| MATLAB Function Reference | |
Data gridding and hypersurface fitting for 3-D data
Syntax
Description
w = griddata3(x, y, z, v, xi, yi, zi)
fits a hypersurface of the form 
to the data in the (usually) nonuniformly spaced vectors (x, y, z, v). griddata3 interpolates this hypersurface at the points specified by (xi,yi,zi) to produce w. w is the same size as xi, yi, and zi.
(xi,yi,zi) is usually a uniform grid (as produced by meshgrid) and is where griddata3 gets its name.
w = griddata3(...,method)
defines the type of surface that is fit to the data, where method is either:
'linear' |
Tesselation-based linear interpolation (default) |
'nearest' |
Nearest neighbor interpolation |
Algorithm
The griddata3 methods are based on a Delaunay triangulation of the data that uses Qhull [2]. This triangulation uses the Qhull joggle option ('QJ'). For information about Qhull, see http://www.geom.umn.edu/software/qhull/. For copyright information, see http://www.geom.umn.edu/software/download/COPYING.html.
See Also
delaunayn, griddata, griddatan, meshgrid
Reference
[1] Barber, C. B., D.P. Dobkin, and H.T. Huhdanpaa, "The Quickhull Algorithm for Convex Hulls," ACM Transactions on Mathematical Software, Vol. 22, No. 4, Dec. 1996, p. 469-483. Available in HTML format at http://www.acm.org/pubs/citations/journals/toms/1996-22-4/p469-barber/ and in PostScript format at ftp://geom.umn.edu/pub/software/qhull-96.ps.
[2] National Science and Technology Research Center for Computation and Visualization of Geometric Structures (The Geometry Center), University of Minnesota. 1993.
| | griddata | griddatan | |