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Files Posted by Darren View all
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12 Oct 2009 Screenshot MESH2D - Automatic Mesh Generation Generates unstructured triangular meshes for general 2D geometry. Author: Darren Engwirda modeling, simulation, fem, fvm, mathematics, mesh generation 206 3
  • 5.0
5.0 | 1 rating
03 Dec 2007 Screenshot Fast points-in-polygon test Fast test to determine points located inside general polygon regions. Should be significantly faster Author: Darren Engwirda polygon, points inside polygon, inpolygon, image processing 97 14
  • 4.3
4.3 | 11 ratings
30 Nov 2006 Screenshot tinterp - an alternative to griddata Linear and quadratic interpolation for scattered data Author: Darren Engwirda interpolation, data sets, linear, scattered interpolati..., quadratic, tinterp 36 3
  • 5.0
5.0 | 3 ratings
15 May 2006 Screenshot Contours for triangular grids Generate smooth contours for functions defined on unstructured triangular grids Author: Darren Engwirda graphics, mesh, unstructured, plotting, specialized, contours 60 6
  • 5.0
5.0 | 9 ratings
03 Apr 2006 Fast sparse matrix vector product sparse matrix vector product Author: Darren Engwirda matrix, linear algebra, sparse, product, vector 21 6
  • 4.0
4.0 | 4 ratings
Comments and Ratings by Darren
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14 Oct 2009 MESH2D - Automatic Mesh Generation Generates unstructured triangular meshes for general 2D geometry. Author: Darren Engwirda

Author comment: v24 was posted to resolve a licence conflict. The Mathworks no longer allows code to be released under a GNU GPL, so this has been removed for v24.

There are some (minor) revisions to the code, based on user feedback. Specifically, v24 may be slightly slower than v23, but should generally produce higher quality meshes, especially for complex geometries.

Comments/feedback is always welcome - d_engwirda@hotmail.com
Comments and Ratings on Darren's Files View all
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18 Oct 2009 MESH2D - Automatic Mesh Generation Generates unstructured triangular meshes for general 2D geometry. Author: Darren Engwirda Karaoulis, Marios

18 Oct 2009 MESH2D - Automatic Mesh Generation Generates unstructured triangular meshes for general 2D geometry. Author: Darren Engwirda Karaoulis, Marios

Do you have any thoughts going 3D?

14 Oct 2009 MESH2D - Automatic Mesh Generation Generates unstructured triangular meshes for general 2D geometry. Author: Darren Engwirda Engwirda, Darren

Author comment: v24 was posted to resolve a licence conflict. The Mathworks no longer allows code to be released under a GNU GPL, so this has been removed for v24.

There are some (minor) revisions to the code, based on user feedback. Specifically, v24 may be slightly slower than v23, but should generally produce higher quality meshes, especially for complex geometries.

Comments/feedback is always welcome - d_engwirda@hotmail.com
14 Oct 2009 MESH2D - Automatic Mesh Generation Generates unstructured triangular meshes for general 2D geometry. Author: Darren Engwirda Karaoulis, Marios

Hi, thanks again for your software. What's new in this version ( i am using v23).

07 Sep 2009 tinterp - an alternative to griddata Linear and quadratic interpolation for scattered data Author: Darren Engwirda lopez, carlos

I would like to have more information of the theory behind this. What it means that it is "quadratic"? Should it be exact for 2nd. degree functions? I tried this
X=[1:10 1:10];Y=[zeros(1,10) ones(1,10)];%Data points
f=100*(X').^2; %data points
tri=delaunay(X,Y);%Triangulation
triplot(tri,X,Y) %to interpret the case
x=linspace(0,11,300);y=repmat(0.5,1,300);
fC=tinterp([X' Y'],tri,f,x,y,'quadratic');
plot(diff(fC));%should be linear if the interpolant is exact for 2nd degree

Apparently from this example the interpolant is C0 (i.e. continuous but not differentiable), but it is a little bit misleading what is meant by "quadratic".

I tried to contact the author before posting, but apparently changed addres. Thank you anyway for his contribution.
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linear algebra, mathematics, 2d, approximation, contours
Files Tagged by Darren View all
  • 1 - 5 of
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Updated   File Tags Downloads
(last 30 days) 		Comments Rating
12 Oct 2009 Screenshot MESH2D - Automatic Mesh Generation Generates unstructured triangular meshes for general 2D geometry. Author: Darren Engwirda modeling, simulation, fem, fvm, mathematics, mesh generation 206 3
  • 5.0
5.0 | 1 rating
03 Dec 2007 Screenshot Fast points-in-polygon test Fast test to determine points located inside general polygon regions. Should be significantly faster Author: Darren Engwirda polygon, points inside polygon, inpolygon, image processing 97 14
  • 4.3
4.3 | 11 ratings
30 Nov 2006 Screenshot tinterp - an alternative to griddata Linear and quadratic interpolation for scattered data Author: Darren Engwirda interpolation, data sets, linear, scattered interpolati..., quadratic, tinterp 36 3
  • 5.0
5.0 | 3 ratings
15 May 2006 Screenshot Contours for triangular grids Generate smooth contours for functions defined on unstructured triangular grids Author: Darren Engwirda graphics, mesh, unstructured, plotting, specialized, contours 60 6
  • 5.0
5.0 | 9 ratings
03 Apr 2006 Fast sparse matrix vector product sparse matrix vector product Author: Darren Engwirda matrix, linear algebra, sparse, product, vector 21 6
  • 4.0
4.0 | 4 ratings
 

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