784
Appendix A: Functions and Instructions
Define
progName
(
arg1Name, arg2Name, ...
) = Prgm
block
EndPrgm
Creates
progName
as a program or subprogram, but
cannot return a result using
Return
. Can execute a
block of multiple statements.
block
can be either a single statement or a series of
statements separated with the “:” character.
block
also can include expressions and instructions (such
as
If
,
Then
,
Else
, and
For
) without restrictions.
Note:
It is usually easier to author and edit a
program block in the Program Editor rather than on
the entry line.
Define listinpt()=prgm:Local
n,i,str1,num:InputStr "Enter
name of list",str1:Input "No.
of elements",n:For
i,1,n,1:Input "element
"&string(i),num:
num
!
#str1[i]:EndFor:EndPrgm
¸
Done
listinpt()
¸
Enter name of list
DelFold
CATALOG
DelFold
folderName1
[
,
folderName2
] [
,
folderName3
]
...
Deletes user-defined folders with the names
folderName1
,
folderName2,
etc. An error message is
displayed if the folders contain any variables.
Note:
You cannot delete the
main
folder.
NewFold games
¸
Done
(creates the folder
games
)
DelFold games
¸
Done
(deletes the folder
games
)
DelVar
CATALOG
DelVar
var1
[
,
var2
] [
,
var3
]
...
Deletes the specified variables from memory.
2
!
a
¸
2
(a+2)^2
¸
16
DelVar a
¸
Done
(a+2)^2
¸
(a
+
2)
ñ
deSolve()
MATH/Calculus menu
deSolve(
1stOr2ndOrderOde
,
independentVar
,
dependentVar
)
⇒
a general solution
Returns an equation that explicitly or implicitly
specifies a general solution to the 1st- or 2nd-order
ordinary differential equation (ODE). In the ODE:
•
Use a prime symbol ( '
, press
2
È
) to denote
the 1st derivative of the dependent variable with
respect to the independent variable.
•
Use two prime symbols to denote the
corresponding second derivative.
The ' symbol is used for derivatives within
deSolve()
only. In other cases, use
d
( )
.
The general solution of a 1st-order equation
contains an arbitrary constant of the form @
k,
where
k is an integer suffix from 1 through 255. The
suffix resets to 1 when you use
ClrHome
or
ƒ
8:
Clear Home
. The solution of a 2nd-order equation
contains two such constants.
Note:
To type a prime symbol (
'
), press
2
È
.
deSolve(y''+2y'+y=x^2,x,y)
¸
y=(@1
ø
x+@2)
ø
e
ë
x
+x
ñ ì
4
ø
x+6
right(ans(1))
!
temp
¸
(@1
ø
x+@2)
ø
e
ë
x
+x
ñ ì
4
ø
x+6
d
(temp,x,2)+2
ù
d
(temp,x)+temp
ì
x^2
¸
0
DelVar temp
¸
Done
Summary of Contents for Titanium TI-89
Page 9: ...Getting Started 6 TI 89 Titanium keys Ë Ì Í Ê ...
Page 34: ...Getting Started 31 2 or D 2 B u s i n e s s D B D B Press Result ...
Page 43: ...Getting Started 40 3 0 D B D D B D Press Result ...
Page 44: ...Getting Started 41 D 2 0 0 2 D B Scroll down to October and press Press Result ...
Page 58: ...Getting Started 55 Example Set split screen mode to TOP BOTTOM Press Result 3 B D ...
Page 70: ...Getting Started 67 ...
Page 175: ...Operating the Calculator 172 From the Keyboard ...
Page 456: ...Tables 453 ...
Page 527: ...Data Matrix Editor 524 ...
