Would someone be willing to help me develop an implicit function grapher for the TI-84 pce?
A pizza that has radius "z" and height "a" has volume Pi × z × z × a. 10!=The number of seconds in 42 days (coincidence? I think not)
A pizza that has radius "z" and height "a" has volume Pi × z × z × a. 10!=The number of seconds in 42 days (coincidence? I think not)
- 24 Jan 2018 10:31:36 pm
- Last edited by mr womp womp on 27 Jan 2018 06:01:47 pm; edited 1 time in total
I whipped up a little program, it is really bad (most functions wont work...) and painfully slow, and I stole weregoose's string replace routine.
Here it is
Code:
also, it doesn't really graph at all, it just draws a lot of points and pretends that that's somehow good enough
It seems to have a preference for things that have more than one y for each x, and those expressions seem to work more often, but I couldn't be bothered to figure out exactly what's going on.
Here are some sample drawings (when you don't get any error...)
X+Y²-1
2X+Y-1
Here it is
Code:
ClrAllLists
Input "F(X)=",Str1
Str1→Str3
For(X,Xmin,Xmax,0.3
length(toString(X→V
"("+Str3+")"→Str1
inString(Ans,"Y",2→W
While Ans
sub(Str1,1,W-1
If V:Ans+"("+toString(X)+")"
Ans+sub(Str1,1+W,length(Str1)-W→Str1
inString(Ans,"Y",V+W→W
End
Str1→Y₁
solve(Y₁,X,0,{-E99,E99
Ans→L₁(1+dim(L₁
X→L₂(1+dim(L₂
End
DelVar Y₁
Plot1(Scatter,L₁,L₂,•
DispGraphalso, it doesn't really graph at all, it just draws a lot of points and pretends that that's somehow good enough
It seems to have a preference for things that have more than one y for each x, and those expressions seem to work more often, but I couldn't be bothered to figure out exactly what's going on.
Here are some sample drawings (when you don't get any error...)
X+Y²-1
2X+Y-1
For a quick-and-dirty visual without the muss of variable manipulation, this program (for use on the color edition) evaluates at a fixed number of positions and assigns a gray color based on how close each answer came to zero. With both axes at -1 to 1, try Y1=abs(X)+abs(Y)-1 for a diamond, or (X²+Y²)²-2XY for a lemniscate.
Code:
Code:
FnOff
DispGraph
8ΔX→R
For(X,Xmin+2ΔX,Xmax,4ΔX
For(Y,Ymin+2ΔY,Ymax,4ΔY
abs(Y1
If Ans≤R
Then
round(25-4Ans/R,0
Pt-On(X,Y,1,Ans-13(Ans=25
End
End
End
Thanks a lot! They both look pretty cool. 
A pizza that has radius "z" and height "a" has volume Pi × z × z × a. 10!=The number of seconds in 42 days (coincidence? I think not)
- 25 Jan 2018 08:14:54 pm
- Last edited by Legoman314 on 27 Jan 2018 03:56:05 pm; edited 1 time in total
Tried them out, and Mr. Womp Womp's one gave an ERROR: Bound, and Weregoose's program gave an Invalid Token error when trying to transfer to calc. Any ideas?
A pizza that has radius "z" and height "a" has volume Pi × z × z × a. 10!=The number of seconds in 42 days (coincidence? I think not)
You should press Goto when the errors come up, and try fixing them yourself. 
I did this to learn Basic, and it helped. You don't need to if you don't want to.
I did this to learn Basic, and it helped. You don't need to if you don't want to.
Legoman314 wrote:
ERROR: Bound
The first part of {E99,E99} ought to be negative.
Legoman314 wrote:
Invalid Token error when trying to transfer to calc. Any ideas?
Must be the ΔX. Type it manually on your calculator with [VARS] [1] [8].
Thanks. Any chance of developing these into actual, working programs? 
A pizza that has radius "z" and height "a" has volume Pi × z × z × a. 10!=The number of seconds in 42 days (coincidence? I think not)
Legoman314 wrote:
Thanks. Any chance of developing these into actual, working programs?
It's not something I plan on doing, however, if you'd like to hammer out some problems and work on it a little, feel free to do so, I'm not very stingy about my code, especially when it's just a little piece like this.
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