apply_by_band

apply_by_band.spectra

<code>apply_by_band</code> is conceptually similar to apply(as.matrix(x), 2, fun),
but returns a spectra object while dealing with metadata and attributes.
Applying a function that does not act on numeric values may crash the function
or render all values NA.

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

apply_by_band function

<dl><dt>x</dt>
<dd>spectra</dd>
<dt>fun</dt>
<dd>numeric function to be applied to each band.</dd>
<dt>na.rm</dt>
<dd>boolean. remove NAs?</dd>
<dt>keep_txt_meta</dt>
<dd>boolean. try to keep text in the metadata?</dd>
<dt>name</dt>
<dd>name for each sample in the output spectra. The default (NULL) will
give samples sequential numeric names. Recycled if necessary.</dd>
<dt>...</dt>
<dd>extra arguments passed to fun</dd></dl>

Arguments

<ul>
<li><code>apply_by_band(spectra)</code>: Apply a numeric function by band</li>
</ul>

Methods (by class)

Author

Apply numeric function by band — apply_by_band

<dl>

<dt>x</dt>
<dd>spectra</dd>


<dt>fun</dt>
<dd>numeric function to be applied to each band.</dd>


<dt>na.rm</dt>
<dd>boolean. remove NAs?</dd>


<dt>keep_txt_meta</dt>
<dd>boolean. try to keep text in the metadata?</dd>


<dt>name</dt>
<dd>name for each sample in the output spectra. The default (NULL) will
give samples sequential numeric names. Recycled if necessary.</dd>


<dt>...</dt>
<dd>extra arguments passed to fun</dd>

</dl>

apply_by_band: Apply numeric function by band

Description

Usage

Value

Arguments

Methods (by class)

Author

Examples