Hi Anyone here with some experience of using DistMesh in finite element code? I m solving the scalar Helmoltz equation in an annular region in 2D: rho_1 < rho < rho_2 where rho_1 is the radius of a Perfect Electric Conducting cylinder and rho_2 is where the mesh is truncated using an Absorbing Boundary condition. Now, I ve written code to mesh the region myself (by dividing the region into annular rings and picking a fixed number of points on each ring) and I ve written another program which uses DistMesh to mesh the region. I get a nice solution using my own meshing code but the FEM matrix becomes singular when I use DistMesh. This is the DistMesh Code I used: Circle with hole rABC=1.5 rCyl=0.5 fdstring=sprintf( ddiff(dcircle(p,0,0, f),dcircle(p,0,0, f)) ,rABC,rCyl) fd=inline(fdstring, p ) box=[-2,-2 2,2] [p,N]=distmesh2d(fd,@huniform,0.04,box,[]) I tried changing box and the 0.04 value (initial edge length). But every time, the matrix becomes sin

boundedges.m
circumcenter.m
COPYRIGHT.TXT
dblock.m
dcircle.m
ddiff.m
dellipse.cpp
dellipse.dll
dellipse.mexglx
dellipsoid.cpp
dellipsoid.dll
dellipsoid.mexglx
dexpr.m
dintersect.m
distmesh2d.m
distmeshnd.m
dmatrix3d.m
dmatrix.m
dpoly.m
drectangle0.m
drectangle.m
dsegment.cpp
dsegment.dll
dsegment.mexglx
dsphere.m
dunion.m
fixmesh.m
hmatrix3d.m
hmatrix.m
huniform.m
meshdemo2d.m
meshdemond.m
mkt2t.m
protate.m
pshift.m
simpplot.m
simpqual.m
simpvol.m
surftri.m
uniformity.m

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