c_spec: Manage spectral objects

Description

c_spec() concatenates OpenSpecy objects. sample_spec() samples spectra from an OpenSpecy object. merge_map() merge two OpenSpecy objects from spectral maps.

Usage

c_spec(x, ...)
# S3 method for default
c_spec(x, ...)
# S3 method for OpenSpecy
c_spec(x, ...)
# S3 method for list
c_spec(x, range = NULL, res = 5, ...)
sample_spec(x, ...)
# S3 method for default
sample_spec(x, ...)
# S3 method for OpenSpecy
sample_spec(x, size = 1, prob = NULL, ...)
merge_map(x, ...)
# S3 method for default
merge_map(x, ...)
# S3 method for OpenSpecy
merge_map(x, ...)
# S3 method for list
merge_map(x, origins = NULL, ...)

Value

c_spec() and sample_spec() return OpenSpecy objects.

Arguments

x: a list of OpenSpecy objects or of file paths.
range: a numeric providing your own wavenumber ranges or character argument called "common" to let c_spec() find the common wavenumber range of the supplied spectra. NULL will interpret the spectra having all the same wavenumber range.
res: defaults to NULL, the resolution you want the output wavenumbers to be.
size: the number of spectra to sample.
prob: probabilities to use for the sampling.
origins: a list with 2 value vectors of x y coordinates for the offsets of each image.
...: further arguments passed to submethods.

Author

Zacharias Steinmetz, Win Cowger

Examples

Run this code

# Concatenating spectra
spectra <- lapply(c(read_extdata("raman_hdpe.csv"),
                    read_extdata("ftir_ldpe_soil.asp")), read_any)
common <- c_spec(spectra, range = "common", res = 5)
range <- c_spec(spectra, range = c(1000, 2000), res = 5)

# Sampling spectra
tiny_map <- read_any(read_extdata("CA_tiny_map.zip"))
sampled <- sample_spec(tiny_map, size = 3)