spectra: Spectra object constructor

In spectrolab: Class and Methods for Spectral Data

Spectra object constructor

Description

spectra "manually" creates a spectra object

Usage

spectra(value, bands, names, meta = NULL, ...)

Arguments

value	N by M numeric matrix. N samples in rows and M bands in columns
bands	band names in vector of length M
names	sample names in vector of length N
meta	spectra metadata. defaults to NULL. Must be either of length or nrow equals to the number of samples (nrow(value) or length(names))
...	additional arguments to metadata creation. not implemented yet

Value

spectra object

Note

This function resorts to an ugly hack to deal with metadata assignment. Need to think a little harder to find a solution.

Author(s)

Jose Eduardo Meireles

Examples

library(spectrolab)
# 1. Create a value matrix.
#    In this case, by removing the first column that holds the species name
rf = spec_matrix_example[ , -1]

# (2) Create a vector with band labels that match
#     the value matrix columns.
wl = colnames(rf)

# (3) Create a vector with sample labels that match
#     the value matrix rows.
#     In this case, use the first colum of spec_matrix_example
sn = spec_matrix_example[ , 1]

# Finally, construct the spectra object using the `spectra` constructor
spec = spectra(value = rf, bands = wl, names = sn)

spectrolab documentation built on Feb. 16, 2023, 10:27 p.m.