Partial Differential Equation Toolbox™

pdegrad - Gradient of PDE solution

Syntax

[ux,uy]=pdegrad(p,t,u) 
[ux,uy]=pdegrad(p,t,u,sdl)

[ux,uy]=pdegrad(p,t,u) returns the gradient of u evaluated at the center of each triangle.

Row i from 1 to N of ux contains

Row i from 1 to N of uy contains

There is one column for each triangle in t in both ux and uy.

The geometry of the PDE problem is given by the mesh data p and t. For details on the mesh data representation, see initmesh.

For a description of the format for the solution vector u, see assempde.

The optional argument sdl restricts the computation to the subdomains in the list sdl.