Texas Instruments Titanium TI-89, Руководство пользователя

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Appendix A: Functions and Instructions 793
Exec
CATALOG
Exec string [ , expression1 ] [ , expression2 ] ...
Executes a
string
consisting of a series of Motorola
68000 op-codes. These codes act as a form of an
assembly-language program. If needed, the optional
expressions
let you pass one or more arguments to the
program.
For more information, check the TI Web site:
http://www.ti.com/calc
Warning:
Exec
gives you access to the full power
of the microprocessor. Please be aware that you
can easily make a mistake that locks up the
calculator and causes you to lose your data. We
suggest you make a backup of the calculator
contents before attempting to use the
Exec
command.
Exit
CATALOG
Exit
Exits the current
For
,
While
, or
Loop
block.
Exit
is not allowed outside the three looping
structures (
For
,
While
, or
Loop
).
Program listing:
:0
!
temp
:For i,1,100,1
: temp+i
! temp
: If temp>20
: Exit
:EndFor
:Disp temp
Contents of temp after execution: 21
exp
4
list()
CATALOG
exp
4
list(
expression
,
var
)
⇒
list
Examines
expression
for equations that are
separated by the word “or,” and returns a list
containing the right-hand sides of the equations of
the form
var=expression
. This gives you an easy way
to extract some solution values embedded in the
results of the
solve()
,
cSolve()
,
fMin()
, and
fMax()
functions.
Note:
exp
4
list()
is not necessary with the
zeros
and
cZeros()
functions because they return a list of
solution values directly.
solve(x^2
ì
x
ì
2=0,x)
¸
x=2 or
x=
ë
1
exp 4 list(solve(x^2 ì x ì 2=0,x),x)
¸
{ ë 1 2}
expand()
MATH/Algebra menu
expand(
expression1
[ ,
var
] )
⇒
expression
expand(
list1
[
,var
] )
⇒
list
expand(
matrix1
[
,var
] )
⇒
matrix
expand(
expression1
)
returns
expression1
expanded
with respect to all its variables. The expansion is
polynomial expansion for polynomials and partial
fraction expansion for rational expressions.
The goal of
expand()
is to transform
expression1
into
a sum and/or difference of simple terms. In contrast,
the goal of
factor()
is to transform
expression1
into a
product and/or quotient of simple factors.
expand((x+y+1)^2)
¸
x ñ + 2 ø x ø y + 2 ø x + y ñ + 2 ø y + 1
expand((x^2
ì
x+y^2
ì
y)/(x^2
ù
y^2
ì
x^2
ù
y
ì
x
ù
y^2+x
ù
y))
¸