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Fx-Cg10 Graphing Bug?


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#1 speedlever

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Posted 09 March 2016 - 04:51 PM

I am a new user of the CG10 Prizm which I bought for my son to use in high school. I ran across a graphing scenario which makes me think either the CG10 has a bug or the user doesn't know what he's doing (yet). ;)

 

The equation is:

(x-4)^2(x+3)(x-2)^3

 

For some reason, the CG10 is not showing the line of the graph to go through the left most root (-3,0). I checked it on WolframAlpha, Desmos, and also a Ti-84+C emulator I have on my Android. All show the graph properly except for the CG10. Note: WolframAlpha image is skewed by the Y scale.

 

KK1i6vl.jpg?1

 

Have I missed something on the CG10? If I tell it to find the roots, it finds -3 just fine, but there is no line going through that point.

 

 



#2 pan.gejt

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Posted 10 March 2016 - 08:08 AM

Have you tried to change V-Window or zoom?

Maybe it has to do with pixel dimension.

I tried to plot your function on 9860g Slim and tablet and in certain situations the almost vertical line on the left disappeared. 

 

I see the plot on my Slim with these settings (min, max, scale):

x: -4,6,1 (or -10,10,1)

y: -2350,2350,500 (or -5000,5000,1000)

 

 

I determined the minimum with fmin command (min = 2310) and used this as y-min

 

I lost the left part of plot when I set very low Y-coordinate, e.g. -10,10,1 or -100,100,10


Edited by pan.gejt, 10 March 2016 - 08:09 AM.


#3 speedlever

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Posted 10 March 2016 - 01:16 PM

Interesting. If I change the View window Y axis to -2350/+2350 and scale 500, the left part of the plot shows.

If I change those settings to +/- 1000 and 250, it still shows although the bottom part of the plot is off the scale.

+/- 100 and 50 also shows properly.

+/- 50 and 10 loses the left part of the plot again.

 

Doing some experimenting, I found that the plot shows again using +/-99, but drops off at +/-98. (scale 10). Y-axis changes only. I left the X-axis alone.

 

That seems rather odd behavior.


Edited by speedlever, 10 March 2016 - 01:17 PM.





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