Uses the results from `aovPCAscores`

to plot the corresponding
loadings.

`aovPCAloadings(spectra, PCA, submat = 1, loads = 1, ref = 1, ...)`

- spectra
An object of S3 class

`Spectra`

.- PCA
List of pca results created by

`aov_pcaSpectra`

.- submat
Integer. Selects list element

`submat`

from`PCA`

which is a list of PCA results, each corresponding to the computation in`aov_pcaSpectra`

.- loads
An integer vector giving the loadings to plot.

- ref
An integer specifying the reference spectrum to plot, which appears at the bottom of the plot.

- ...
Parameters to be passed to the plotting routines.

*Applies to base graphics only*.

The returned value depends on the graphics option selected (see `GraphicsOptions`

).

- base:
None. Side effect is a plot.

- ggplot2:
The plot is displayed, and a

`ggplot2`

plot object is returned if the value is assigned. The plot can be modified in the usual`ggplot2`

manner.

Pinto, Bosc, Nocairi, Barros, and Rutledge. "Using ANOVA-PCA for Discriminant Analysis: ..." Analytica Chimica Acta 629.1-2 (2008): 47-55.

Harrington, Vieira, Espinoza, Nien, Romero, and Yergey. "Analysis of Variance--Principal Component Analysis: ..." Analytica Chimica Acta 544.1-2 (2005): 118-27.

An example using this function can be seen in
`aov_pcaSpectra`

. See also `plotLoadings`

.
Additional documentation at https://bryanhanson.github.io/ChemoSpec/