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Manage spectral objects

Source: R/manage_spec.R
manage_spec.Rd

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, ...)

# Default S3 method
c_spec(x, ...)

# S3 method for class 'OpenSpecy'
c_spec(x, ...)

# S3 method for class 'list'
c_spec(x, range = "full", res = 6, ...)

sample_spec(x, ...)

# Default S3 method
sample_spec(x, ...)

# S3 method for class 'OpenSpecy'
sample_spec(x, size = 1, prob = NULL, ...)

merge_map(x, ...)

# Default S3 method
merge_map(x, ...)

# S3 method for class 'OpenSpecy'
merge_map(x, ...)

# S3 method for class 'list'
merge_map(x, origins = NULL, ...)

Arguments

x

a list of OpenSpecy objects or of file paths.

range

a numeric providing your own wavenumber range, "full" to use the widest range represented by any supplied spectrum, or "common" to use only their overlapping range. NULL requires identical wavenumbers. The default is "full".

res

resolution of the output wavenumbers. The default of 6 is intended for reference-library identification workflows.

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.

Value

c_spec() and sample_spec() return OpenSpecy objects.

See also

conform_spec() for conforming wavenumbers

Author

Zacharias Steinmetz, Win Cowger

Examples

# Concatenating spectra
spectra <- lapply(c(read_extdata("raman_hdpe.csv"),
                    read_extdata("ftir_ldpe_soil.asp")), read_any)
full <- c_spec(spectra)
common <- c_spec(spectra, range = "common", res = 6)
range <- c_spec(spectra, range = c(1000, 2000), res = 6)

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