
collected in each factor. Include
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
some incidental factoring with respect to other
variables.
186
[ ]
, [ list3 ] [, list4, list5 ]
.
through must be a variable name
list1 list4
]) ⇒
var expression
[,
]) ⇒
list
]) ⇒
,var matrix
[
) returns
expression1 expression1
is factored as much as possible toward
returns
expression1,var
)
is factored as much as possible toward
var
var
In function graphing mode:
{1,2,3,4,5,6,7,8}! L1 ¸
{1,2,2,2,3,4,5,7}! L2 ¸
ExpReg L1,L2 ¸
ShowStat ¸
does not
list5
¸
Regeq(x)"y1(x) ¸
NewPlot 1,1,L1,L2 ¸
¥ %
factor(a^3ù x^2ì aù x^2ì a^3+a)
¸
factored
factor(x^2+1) ¸
factor(x^2ì 4) ¸(x ì 2)ø (x + 2)
factor(x^2ì 3) ¸
factor(x^2ì a) ¸
expression1
factor(a^3ù x^2ì aù x^2ì a^3+a,x)
.
var
¸
, even if it
factor(x^2ì 3,x) ¸
as
var
factor(x^2ì a,x) ¸
are
var
if
var
. There might be
Appendix A: Functions and Instructions
aø(a ì1)ø(a + 1)ø(x ì1)ø(x + 1)
aø (añ ì 1)ø (x ì 1)ø (x + 1)
(x + ‡3)ø (x ì ‡3)
(x + ‡a)ø (x ì ‡a)
...
{1 2 }
...
{1 2 }
Done
Done
Done
xñ + 1
xñ ì 3
xñ ì a