# Asking for help for solving nonlinear elliptic 2D

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Duong Pham on 14 Apr 2020
Dear all,
I try to solve the nonlinear elliptic equation .
with the boundary define like
Neuman condtion at Edge 1 =constant
Neuman condtion at Edge 2 4= 0
Dirchlet condtion at Edge E3 =0;
Moreover, the coeffcients c is zero at Nb and one at other node.
coefficinet a=0;
f=0;
The code for the problem geometry is like this
____________________________________
clc;
clear all
global Nb
rect1 = [3
4
0
1
1
0
0
0
1
1];
ns = char('rect1');
ns = ns';
sf = 'rect1';
gd=rect1;
g = decsg(gd,sf,ns);
model = createpde;
geometryFromEdges(model,g);
figure(1)
pdegplot(model,'EdgeLabels','on')
axis equal
xlim([-0.1,1.1])
ylim([-0.1,1.1])
mesh = generateMesh(model,'Hmax',0.05)
figure(2)
Nb = findNodes(mesh,'box',[0 0.5],[0.5-0.05/2 0.5+0.05/2]);
pdemesh(model)
hold on
plot(mesh.Nodes(1,Nb),mesh.Nodes(2,Nb),'or','MarkerFaceColor','g')
___________________________________
Thank you very much.
Sincerely,
Pham L.T. Duong

R2019b

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