TRIGRADIENT.M by Mick Warehime

Fast approximation to the gradient for scattered data and for data defined by a triangulation. (triangulation, gradient, delaunay)

trigradient(x,y,z,t,opt)

Color coded 3D scatterplot by Ken Garrard

Produces a 3D scatterplot of XYZ data with varying colors (scatterplot, 3d, specialized)

plot3k(L,varargin)

Contours for triangular grids by Darren Engwirda

Generate smooth contours for functions defined on unstructured triangular grids (contours, specialized, unstructured)

contourdemo

tricontour(p,t,Hn,N)

Making Surface Plots From Scatter Data by Zain Mecklai

How to turn a collection of XYZ triplets into a surface plot. (article, surface, paper)

surf_from_scatter.m