How do you convert a ti 89 program to ti 84 program?
In general, you don't. They speak different dialects of TI-BASIC, and run on different processors (so the assembly language is different).
Here's the code:
Code:
Code:
()
Prgm
©Surface Area v1.0 by
©Dmitriy Myedvyedyev
©(aka Dima Medvedev)
©Copyright 2002
ClrIO
Dialog
Request "EQUATION",fuc
Request "From",im
Request "to",ie
DropDown "around",{"x-axis","y-axis"},axx
EndDlog
If ok=0
Goto ex
getMode("Exact/Approx")→mo
setMode("Exact/Approx","EXACT")
expr(ie)→ie
expr(im)→im
expr(fuc)→fnc
If axx=1 Then
right(solve(fnc,y))→fn(x)
ElseIf axx=2 Then
right(solve(fnc,x))→fn(y)
EndIf
If axx=1 Then
(d(fn(x),x))^2→dd
2*π*∫(fn(x)*√(1+dd),x,im,ie)→ex
Disp approx(ex)
Disp exact(ex)
ElseIf axx=2 Then
(d(fn(y),y))^2→dd
2*π*∫(fn(y)*√(1+dd),y,im,ie)→ex
Disp approx(ex)
Disp exact(ex)
EndIf
string(ie)→ie
string(im)→im
setMode("Exact/Approx",mo)
Pause
Lbl ex
EndPrgm
It appears this program was intended to exploit the 89's CAS capabilities. Since the 83+/84+ don't have CAS, I'm afraid that a simple port won't be possible, unless it's possible to write a numerical (rather than algebraic) algorithm for it.
coursty wrote:
Can you take out the CAS part out?
It would be possible to make it only give the approximate answers; the exact symbolic answer would be impossible.
Does the 84+ have a numeric solver and derivative functions? It may be possible to modify for approximate/numeric math if so (assuming I didn't overlook anything; unfortunately my advanced math is rather rusty).
Travis wrote:
Does the 84+ have a numeric solver and derivative functions? It may be possible to modify for approximate/numeric math if so (assuming I didn't overlook anything; unfortunately my advanced math is rather rusty).
It can indeed do numeric solving of some equations via the Solver / solve(), and it can perform numeric derivatives at a point using nDeriv().
What do you mean by exact is what? I want the answer to be in terms of pi. e.g., 23.4pi . I don't care about all the other function. I think we just have to manipulate the code a little bit but I have no knowledge of programing at the moment. Am going to learn eventually
Oh, what about intergration (I think I mistook the integrate symbol for differentiation; I told you I was rusty 
)
) Travis wrote:
Oh, what about intergration (I think I mistook the integrate symbol for differentiation; I told you I was rusty )
Yep, it can integrate the area under a function between a low and high bound.
)Edit: Before we go crazy converting this, are you sure there isn't already a TI-83+/TI-84+ program that converts the surface area of a function revolved around an axis?
There are similar programs online but they done give the answer in terms of pi. This is the only one i've seen so far 
I have calculus program that gives the numerical and symbolic answer for the 84+ CSE. I will make a port of my program to the regular 83/84 calculator.
http://www.cemetech.net/programs/index.php?mode=file&id=961
http://www.cemetech.net/programs/index.php?mode=file&id=961
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