<code>var</code> computes the variance spectrum. Note that values will not reflect
value anymore, but the variance of the value instead.

Input/Output, processing and visualization of spectra taken with different spectrometers, including SVC (Spectra Vista), ASD and PSR (Spectral Evolution). Implements an S3 class 'spectra' that other packages can build on. Provides methods to access, plot, manipulate, splice sensor overlap, vector normalize and smooth spectra.

Jose Eduardo Meireles

spectrolab

Class and Methods for Spectral Data

Anna K. Schweiger

Jeannine Cavender-Bares

var function

<dl><dt>x</dt>
<dd>a numeric vector, matrix or data frame</dd>
<dt>y</dt>
<dd>NULL (default) or a vector, matrix or data frame with compatible
dimensions to x.</dd>
<dt>na.rm</dt>
<dd>logical. Should missing values be removed?</dd>
<dt>use</dt>
<dd>an optional character string giving a method for computing covariances in
the presence of missing values. This must be (an abbreviation of) one of
the strings "everything", "all.obs", "complete.obs", "na.or.complete",
or "pairwise.complete.obs"</dd></dl>

Arguments

Variance — var

<dl>

<dt>x</dt>
<dd>a numeric vector, matrix or data frame</dd>


<dt>y</dt>
<dd>NULL (default) or a vector, matrix or data frame with compatible
dimensions to x.</dd>


<dt>na.rm</dt>
<dd>logical. Should missing values be removed?</dd>


<dt>use</dt>
<dd>an optional character string giving a method for computing covariances in
the presence of missing values. This must be (an abbreviation of) one of
the strings "everything", "all.obs", "complete.obs", "na.or.complete",
or "pairwise.complete.obs"</dd>

</dl>

var: Variance

Description

Usage

Value

Arguments