Texas Instruments TI-89 Titanium User Manual page 798

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
represents ylist.
list2
represents frequency.
list3
represents category codes.
list4
represents category include list.
list5
Note:
list1
c1–c99 (columns in the last data variable shown in
the Data/Matrix Editor).
variable name and cannot be c1–c99.
factor()
MATH/Algebra menu
expression1
factor(
]) ⇒
list1 ,var
factor( [
matrix1 ,var
factor( [
expression1
factor(
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.
expression1,var
factor(
with respect to variable
expression1
real factors that are linear in
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
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 . There might be some incidental factoring with
var
respect to other variables.
Appendix A: Functions and Instructions
[ ]
, [ list3 ] [, list4, list5 ]
through must be a variable name or
list4
does not have to be a
list5
]) ⇒
var expression
[,
list
]) ⇒
matrix
) returns
expression1
is factored as much as possible toward
returns
expression1
)
.
var
is factored as much as possible toward
, even if it introduces
var
var
if factorization is
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 ¸
¸
Regeq(x)"y1(x) ¸
NewPlot 1,1,L1,L2 ¸
¥ %
factor(a^3ù x^2ì aù x^2ì a^3+a)
¸
aø(a ì1)ø(a + 1)ø(x ì1)ø(x + 1)
factored with
factor(x^2+1) ¸
factor(x^2ì 4) ¸ (x ì 2)ø (x + 2)
factor(x^2ì 3) ¸
factor(x^2ì a) ¸
factored
factor(a^3ù x^2ì aù x^2ì a^3+a,x)
¸
factor(x^2ì 3,x) ¸
as
var
factor(x^2ì a,x) ¸
are
{1 2
{1 2
aø (añ ì 1)ø (x ì 1)ø (x + 1)
(x + ‡3)ø (x ì ‡3)
(x + ‡a)ø (x ì ‡a)
... }
... }
Done
Done
Done
xñ + 1
xñ ì 3
xñ ì a
795