| Partial Differential Equations Toolbox | |
Indices of points in canonical ordering for rectangular grid.
[n1,n2,h1,h2,i,c,ii,cc]=poiindex(p,e,t,sd)
Description
[n1,n2,h1,h2,i,c,ii,cc]=poiindex(p,e,t,sd)
identifies a given grid p, e, t in the subdomain sd as an evenly spaced rectangular grid. If the grid is not rectangular, n1 is 0 on return. Otherwise n1 and n2 are the number of points in the first and second directions, h1 and h2 are the spacings. i and ii are of length (n1-2)*(n2-2) and contain indices of interior points. i contains indices of the original mesh, whereas ii contains indices of the canonical ordering. c and cc are of length n1*n2-(n1-2)*(n2-2) and contain indices of border points. ii and cc are increasing.
n1=3 and n2=5, then ii=[5 8 11] and cc=[1 2 3 4 6 7 9 10 12 13 14 15].
| poicalc | poimesh | |