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## Re: Folium of Descartes

**From**: |
Giovanni Lovato |

**Subject**: |
Re: Folium of Descartes |

**Date**: |
Mon, 19 Nov 2007 19:28:50 +0100 |

**User-agent**: |
Thunderbird 2.0.0.6 (X11/20071022) |

Muthiah Annamalai wrote:
>* On Nov 16, 2007 1:45 PM, Giovanni Lovato <address@hidden> wrote:*
>*> Muthiah Annamalai wrote:*
>*>> Giovanni Lovato wrote:*
>*>>> How can I draw the Folium of Descartes in Octave?*
>*>>> In Matlab I did:*
>*>>>*
>*>>>*
>*>>>>> f = sym('x^3-x^2+y^2');*
>*>>>>> ezplot(f)*
>*>>>>>*
>*>>> Various Octave tutorials explain how to draw simple functions in one*
>*>>> variable, but I can't find a way to draw functions in two (or more)*
>*>>> variables.*
>*>>> I'm a very newbie of Octave (and Matlab too), maybe it's silly*
>*>>> questions - in this case, sorry :)*
>*>>>*
>*>>> Thanks in advance,*
>*>>> G.L.*
>*>>>*
>*>> Apparently the right (I dont have Matlab, so I assume here) way, to do*
>*>> this is*
>*>>*
>*>> func = inline ( vectorize ( 'x^3-x^2+y^2' ) );*
>*>> y = linspace(-2*pi, + 2*pi, 100);*
>*>> x = y;*
>*>>*
>*>> z = func(x,y);*
>*>> plot3 (x,y,z)*
>*> Thank you for the interest!*
>*> BTW the plot won't display a folium-like curve, but a totally different*
>*> (I think!) curve.*
[CUT]
>*>*
>* *
>* Im sorry for flooding the list. I am using a new mail client, but*
>* thats no excuse.*
>* I think you want to plot the 'implicit' functions here in the ezlpot().*
>* I think I missed that point earlier.*
Yes sorry, I didn't explain well (and I'm not so cute in speaking English)!
I would be able to draw the implicit function F[X,Y] : X^3-X^2+Y^2 = 0
like ezplot() in Matlab does. I thought there was a simple and common
solution on doing it, but if this is a weird request I'll try to draw it
manually with a vector-graphics tool.
Meanwhile I'll remain tuned on this list to catch any other hint :)
Thank you!
G.L.
--
mail: address@hidden
web: http://heruan.my.aldu.net

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