Texas Instruments TI-89 Manual Book page 463

expand(expression1,[var])
logarithms and fractional powers regardless
of . For increased distribution of
var
logarithms and fractional powers, inequality
constraints might be necessary to guarantee
that some factors are nonnegative.
expand(expression1, [var])
absolute values,
regardless of
Note: See also
angle-sum and multiple-angle expansion.
expr()
MATH/String menu
expr(string)
Returns the character string contained in
as an expression and immediately
string
executes it.
ExpReg
MATH/Statistics/Regressions menu
ExpReg list1, list2
Calculates the exponential regression and
updates all the system statistics variables.
All the lists must have equal dimensions
except for
represents xlist.
list1
represents ylist.
list2
represents frequency.
list3
represents category codes.
list4
represents category include list.
list5
Note:
list1
name or c1–c99 (columns in the last data
variable shown in the Data/Matrix Editor).
does not have to be a variable name and
list5
cannot be c1–c99.
446 Appendix A: Functions and Instructions
also distributes
also distributes
, and exponentials,
sign()
.
var
tExpand() for trigonometric
expression
[ ]
, [list3] [, list4, list5]
.
list5
through must be a variable
list4
ln(2xù y)+‡(2xù y) ¸
ln(2ø xø y) + ‡(2ø xø y)
expand(ans(1)) ¸
ln(xø y) + ‡2ø ‡(xø y) + ln(2)
expand(ans(1))|y>=0 ¸
ln(x) + ‡2ø ‡xø ‡y + ln(y) + ln(2)
sign(xù y)+abs(xù y)+ e^(2x+y)
¸
2ø x+y
+ sign(xø y) + |xø y|
e
expand(ans(1)) ¸
sign(x)øsign(y) + |x|ø|y|+ (e
expr("1+2+x^2+x") ¸
expr("expand((1+x)^2)") ¸
"Define cube(x)=x^3"! funcstr
¸
"Define cube(x)=x^3"
expr(funcstr) ¸
cube(2) ¸
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 ¸
¥ %
x y
2 øe
)
xñ + x + 3
xñ + 2ø x + 1
Done
8
{1 2 ...}
{1 2 ...}
Done
Done
Done