fm_crs_is_null

is.na.fm_crs

Methods of checking whether various kinds of CRS objects are <code>NULL</code> or <code>NA</code>.
Logically equivalent to either <code>is.na(fm_crs(x))</code> or
<code>is.na(fm_crs(x, oblique = NA))</code>, but with a short-cut pre-check for
<code>is.null(x)</code>.

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_crs_is_null function

<dl><dt>x</dt>
<dd>An object supported by <code>fm_crs(x)</code></dd>
<dt>crsonly</dt>
<dd>For crs objects with extended functionality, such as
<code>fm_crs()</code> objects with <code>oblique</code> information, <code>crsonly = TRUE</code> only checks
the plain CRS part.</dd></dl>

Arguments

<ul>
<li><code>fm_crs_is_null()</code>: Check if an object is or has <code>NULL</code> or <code>NA</code> CRS
information. If not <code>NULL</code>, <code>is.na(fm_crs(x))</code> is returned. This allows the
input to be e.g. a proj4string or epsg number, since the default <code>fm_crs()</code>
method passes its argument on to <code><a href="https://r-spatial.github.io/sf/reference/st_crs.html">sf::st_crs()</a></code>.</li>
<li><code>is.na(fm_crs)</code>: Check if a <code>fm_crs</code> has <code>NA</code> crs information and
<code>NA</code> obliqueness</li>
</ul>

Functions

Check if a crs is NULL or NA — fm_crs_is_null

<dl>

<dt>x</dt>
<dd>An object supported by <code>fm_crs(x)</code></dd>


<dt>crsonly</dt>
<dd>For crs objects with extended functionality, such as
<code>fm_crs()</code> objects with <code>oblique</code> information, <code>crsonly = TRUE</code> only checks
the plain CRS part.</dd>

</dl>

<ul>
<li><code>fm_crs_is_null()</code>: Check if an object is or has <code>NULL</code> or <code>NA</code> CRS
information. If not <code>NULL</code>, <code>is.na(fm_crs(x))</code> is returned. This allows the
input to be e.g. a proj4string or epsg number, since the default <code>fm_crs()</code>
method passes its argument on to <code><a href='https://r-spatial.github.io/sf/reference/st_crs.html'>sf::st_crs()</a></code>.</li>
<li><code>is.na(fm_crs)</code>: Check if a <code>fm_crs</code> has <code>NA</code> crs information and
<code>NA</code> obliqueness</li>
</ul>

fm_crs_is_null: Check if a crs is NULL or NA

Description

Usage

Value

Arguments

Functions

See Also

Examples