Texas Instruments TI-89 Voyage 200, User Manual

Page: 831 / 1008

Appendix A: Functions and Instructions 831
imag(
matrix1
)
⇒ ⇒ ⇒ ⇒
matrix
Returns a matrix of the imaginary parts of the
elements.
imag([a,b;ic,id])
¸
[
0 0
c d]
ImpDif()
MATH/Calculus Menu, CATALOG
ImpDif( equation, independentVar, dependent-
Var[,order ] )
⇒
⇒ ⇒
⇒
expression
where the order defaults to 1.
Computes the implicit derivative for equations in
which one variable is defined implicitly in terms
of another.
impDif(x^2+y^2=100,x,y)
¸
-x/y
Indirection
See
#()
, page 908.
Input
CATALOG
Input
Pauses the program, displays the current Graph
screen, and lets you update variables
xc
and
yc
(also
rc
and
q c
for polar coordinate mode) by
positioning the graph cursor.
When you press
¸
, the program resumes.
Program segment:
©
:
¦
Get 10 points from the Graph
Screen
:For i,1,10
: Input
: xc
!
XLIST[i]
: yc
!
YLIST[i]
:EndFor
©
Input [
promptString
, ]
var
Input
[ promptString ], var pauses the program,
displays promptString on the Program I/O screen,
waits for you to enter an expression, and stores
the expression in variable
var
.
If you omit
promptString
, “?” is displayed as a
prompt.
Program segment:
©
:For i,1,9,1
: "Enter x" & string(i)
!
str1
: Input str1,#(right(str1,2))
:EndFor
©
InputStr
CATALOG
InputStr [
promptString
, ]
var
Pauses the program, displays promptString on the
Program I/O screen, waits for you to enter a
response, and stores your response as a string in
variable
var .
If you omit promptString , “?” is displayed as a
prompt.
Note: The difference between
Input
and
InputStr
is that
InputStr
always stores the
result as a string so that “ ” are not required.
Program segment:
©
:InputStr "Enter Your Name",str1
©