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The example Program Editor function to the right
uses
getType()
implement symbolic differentiation. Studying and
completing this function can help teach you how
to differentiate manually. You could even include
functions that the cannot differentiate, such as
Bessel functions.
PassErr
CATALOG
PassErr
Passes an error to the next level.
If "errornum" is zero,
anything.
The
Else
or
PassErr
ignored, use
is not known, use
error handler. (See also
Pause
CATALOG
expression
Pause [
Suspends program execution. If you include
expression
screen.
expression
as
4 4 4 4 DD
operator to perform unit and number base
conversions.
If the result of
single screen, you can use the cursor pad to scroll
the display.
Program execution resumes when you
press ¸.
852
and
to partially
part()
PassErr
clause in the program should use
. If the error is to be processed or
. If what to do with the error
ClrErr
to send it to the next
PassErr
.)
ClrErr
]
, displays
on the Program I/O
expression
can include conversion operations such
. You can also use the 4
and
4 4 4 4 Rect
is too big to fit on a
expression
:d(y,x)
:Func
:Local f
:If getType(y)="VAR"
: Return when(y=x,1,0,0)
:If part(y)=0
: Return 0 ¦ y= p , ˆ ,
:part(y,0) ! f
:If f=" L " ¦ if negate
: Return ë d(part(y,1),x)
:If f=" " ¦ if minus
: Return d(part(y,1),x)
:If f="+"
: Return d(part(y,1),x)
:If f=" ù "
: Return part(y,1) ù d(part(y,2),x)
:If f="{"
: Return seq(d(part(y,k),x),
:Return undef
:EndFunc
See
does not do
ClrErr
Program segment:
:ClrIO
:DelVar temp
:1 " temp[1]
:1 " temp[2]
:Disp temp[2]
: ¦ Guess the Pattern
:For i,3,20
: temp[i ì 2]+temp[i ì 1] " temp[i]
: Disp temp[i]
: Disp temp,"Can you guess the
: Pause
:EndFor
Appendix A: Functions and Instructions
,numbers
i
ì d(part(y,2),x)
+d(part(y,2),x)
+part(y,2) ù d(part(y,1),x)
k,1,part(y))
program listing example.
ClrErr
©
next","number?"
©
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