# Execution error on creating border

**URL:** <https://community.freefem.org/t/execution-error-on-creating-border/1847>\
**Category:** General Discussion\
**Created:** [June 24, 2022, 11:20am UTC](https://community.freefem.org/t/execution-error-on-creating-border/1847 "2022-06-24T11:20:44Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Aashish](https://avatars.discourse-cdn.com/v4/letter/a/65b543/32.png) [@Aashish](https://community.freefem.org/u/Aashish)\
**Post date:** [June 24, 2022, 11:20am UTC](https://community.freefem.org/t/execution-error-on-creating-border/1847/1 "2022-06-24T11:20:45Z")

</div>

Hi ,

I am trying to build borders using vectors below is my sample code  
When i plot the borders everything looks exactly the way i wanted but on building mesh i get error

current line = 94  
Exec error : Error points border points to close \< diameter\*1e-7

int C1=99;  
int C2=98;

real coarseMeshC0Size = 50;  
real coarseMeshC3Size = 100;

real coarseMeshVectorSize = 2;  
real coarseMeshC12C14Size = 2.;

real finerMeshC0Size = 120.;

real imageZoomVal = 0.05;

real[int] vectorX0(coarseMeshC0Size),vectorY0(coarseMeshC0Size);  
real[int] vectorX3(coarseMeshC3Size),vectorY3(coarseMeshC3Size);

real[int] vectorX11(coarseMeshVectorSize),vectorY11(coarseMeshVectorSize);  
real[int] vectorX12(coarseMeshVectorSize),vectorY12(coarseMeshVectorSize);  
real[int] vectorX13(coarseMeshVectorSize),vectorY13(coarseMeshVectorSize);  
real[int] vectorX14(coarseMeshVectorSize),vectorY14(coarseMeshVectorSize);

real[int] vectorX21(coarseMeshVectorSize),vectorY21(coarseMeshVectorSize);  
real[int] vectorX22(coarseMeshVectorSize),vectorY22(coarseMeshVectorSize);  
real[int] vectorX23(coarseMeshVectorSize),vectorY23(coarseMeshVectorSize);  
real[int] vectorX24(coarseMeshVectorSize),vectorY24(coarseMeshVectorSize);

real deltaT = 2\*pi/(coarseMeshC0Size-1);

for(int i=0;i\<coarseMeshC0Size;i++){  
real t = i_deltaT;  
vectorX0[i] = 5_cos(t);  
vectorY0[i] = 5\*sin(t);  
}

real deltaT2 = 2\*pi/(coarseMeshC3Size-1);

for(int i=0;i\<coarseMeshC3Size;i++){  
real t = i_deltaT2;  
vectorX3[i] = 5_cos(t);  
vectorY3[i] = 5\*sin(t);  
}

//Rectangle 1  
for(int i=0;i\<=1;i++){  
vectorX11[i] = 1+i;  
vectorY11[i] =3;  
}

for(int i=0;i\<=1;i++){  
vectorX12[i] = 2;  
vectorY12[i] =3-6\*i;

}  
for(int i=0;i\<=1;i++){  
vectorX13[i] = 2-i;  
vectorY13[i] = -3;  
}

for(int i=0;i\<=1;i++){  
vectorX14[i] = 1;  
vectorY14[i] = -3+6\*i;  
}

//Rectangle 2

for(int i=0;i\<=1;i++){  
vectorX21[i] = -2+i;  
vectorY21[i] =3;  
}

for(int i=0;i\<=1;i++){  
vectorX22[i] = -1;  
vectorY22[i] =3-6\*i;

}  
for(int i=0;i\<=1;i++){  
vectorX23[i] = -1-i;  
vectorY23[i] = -3;  
}

for(int i=0;i\<=1;i++){  
vectorX24[i] = -2;  
vectorY24[i] = -3+6\*i;  
}

try{  
border C0(t=0, vectorX0.n-1){P.x=vectorX0[t]; P.y=vectorY0[t];}

border C11(t=0, vectorX11.n-1){P.x=vectorX11[t]; P.y=vectorY11[t];label=C1;}  
border C12(t=0, vectorX12.n-1){P.x=vectorX12[t]; P.y=vectorY12[t];label=C1;}  
border C13(t=0, vectorX13.n-1){P.x=vectorX13[t]; P.y=vectorY13[t];label=C1;}  
border C14(t=0, vectorX14.n-1){P.x=vectorX14[t]; P.y=vectorY14[t];label=C1;}

border C21(t=0, vectorX21.n-1){P.x=vectorX21[t]; P.y=vectorY21[t];label=C2;}  
border C22(t=0, vectorX22.n-1){P.x=vectorX22[t]; P.y=vectorY22[t];label=C2;}  
border C23(t=0, vectorX23.n-1){P.x=vectorX23[t]; P.y=vectorY23[t];label=C2;}  
border C24(t=0, vectorX24.n-1){P.x=vectorX24[t]; P.y=vectorY24[t];label=C2;}

plot( C0(50)+ C11(5)+C12(20)+C13(5)+C14(20)+ C21(5)+C22(20)+C23(5)+C24(20),  
wait=true);

mesh m1 = buildmesh(C0(50)+ C11(5)+C12(20)+C13(5)+C14(20)+ C21(5)+C22(20)+C23(5)+C24(20));  
}  
catch(…) { //catch all error  
cout \<\< “Catch an ExecError” \<\< endl;  
}