Texas Instruments TITANIUM TI-89 - Manual (Page 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 , 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 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 or
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 + 1
expand((x^2ì x+y^2ì y)/(x^2ù y^2ì x^2ù
yì xù y^2+xù y)) ¸