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Re: Can you reproduce the 3D graph in the ticalc.org logo?

Fil
(Web Page)

Actually, I'm fairly certain that  no, wait. I was going to say that it was in the manual for the 89 somewhere, because I once had the formula for said graph, but that's wrong. I actually emailed TI about it and (whoa) somebody responded with the formula for the graph. I don't have it anymore, that was years ago with I still had a (gack) hotmail account.
If you want the formula, I suggest emailing TI's customer service or something similar to see if they'll send it to you.
Fil

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7 June 2003, 08:21 GMT


Re: Can you reproduce the 3D graph in the ticalc.org logo?

Frank A. Nothaft
(Web Page)

Here it is:
z(x,y)=20*cos((x^2+y^2)/4)/(x^2+y^2+pi)
With:
Eye theta: 20
Eye phi: 70
Eye psi: .41
xmin: 5.
xmax: 5.
xgrid: 20.
ymin: 5.
ymax: 5.
ygrid: 20.
zmin: 1.2953
zmax: 6.3662
ncontour=1.
Happy? :p

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7 June 2003, 15:39 GMT


Re: Can you reproduce the 3D graph in the ticalc.org logo?

Rayzer

No. I have heard the graph described as the 'water ripple' 3D graph. But I found on the internet somewhere that it takes about 45 minutes for a calc to make it...

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7 June 2003, 16:41 GMT


Re: Can you reproduce the 3D graph

C14Physicist
(Web Page)

I got:
(1/(sqrt(x^2+y^2))*sin(sqrt(x^2+y^2)) *155
Where the *155 is added simply to make it fit better in the window.
so the basic concept is:
sin(sqrt(x^2+y^2))/(sqrt(x^2+y^2))

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7 June 2003, 22:48 GMT


Re: Can you reproduce the 3D graph in the ticalc.org logo?

dishsoap1

I couldn't do it. But I have to say that it is a cool 3D Wire Graph.

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8 June 2003, 00:44 GMT


Re: Can you reproduce the 3D graph in the ticalc.org logo?

burntfuse

They seem really desperate for survey ideas. Maybe more people need to contribute them? And no, I can't reproduce the graph.

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8 June 2003, 16:08 GMT


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