triangles: Extract a list of triangles from a triangulation object
In interp: Interpolation Methods
triangles R Documentation
Extract a list of triangles from a triangulation object
Description
This function extracts a list of triangles
from an triangulation object created by tri.mesh.
Usage
triangles(tri.obj)
Arguments
tri.obj
object of class triSht
Details
The vertices in the returned matrix (let's denote it with
retval) are ordered counterclockwise. The columns trx
and arcx, x=1,2,3 index the triangle and arc, respectively,
which are opposite (not shared by) node nodex, with
trix=0 if arcx indexes a boundary arc. Vertex indexes
range from 1 to n, the number of nodes, triangle indexes from 0
to nt, and arc indexes from 1 to na = nt+n-1.
Value
A matrix with columns node1, node2, node3,
representing the vertex nodal indexes,
tr1, tr2, tr3, representing neighboring triangle
indexes and arc1, arc2, arc3 reresenting arc
indexes.
Each row represents one triangle.
Author(s)
Albrecht Gebhardt <albrecht.gebhardt@aau.at>,
Roger Bivand <roger.bivand@nhh.no>
See Also
triSht, print.triSht,
plot.triSht, summary.triSht,
triangles
Examples
# use the smallest Franke data set
data(franke)
fr3.tr<-tri.mesh(franke$ds3$x, franke$ds3$y)
triangles(fr3.tr)
interp documentation built on May 29, 2024, 8:03 a.m.
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| triangles | R Documentation |
Extract a list of triangles from a triangulation object
Description
This function extracts a list of triangles
from an triangulation object created by tri.mesh.
Usage
triangles(tri.obj)
Arguments
tri.obj |
object of class |
Details
The vertices in the returned matrix (let's denote it with
retval) are ordered counterclockwise. The columns trx
and arcx, x=1,2,3 index the triangle and arc, respectively,
which are opposite (not shared by) node nodex, with
trix=0 if arcx indexes a boundary arc. Vertex indexes
range from 1 to n, the number of nodes, triangle indexes from 0
to nt, and arc indexes from 1 to na = nt+n-1.
Value
A matrix with columns node1, node2, node3,
representing the vertex nodal indexes,
tr1, tr2, tr3, representing neighboring triangle
indexes and arc1, arc2, arc3 reresenting arc
indexes.
Each row represents one triangle.
Author(s)
Albrecht Gebhardt <albrecht.gebhardt@aau.at>, Roger Bivand <roger.bivand@nhh.no>
See Also
triSht, print.triSht,
plot.triSht, summary.triSht,
triangles
Examples
# use the smallest Franke data set
data(franke)
fr3.tr<-tri.mesh(franke$ds3$x, franke$ds3$y)
triangles(fr3.tr)
R Package Documentation
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Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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