[Scilab-users] Plot Heart Curve in Scilab

[Stéphane Mottelet]

Hello,

Because of the sum of squares form there is also an easy parametric 
description of this curve :

t=linspace(0,2*%pi,1000);
x=cos(t);
y=(sin(t)+sqrt(abs(x)))/1.25;
plot(x,y)

S.

Le 28/09/2017 à 11:38, CRETE Denis a écrit :
> Hello,
> It is also possible to use the couple of solutions (auricle, ventricle) of Z=0:
> // Start of code
> nx=201;
> x=linspace(0,1,nx)'; // computation is done only for x=0 (it saves time for urgent needs!-)
> auricle=(sqrt(x)+sqrt(1-x.^2))/1.2;
> ventricle=(sqrt(x)-sqrt(1-x.^2))/1.2;
> X0=[x;x($:-1:1);-x;-x($:-1:1)];
> Y0=[auricle;ventricle($:-1:1);ventricle;auricle($:-1:1)];
> scf();
> // plot of a symmetrical polygone
> xset("color",5);
> xfpoly(X0,Y0);
> // End of code
>
> Thank you, I learned about "xfpoly" !
> Denis
>
> -----Message d'origine-----
> De : users [mailto:users-bounces at lists.scilab.org] De la part de Hermes
> Envoyé : mercredi 27 septembre 2017 22:29
> À : users at lists.scilab.org
> Objet : Re: [Scilab-users] Plot Heart Curve in Scilab
>
> Hi Rafa,
> Here I present the task solved:
> //start of code
> nx=300;
> ny=200;
> X0=linspace(-1.2,1.2,nx);
> Y0=linspace(-1.5,2,ny);
> X=X0.*.ones(ny,1);
> Y=(Y0.*.ones(nx,1))';
> Z=(1.25*Y-sqrt(abs(X))).^2+X.^2-1;
> clf()
> a=gca();
> a.x_label.text="X";
> a.y_label.text="Y";
> contour(X0,Y0,Z',[0,0]);
> *Polyline=a.children.children(1)
> Polyline.fill_mode="on";
> Polyline.foreground=5;
> Polyline.background=5;
> Polyline.thickness=2;*
> a.view="2d";
> //end code
>
> Two questions:
> in the Helps of Scilab, where can I find the hierarchy trees for the graphic objects?
> How do I copy from SciNote to the Forum scripts and maintain the format of it?
> Thank you
> Hermes
>
>
>
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-- 
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
http://www.utc.fr/~mottelet