fm_basis_helpers

fm_basis_mesh_2d

fm_basis_mesh_1d

Methods called internally by <code>fm_basis()</code> methods.

internal

Generate planar and spherical triangle meshes,
compute finite element calculations for 1- and 2-dimensional flat and curved
manifolds with associated basis function spaces, methods for lines and
polygons, and transparent handling of coordinate reference systems and
coordinate transformation, including 'sf' and 'sp' geometries. The core
'fmesher' library code was originally part of the 'INLA' package, and
implements parts of "Triangulations and Applications" by
Hjelle and Daehlen (2006) <doi:10.1007/3-540-33261-8>.

Finn Lindgren

fmesher

Triangle Meshes and Related Geometry Tools

Seaton Andy

Suen Man Ho

Fabian E. Bachl

fm_basis_helpers function

<dl><dt>loc</dt>
<dd>A location/value information object (<code>numeric</code>, <code>matrix</code>, <code>sf</code>,
<code>fm_bary</code>, etc, depending on the class of <code>x</code>)</dd>
<dt>weights</dt>
<dd>Optional weight vector, one weight for each location</dd>
<dt>derivatives</dt>
<dd>logical; If true, also return matrices <code>dA</code> and <code>d2A</code>
for <code>fm_mesh_1d</code> objects, and <code>dx</code>, <code>dy</code>, <code>dz</code> for <code>fm_mesh_2d</code>.</dd>
<dt>...</dt>
<dd>Passed on to submethods</dd>
<dt>method</dt>
<dd>character; either "default", "nearest", "linear", or
"quadratic". With <code>NULL</code> or "default", uses the object definition of the
function space. Otherwise overrides the object definition.</dd></dl>

Arguments

Internal helper functions for mesh field evaluation — fm_basis_helpers

<dl>

<dt>loc</dt>
<dd>A location/value information object (<code>numeric</code>, <code>matrix</code>, <code>sf</code>,
<code>fm_bary</code>, etc, depending on the class of <code>x</code>)</dd>


<dt>weights</dt>
<dd>Optional weight vector, one weight for each location</dd>


<dt>derivatives</dt>
<dd>logical; If true, also return matrices <code>dA</code> and <code>d2A</code>
for <code>fm_mesh_1d</code> objects, and <code>dx</code>, <code>dy</code>, <code>dz</code> for <code>fm_mesh_2d</code>.</dd>


<dt>...</dt>
<dd>Passed on to submethods</dd>


<dt>method</dt>
<dd>character; either "default", "nearest", "linear", or
"quadratic". With <code>NULL</code> or "default", uses the object definition of the
function space. Otherwise overrides the object definition.</dd>

</dl>

fm_basis_helpers: Internal helper functions for mesh field evaluation

Description

Usage

Value

Arguments

Examples