Exec, Exit, Exp 4444 list() – Texas Instruments TITANIUM TI-89 User Manual

Page 817: Expand(), Appendix a: functions and instructions 817

Appendix A: Functions and Instructions

817

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

Loop

block.

Exit

is not allowed outside the three looping

structures (

For

While

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

4444list()

CATALOG

exp

4444list(

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

4444list()

is not necessary with the

zeros

and

cZeros()

functions because they return a list

of solution values directly.

solve(x^2ì xì 2=0,x)

x=2

x=ë 1

exp4list(solve(x^2ì xì 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)

xс +

2ш xш y

2ø x

yс +

2ш y

expand((x^2ì x+y^2ì y)/(x^2ù y^2ì x^2ù

yì xù y^2+xù y))