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=(@1øx+@2)ø
e
ë x
+xñì4øx+6
right(ans(1))! temp ¸
(@1øx+@2)ø
e
ë x
+xñì4øx+6
d
(temp,x,2)+2ù
d
(temp,x)+tempìx^2
¸ 0
DelVar temp ¸ Done
To Next Page
Loading...
Need help?
General
