"With" Key; Store Key; (Comment) Program Editor/Control Menu Key - Texas Instruments TITANIUM TI-89 User Manual

|
("with") Í
key
expression Boolean expression1
|
expression2
The "with" (|) symbol serves as a binary operator.
The operand to the left of | is an expression. The
operand to the right of | specifies one or more
relations that are intended to affect the
simplification of the expression. Multiple relations
after | must be joined by a logical "and".
The "with" operator provides three basic types of
functionality: substitutions, interval constraints,
and exclusions.
Substitutions are in the form of an equality, such
as or
x=3
side should be a simple variable.
variable
occurrence of
Interval constraints take the form of one or more
inequalities joined by logical "and" operators.
Interval constraints also permit simplification that
otherwise might be invalid or not computable.
Exclusions use the "not equals" (/= or ƒ)
relational operator to exclude a specific value
from consideration. They are used primarily to
exclude an exact solution when using
cZeros()
!
(store) §
key
expression var
!
list var
!
matrix var
!
expression fun_name(parameter1,...)
!
list fun_name(parameter1,...)
!
matrix ! fun_name(parameter1,...)
If variable
initializes it to
If already exists and if it is not locked or
var
protected, replaces its contents with
list , or matrix
Hint: If you plan to do symbolic computations
using undefined variables, avoid storing anything
into commonly used, one-letter variables such as
a, b, c, x, y, z, etc.
¦
(comment)
Program Editor/Control menu or
text
¦ [ ]
¦ processes
used to annotate program instructions.
¦ can be at the beginning or anywhere in the
line. Everything to the right of ¦, to the end of
the line, is the comment.
912
and Boolean
[
... and Boolean expressionN
] [
. To be most effective, the left
y=sin(x)
= will substitute
value value
in
variable expression
, , ,
fMax() fMin() solve()
does not exist, creates
var
, , or
expression list matrix
.
as a comment line, which can be
text
x+1| x=3 ¸
]
x+y| x=sin(y) ¸
x+y| sin(y)=x ¸
x^3 ì 2x+7 ! f(x) ¸
f(x)| x= ‡ (3) ¸
|
expression
for every
(sin(x))^2+2sin(x) ì 6| sin(x)=d ¸
.
solve(x^2 ì 1=0,x)|x>0 and x<2 ¸
‡ (x) ù ‡ (1/x)|x>0 ¸
‡ (x) ù ‡ (1/x) ¸
solve(x^2 ì 1=0,x)| x ƒ 1 ¸
,
cSolve()
, , etc.
zeros()
p /4 ! myvar ¸
2cos(x) ! Y1(x) ¸
{1,2,3,4} ! Lst5 ¸
and
var
[1,2,3;4,5,6] ! MatG ¸
.
"Hello" ! str1 ¸
expression ,
¥ d
key
Program segment:
©
: ¦ Get 10 points from the Graph
screen
:For i,1,10 ¦ This loops 10 times
©
Appendix A: Functions and Instructions
4
sin(y) + y
x + y
Done
‡ 3 + 7
d ñ +2d ì 6
x = 1
1
1
x ø x
x = ë 1
p
4
Done
{1 2 3 4}
1 2 3
[ ]
4 5 6
"Hello"