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Darren Engwirda


26 total contributions since 2006

Associate research scientist at CU / NASA-GISS working on unstructured meshing algorithms and unstructured finite-volume/difference methods for ocean modelling.

https://github.com/dengwirda

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Contributions in
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Submitted


JIGSAW(GEO): Grid-generation for geophysical modelling
JIGSAW(GEO) is an unstructured grid-generator for geophysical modelling.

7 days ago | 8 downloads |

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Submitted


MESH2D - Delaunay-based unstructured mesh-generation
MESH2D is a Delaunay-based mesh-generator for two-dimensional geometries.

1 month ago | 142 downloads |

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Submitted


AABBTREE - A d-dimensional bounding-box tree.
A d-dimensional bounding-box tree for collections of objects.

1 month ago | 6 downloads |

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Submitted


FINDTRIA - Point-in-Simplex queries in d-dimensions.
Spatial queries for collections of triangles, tetrahedrons and general d-simplexes.

1 month ago | 4 downloads |

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Question


Redirecting stdout via system(…,'-echo')
I often call computationally intensive command-line programs from within MATLAB using the system command: [status, result] ...

11 months ago | 1 answer | 0

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answer

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JIGSAW: An unstructured mesh generator
JIGSAW is a Delaunay-based unstructured mesh generator for two- and three-dimensional geometries.

1 year ago | 19 downloads |

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Submitted


DUALMESH - Polygonal mesh construction.
Construct polygonal "dual" meshes from 2-simplex triangulations embedded in R^3.

2 years ago | 16 downloads |

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Responded


Re: mesh on a triangle
There are probably heaps of ways to get MATLAB to do this, one way is to construct a mesh of the triangular domain. You could us...

9 years ago | 5593 views

Responded


Re: contour line triangulation
Have you tried the mesh2d routines on the FEX? You should be able to triangulate the polygons defined by the contour lines... D...

9 years ago | 7181 views

Responded


Re: Mesh2D V23
Ok, so you want the whole circle, but split into 2 faces: r1 = 1.5; r2 = 3.2; n = 16; dA = 2.0*pi/n; A = (-pi:dA:(pi-dA))'; ...

9 years ago | 4244 views

Responded


Re: Mesh2D V23
Rui, Is this what you want? r1 = 1.5; r2 = 3.2; n = 16; dA = 2.0*pi/n; A = (-pi:dA:(pi-dA))'; n1 = [r1*cos(A), r1*sin(A)]; ...

9 years ago | 4244 views

Responded


Re: Mesh2D V23
Rui Silva" <el_tuka@iol.pt> wrote in message a "connectivity" need the if Hi Rui, As you have noted the general call to mesh2...

9 years ago | 4244 views

Responded


Re: finite difference
Rui Silva" <el_tuka@iol.pt> wrote in message <g40g6d$558 $1@fred.mathworks.com>... usually problem: x first mesh want mesh. help...

9 years ago | 3784 views

Responded


Re: Boundary Conditions
Rui Silva" <el_tuka@iol.pt> wrote in message what using and it This is a bit confusing. Mesh2d and distmesh2d both produce un...

9 years ago | 2936 views

Responded


Re: non-uniform mesh
Ozhan <aeroosso@hotmail.com> wrote in message perfect) 2D mesh in Matlab? Suppose we have a curve, which the formula of the equa...

9 years ago | 2771 views

Responded


Re: Speeding up GRIDDATA
Volker K" <klinkv.NOSPAM@yahoo.de> wrote in message Just out of interest, there's a function "tinterp" on the file exchange th...

9 years ago | 6406 views

Responded


Re: computational requirements for Delaunay
Steve <srjm72499@gmail.com> wrote in message seem to be bewteen O(n^1.5) Matlab (Qhull) is other than a Qhull should be using t...

10 years ago | 1480 views

Responded


Re: Modifying MEX arguments in place?
What about an iterative solver then, like something from the preconditioned conjugate gradient family. You only need to store th...

10 years ago | 11576 views

Responded


Re: PDETOOL
jonathan.ethier@gmail.com wrote in message various squares, export the workspace all manually do sizes (for using other let me ...

10 years ago | 1916 views

Submitted


Fast points-in-polygon test
Fast test to determine points located inside general polygon regions. Should be significantly faster

10 years ago | 48 downloads |

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Responded


Re: about the convergence of conjugate gradient
yunzhi cheng" <sjtu_yh@yahoo.com> wrote in message The jacobi preconditioner will only contribute when the diagonal terms are n...

10 years ago | 17823 views

Responded


Re: about the convergence of conjugate gradient
yunzhi cheng" <sjtu_yh@yahoo.com> wrote in message CG methods will theoretically converge in a maximum of N iterations for an N...

10 years ago | 17823 views

Submitted


tinterp - an alternative to griddata
Linear and quadratic interpolation for scattered data

11 years ago | 15 downloads |

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Submitted


Contours for triangular grids
Generate smooth contours for functions defined on unstructured triangular grids

11 years ago | 33 downloads |

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