geometrie/src/fem_segment2.cpp

//------------------------------------------------------------
//------------------------------------------------------------
//  MAGiC
//  Jean Christophe Cuilli�re et Vincent FRANCOIS
//  D�partement de G�nie M�canique - UQTR
//------------------------------------------------------------
//  Le projet MAGIC est un projet de recherche du d�partement
//  de g�nie m�canique de l'Universit� du Qu�bec �
//  Trois Rivi�res
//  Les librairies ne peuvent �tre utilis�es sans l'accord
//  des auteurs (contact : francois@uqtr.ca)
//------------------------------------------------------------
//------------------------------------------------------------
//
//       fem_element12.cpp
//
//------------------------------------------------------------
//------------------------------------------------------------
//  COPYRIGHT 2000
//  Version du 02/03/2006 � 11H22
//------------------------------------------------------------
//------------------------------------------------------------


#include "gestionversion.h"
#include "fem_segment2.h"
#include "fem_noeud.h"
#include "fem_maillage.h"
#include "mg_element_maillage.h"

FEM_SEGMENT2::FEM_SEGMENT2(unsigned long num,class MG_ELEMENT_MAILLAGE* mai,class FEM_NOEUD** tabnoeud):FEM_ELEMENT1(num,mai),FEM_TEMPLATE_ELEMENT<2>(tabnoeud)
{
    tab[0]->get_lien_element1()->ajouter(this);
    tab[1]->get_lien_element1()->ajouter(this);
    get_fem_noeudpetitid()->get_lien_petit_element1()->ajouter(this);
    if (liaison_topologique!=NULL) if (liaison_topologique->get_dimension()==1) liaison_topologique->get_lien_fem_maillage()->ajouter(this);
    
}
FEM_SEGMENT2::FEM_SEGMENT2(unsigned long num,class MG_ELEMENT_TOPOLOGIQUE* topo,class MG_ELEMENT_MAILLAGE* mai,class FEM_NOEUD** tabnoeud):FEM_ELEMENT1(num,topo,mai),FEM_TEMPLATE_ELEMENT<2>(tabnoeud)
{
    tab[0]->get_lien_element1()->ajouter(this);
    tab[1]->get_lien_element1()->ajouter(this);
    get_fem_noeudpetitid()->get_lien_petit_element1()->ajouter(this);
    if (liaison_topologique!=NULL) if (liaison_topologique->get_dimension()==1) liaison_topologique->get_lien_fem_maillage()->ajouter(this);
    
}

FEM_SEGMENT2::FEM_SEGMENT2(class MG_ELEMENT_TOPOLOGIQUE* topo,class FEM_NOEUD** tabnoeud):FEM_ELEMENT1(topo),FEM_TEMPLATE_ELEMENT<2>(tabnoeud)
{
    tab[0]->get_lien_element1()->ajouter(this);
    tab[1]->get_lien_element1()->ajouter(this);
    get_fem_noeudpetitid()->get_lien_petit_element1()->ajouter(this);
    if (liaison_topologique!=NULL) if (liaison_topologique->get_dimension()==1) liaison_topologique->get_lien_fem_maillage()->ajouter(this);
    
}
FEM_SEGMENT2::FEM_SEGMENT2(class MG_ELEMENT_MAILLAGE* mai,FEM_NOEUD** tabnoeud):FEM_ELEMENT1(mai),FEM_TEMPLATE_ELEMENT<2>(tabnoeud)
{
    tab[0]->get_lien_element1()->ajouter(this);
    tab[1]->get_lien_element1()->ajouter(this);
    get_fem_noeudpetitid()->get_lien_petit_element1()->ajouter(this);
    if (liaison_topologique!=NULL) if (liaison_topologique->get_dimension()==1) liaison_topologique->get_lien_fem_maillage()->ajouter(this);
    
}

FEM_SEGMENT2::FEM_SEGMENT2(FEM_SEGMENT2& mdd):FEM_ELEMENT1(mdd),FEM_TEMPLATE_ELEMENT<2>(mdd)
{
    tab[0]->get_lien_element1()->ajouter(this);
    tab[1]->get_lien_element1()->ajouter(this);
    get_fem_noeudpetitid()->get_lien_petit_element1()->ajouter(this);
    if (liaison_topologique!=NULL) if (liaison_topologique->get_dimension()==1) liaison_topologique->get_lien_fem_maillage()->ajouter(this);
    
}

FEM_SEGMENT2::~FEM_SEGMENT2()
{
    if (liaison_topologique==NULL) return;
    if (liaison_topologique->get_dimension()==0) liaison_topologique->get_lien_fem_maillage()->supprimer(this);
    tab[0]->get_lien_element1()->supprimer(this);
    tab[1]->get_lien_element1()->supprimer(this);
    get_fem_noeudpetitid()->get_lien_petit_element1()->supprimer(this);
}

FEM_ELEMENT_MAILLAGE* FEM_SEGMENT2::dupliquer(FEM_MAILLAGE *femmai,long decalage)
{
    FEM_NOEUD* tabnoeud[2];
    tabnoeud[0]=femmai->get_fem_noeudid(tab[0]->get_id()+decalage);
    tabnoeud[1]=femmai->get_fem_noeudid(tab[1]->get_id()+decalage);
    FEM_SEGMENT2* seg=new FEM_SEGMENT2(get_id()+decalage,maillage,tabnoeud);
    femmai->ajouter_fem_element1(seg);
    return seg;
}

bool FEM_SEGMENT2::valide_parametre_EF(double* uvw)
{
if (uvw[0]>=-1e-10)
     if (uvw[0]<=1.+1e-10)  
          return true;
return false;
}


int FEM_SEGMENT2::get_type_entite(void)
{
    return   IDFEM_SEGMENT2;
}

int FEM_SEGMENT2::get_dimension(void)
{
    return 1;
}


int FEM_SEGMENT2::get_nb_fem_noeud(void)
{
    return FEM_TEMPLATE_ELEMENT<2>::get_nb_fem_noeud();
}

FEM_NOEUD* FEM_SEGMENT2::get_fem_noeud(int num)
{
    return FEM_TEMPLATE_ELEMENT<2>::get_fem_noeud(num);
}

void FEM_SEGMENT2::change_noeud(int num,FEM_NOEUD* noeud)
{
    FEM_TEMPLATE_ELEMENT<2>::change_noeud(num,noeud);
}

BOITE_3D& FEM_SEGMENT2::get_boite_3D(void)
{
    return FEM_TEMPLATE_ELEMENT<2>::get_boite_3D();
}


void FEM_SEGMENT2::enregistrer(std::ostream& o)
{
    if (maillage!=NULL)
      if (get_lien_topologie()!=NULL) o << "%" << get_id() << "=FEM_SEGMENT2($"<< get_lien_topologie()->get_id() << ",$"<< maillage->get_id() << ",$" << tab[0]->get_id() << ",$" << tab[1]->get_id() <<    ");" << std::endl;
    else o << "%" << get_id() << "=FEM_SEGMENT2(NULL,$" << maillage->get_id() <<",$" << tab[0]->get_id() << ",$" << tab[1]->get_id() << ");" << std::endl;
    if (maillage==NULL)
      if (get_lien_topologie()!=NULL) o << "%" << get_id() << "=FEM_SEGMENT2($"<< get_lien_topologie()->get_id() << ",NULL,$" << tab[0]->get_id() << ",$" << tab[1]->get_id() <<    ");" << std::endl;
    else o << "%" << get_id() << "=FEM_SEGMENT2(NULL,NULL,$" << tab[0]->get_id() << ",$" << tab[1]->get_id() << ");" << std::endl;
}


int FEM_SEGMENT2::get_nb_pt_gauss(int degre)
{
if (degre<2) return 1;
if (degre<4) return 2;
if (degre<6) return 3;
if (degre<8) return 4;
if (degre<10) return 5;
if (degre<12) return 6;
if (degre<14) return 7;
return 0;  
}

void FEM_SEGMENT2::get_pt_gauss(int degre,int num,double &w,double *u)
{
if (degre<2)  
    {
    if (num==0)  {w=2;u[0]=0;}
    return;
    }
if (degre<4)  
    {
    if (num==0)  {w=1;u[0]=-0.577350269189626;}
    if (num==1)  {w=1;u[0]=0.577350269189626;}
    return;
    }
if (degre<6)  
    {
    if (num==0)  {w=0.888888888888889;u[0]=0.;}
    if (num==1)  {w=0.555555555555556;u[0]=-0.774596669241483;}
    if (num==2)  {w=0.555555555555556;u[0]=0.774596669241483;}
    return;
    }
if (degre<8)  
    {
    if (num==0)  {w=0.652145154862546;u[0]=-0.339981043584856;}
    if (num==1)  {w=0.652145154862546;u[0]=0.339981043584856;}
    if (num==2)  {w=0.347854845137454;u[0]=-0.861136311594053;}
    if (num==3)  {w=0.347854845137454;u[0]=0.861136311594053;}
    return;
    }
if (degre<10)  
    {
    if (num==0)  {w=0.568888888888889;u[0]=0.;}
    if (num==1)  {w=0.478628670499366;u[0]=-0.538469310105683;}
    if (num==2)  {w=0.478628670499366;u[0]=0.538469310105683;}
    if (num==3)  {w=0.236926885056189;u[0]=-0.906179845938664;}
    if (num==4)  {w=0.236926885056189;u[0]=0.906179845938664;}
    return;
    }
if (degre<12)  
    {
    if (num==0)  {w=0.467913934572691;u[0]=-0.238619186083197;}
    if (num==1)  {w=0.467913934572691;u[0]=0.238619186083197;}
    if (num==2)  {w=0.360761573048139;u[0]=-0.661209386466265;}
    if (num==3)  {w=0.360761573048139;u[0]=0.661209386466265;}
    if (num==4)  {w=0.171324492379170;u[0]=-0.932469514203152;}
    if (num==5)  {w=0.171324492379170;u[0]=0.932469514203152;}
    return;
    }
if (degre<14)  
    {
    if (num==0)  {w=0.417959183673469;u[0]=0;}
    if (num==1)  {w=0.381830050505119;u[0]=-0.405845151377397;}
    if (num==2)  {w=0.381830050505119;u[0]=0.405845151377397;}
    if (num==3)  {w=0.279705391489277;u[0]=-0.741531185599394;}
    if (num==4)  {w=0.279705391489277;u[0]=0.741531185599394;}
    if (num==5)  {w=0.129484966168870;u[0]=-0.949107912342759;}
    if (num==6)  {w=0.129484966168870;u[0]=0.949107912342759;}
    return;
    }
}
    

int FEM_SEGMENT2::nb_fonction_interpolation(void)
{
    return 2;
}

double FEM_SEGMENT2::get_fonction_interpolation(int num,double *uv)
{
    double val;
    switch (num)
    {
    case 1:
        val=0.5*(1.-uv[0]);
        break;
    case 2:
        val=0.5*(1.+uv[0]);
        break;
    }
    return val;
}

double FEM_SEGMENT2::get_fonction_derive_interpolation(int num,int num_variable,double *uv)
{
    double val;

    switch (num)
    {
    case 1:
        switch (num_variable)
        {
        case 1:
            val=-0.5;
            break;
        case 2:
            val=-0.5;
            break;
        } 
        break;
    
    }
    return val;
}

double FEM_SEGMENT2::get_jacobien(double* jac,double *uv,int& li,int& col,double unite)
{
    /*li=1;
    col=1;
    double *xyz1=tab[0]->get_coord();
    double *xyz2=tab[1]->get_coord();
    
    jac[0]=0.5*unite*(xyz2[0] - xyz1[0])  ;
    
    
    return jac[0];*/
}

void FEM_SEGMENT2::get_inverse_jacob(double* j,double *uv,double unite)
{
    /*double *xyz1=tab[0]->get_coord();
    double *xyz2=tab[1]->get_coord();
    
    j[0]=1./(0.5*unite*(xyz2[0] - xyz1[0]))  ;*/
}
Revision:	637
Committed:	Mon Jan 26 21:26:37 2015 UTC (10 years, 3 months ago) by francois
File size:	9127 byte(s)
Log Message:	entree des points de gauss pour les différents éléments finis depuis reference JCC
#	User	Rev	Content
1	francois	283	//------------------------------------------------------------
2			//------------------------------------------------------------
3			// MAGiC
4			// Jean Christophe Cuilli�re et Vincent FRANCOIS
5			// D�partement de G�nie M�canique - UQTR
6			//------------------------------------------------------------
7			// Le projet MAGIC est un projet de recherche du d�partement
8			// de g�nie m�canique de l'Universit� du Qu�bec �
9			// Trois Rivi�res
10			// Les librairies ne peuvent �tre utilis�es sans l'accord
11			// des auteurs (contact : francois@uqtr.ca)
12			//------------------------------------------------------------
13			//------------------------------------------------------------
14			//
15	francois	309	// fem_element12.cpp
16	francois	283	//
17			//------------------------------------------------------------
18			//------------------------------------------------------------
19			// COPYRIGHT 2000
20			// Version du 02/03/2006 � 11H22
21			//------------------------------------------------------------
22			//------------------------------------------------------------
23
24
25			#include "gestionversion.h"
26			#include "fem_segment2.h"
27			#include "fem_noeud.h"
28			#include "fem_maillage.h"
29			#include "mg_element_maillage.h"
30
31	francois	309	FEM_SEGMENT2::FEM_SEGMENT2(unsigned long num,class MG_ELEMENT_MAILLAGE* mai,class FEM_NOEUD** tabnoeud):FEM_ELEMENT1(num,mai),FEM_TEMPLATE_ELEMENT<2>(tabnoeud)
32	francois	283	{
33	francois	378	tab[0]->get_lien_element1()->ajouter(this);
34			tab[1]->get_lien_element1()->ajouter(this);
35			get_fem_noeudpetitid()->get_lien_petit_element1()->ajouter(this);
36	francois	283	if (liaison_topologique!=NULL) if (liaison_topologique->get_dimension()==1) liaison_topologique->get_lien_fem_maillage()->ajouter(this);
37	francois	378
38			}
39			FEM_SEGMENT2::FEM_SEGMENT2(unsigned long num,class MG_ELEMENT_TOPOLOGIQUE* topo,class MG_ELEMENT_MAILLAGE* mai,class FEM_NOEUD** tabnoeud):FEM_ELEMENT1(num,topo,mai),FEM_TEMPLATE_ELEMENT<2>(tabnoeud)
40			{
41	francois	309	tab[0]->get_lien_element1()->ajouter(this);
42			tab[1]->get_lien_element1()->ajouter(this);
43			get_fem_noeudpetitid()->get_lien_petit_element1()->ajouter(this);
44	francois	378	if (liaison_topologique!=NULL) if (liaison_topologique->get_dimension()==1) liaison_topologique->get_lien_fem_maillage()->ajouter(this);
45
46	francois	283	}
47
48	francois	378	FEM_SEGMENT2::FEM_SEGMENT2(class MG_ELEMENT_TOPOLOGIQUE* topo,class FEM_NOEUD** tabnoeud):FEM_ELEMENT1(topo),FEM_TEMPLATE_ELEMENT<2>(tabnoeud)
49			{
50			tab[0]->get_lien_element1()->ajouter(this);
51			tab[1]->get_lien_element1()->ajouter(this);
52			get_fem_noeudpetitid()->get_lien_petit_element1()->ajouter(this);
53			if (liaison_topologique!=NULL) if (liaison_topologique->get_dimension()==1) liaison_topologique->get_lien_fem_maillage()->ajouter(this);
54
55			}
56	francois	309	FEM_SEGMENT2::FEM_SEGMENT2(class MG_ELEMENT_MAILLAGE* mai,FEM_NOEUD** tabnoeud):FEM_ELEMENT1(mai),FEM_TEMPLATE_ELEMENT<2>(tabnoeud)
57	francois	283	{
58	francois	309	tab[0]->get_lien_element1()->ajouter(this);
59			tab[1]->get_lien_element1()->ajouter(this);
60			get_fem_noeudpetitid()->get_lien_petit_element1()->ajouter(this);
61	francois	378	if (liaison_topologique!=NULL) if (liaison_topologique->get_dimension()==1) liaison_topologique->get_lien_fem_maillage()->ajouter(this);
62
63	francois	283	}
64
65	francois	309	FEM_SEGMENT2::FEM_SEGMENT2(FEM_SEGMENT2& mdd):FEM_ELEMENT1(mdd),FEM_TEMPLATE_ELEMENT<2>(mdd)
66	francois	283	{
67	francois	309	tab[0]->get_lien_element1()->ajouter(this);
68			tab[1]->get_lien_element1()->ajouter(this);
69			get_fem_noeudpetitid()->get_lien_petit_element1()->ajouter(this);
70	francois	378	if (liaison_topologique!=NULL) if (liaison_topologique->get_dimension()==1) liaison_topologique->get_lien_fem_maillage()->ajouter(this);
71
72	francois	283	}
73
74			FEM_SEGMENT2::~FEM_SEGMENT2()
75			{
76			if (liaison_topologique==NULL) return;
77			if (liaison_topologique->get_dimension()==0) liaison_topologique->get_lien_fem_maillage()->supprimer(this);
78	francois	309	tab[0]->get_lien_element1()->supprimer(this);
79			tab[1]->get_lien_element1()->supprimer(this);
80			get_fem_noeudpetitid()->get_lien_petit_element1()->supprimer(this);
81	francois	283	}
82
83			FEM_ELEMENT_MAILLAGE* FEM_SEGMENT2::dupliquer(FEM_MAILLAGE *femmai,long decalage)
84			{
85			FEM_NOEUD* tabnoeud[2];
86			tabnoeud[0]=femmai->get_fem_noeudid(tab[0]->get_id()+decalage);
87			tabnoeud[1]=femmai->get_fem_noeudid(tab[1]->get_id()+decalage);
88			FEM_SEGMENT2* seg=new FEM_SEGMENT2(get_id()+decalage,maillage,tabnoeud);
89	francois	309	femmai->ajouter_fem_element1(seg);
90	francois	283	return seg;
91			}
92
93	francois	635	bool FEM_SEGMENT2::valide_parametre_EF(double* uvw)
94			{
95			if (uvw[0]>=-1e-10)
96			if (uvw[0]<=1.+1e-10)
97			return true;
98			return false;
99			}
100	francois	283
101
102
103			int FEM_SEGMENT2::get_type_entite(void)
104			{
105			return IDFEM_SEGMENT2;
106			}
107
108			int FEM_SEGMENT2::get_dimension(void)
109			{
110			return 1;
111			}
112
113
114
115			int FEM_SEGMENT2::get_nb_fem_noeud(void)
116			{
117			return FEM_TEMPLATE_ELEMENT<2>::get_nb_fem_noeud();
118			}
119
120			FEM_NOEUD* FEM_SEGMENT2::get_fem_noeud(int num)
121			{
122			return FEM_TEMPLATE_ELEMENT<2>::get_fem_noeud(num);
123			}
124
125			void FEM_SEGMENT2::change_noeud(int num,FEM_NOEUD* noeud)
126			{
127			FEM_TEMPLATE_ELEMENT<2>::change_noeud(num,noeud);
128			}
129
130			BOITE_3D& FEM_SEGMENT2::get_boite_3D(void)
131			{
132			return FEM_TEMPLATE_ELEMENT<2>::get_boite_3D();
133			}
134
135
136			void FEM_SEGMENT2::enregistrer(std::ostream& o)
137			{
138	francois	378	if (maillage!=NULL)
139			if (get_lien_topologie()!=NULL) o << "%" << get_id() << "=FEM_SEGMENT2($"<< get_lien_topologie()->get_id() << ",$"<< maillage->get_id() << ",$" << tab[0]->get_id() << ",$" << tab[1]->get_id() << ");" << std::endl;
140	francois	283	else o << "%" << get_id() << "=FEM_SEGMENT2(NULL,$" << maillage->get_id() <<",$" << tab[0]->get_id() << ",$" << tab[1]->get_id() << ");" << std::endl;
141	francois	378	if (maillage==NULL)
142			if (get_lien_topologie()!=NULL) o << "%" << get_id() << "=FEM_SEGMENT2($"<< get_lien_topologie()->get_id() << ",NULL,$" << tab[0]->get_id() << ",$" << tab[1]->get_id() << ");" << std::endl;
143			else o << "%" << get_id() << "=FEM_SEGMENT2(NULL,NULL,$" << tab[0]->get_id() << ",$" << tab[1]->get_id() << ");" << std::endl;
144	francois	283	}
145	francois	310
146
147	francois	637	int FEM_SEGMENT2::get_nb_pt_gauss(int degre)
148			{
149			if (degre<2) return 1;
150			if (degre<4) return 2;
151			if (degre<6) return 3;
152			if (degre<8) return 4;
153			if (degre<10) return 5;
154			if (degre<12) return 6;
155			if (degre<14) return 7;
156			return 0;
157			}
158
159			void FEM_SEGMENT2::get_pt_gauss(int degre,int num,double &w,double *u)
160			{
161			if (degre<2)
162			{
163			if (num==0) {w=2;u[0]=0;}
164			return;
165			}
166			if (degre<4)
167			{
168			if (num==0) {w=1;u[0]=-0.577350269189626;}
169			if (num==1) {w=1;u[0]=0.577350269189626;}
170			return;
171			}
172			if (degre<6)
173			{
174			if (num==0) {w=0.888888888888889;u[0]=0.;}
175			if (num==1) {w=0.555555555555556;u[0]=-0.774596669241483;}
176			if (num==2) {w=0.555555555555556;u[0]=0.774596669241483;}
177			return;
178			}
179			if (degre<8)
180			{
181			if (num==0) {w=0.652145154862546;u[0]=-0.339981043584856;}
182			if (num==1) {w=0.652145154862546;u[0]=0.339981043584856;}
183			if (num==2) {w=0.347854845137454;u[0]=-0.861136311594053;}
184			if (num==3) {w=0.347854845137454;u[0]=0.861136311594053;}
185			return;
186			}
187			if (degre<10)
188			{
189			if (num==0) {w=0.568888888888889;u[0]=0.;}
190			if (num==1) {w=0.478628670499366;u[0]=-0.538469310105683;}
191			if (num==2) {w=0.478628670499366;u[0]=0.538469310105683;}
192			if (num==3) {w=0.236926885056189;u[0]=-0.906179845938664;}
193			if (num==4) {w=0.236926885056189;u[0]=0.906179845938664;}
194			return;
195			}
196			if (degre<12)
197			{
198			if (num==0) {w=0.467913934572691;u[0]=-0.238619186083197;}
199			if (num==1) {w=0.467913934572691;u[0]=0.238619186083197;}
200			if (num==2) {w=0.360761573048139;u[0]=-0.661209386466265;}
201			if (num==3) {w=0.360761573048139;u[0]=0.661209386466265;}
202			if (num==4) {w=0.171324492379170;u[0]=-0.932469514203152;}
203			if (num==5) {w=0.171324492379170;u[0]=0.932469514203152;}
204			return;
205			}
206			if (degre<14)
207			{
208			if (num==0) {w=0.417959183673469;u[0]=0;}
209			if (num==1) {w=0.381830050505119;u[0]=-0.405845151377397;}
210			if (num==2) {w=0.381830050505119;u[0]=0.405845151377397;}
211			if (num==3) {w=0.279705391489277;u[0]=-0.741531185599394;}
212			if (num==4) {w=0.279705391489277;u[0]=0.741531185599394;}
213			if (num==5) {w=0.129484966168870;u[0]=-0.949107912342759;}
214			if (num==6) {w=0.129484966168870;u[0]=0.949107912342759;}
215			return;
216			}
217			}
218
219
220	francois	310	int FEM_SEGMENT2::nb_fonction_interpolation(void)
221			{
222			return 2;
223			}
224
225			double FEM_SEGMENT2::get_fonction_interpolation(int num,double *uv)
226			{
227			double val;
228			switch (num)
229			{
230			case 1:
231			val=0.5*(1.-uv[0]);
232			break;
233			case 2:
234			val=0.5*(1.+uv[0]);
235			break;
236			}
237			return val;
238			}
239
240			double FEM_SEGMENT2::get_fonction_derive_interpolation(int num,int num_variable,double *uv)
241			{
242			double val;
243
244			switch (num)
245			{
246			case 1:
247			switch (num_variable)
248			{
249			case 1:
250			val=-0.5;
251			break;
252			case 2:
253			val=-0.5;
254			break;
255			}
256			break;
257
258			}
259			return val;
260			}
261
262			double FEM_SEGMENT2::get_jacobien(double* jac,double *uv,int& li,int& col,double unite)
263			{
264			/*li=1;
265			col=1;
266			double *xyz1=tab[0]->get_coord();
267			double *xyz2=tab[1]->get_coord();
268
269			jac[0]=0.5unite(xyz2[0] - xyz1[0]) ;
270
271
272
273			return jac[0];*/
274			}
275
276			void FEM_SEGMENT2::get_inverse_jacob(double* j,double *uv,double unite)
277			{
278			/double xyz1=tab[0]->get_coord();
279			double *xyz2=tab[1]->get_coord();
280
281			j[0]=1./(0.5unite(xyz2[0] - xyz1[0])) ;*/
282			}