Search Peaks

Search the maxima in sequential data around a given value.

Usage

peaks_search(object, index, ...)

# S4 method for class 'GammaSpectrum,integer'
peaks_search(object, index, span = 10, tolerance = 0.025)

# S4 method for class 'GammaSpectrum,numeric'
peaks_search(object, index, span = 10, tolerance = 0.025)

Arguments

object

A GammaSpectrum object.

index

A vector giving the expected peak position. If index is a numeric vector, peaks are searched by energy (index is assumed to be expressed in keV). If index is an integer vector, peaks are searched by channel.

...

Currently not used.

span

A numeric value giving the half window size for searching. If index is a numeric vector, span is expressed in keV. If index is an integer vector, span is expressed in channel.

tolerance

A numeric value giving the threshold above which a warning/error is raised.

Value

A PeakPosition object.

See also

Other signal processing: baseline, peaks_find(), signal_integrate(), signal_slice(), signal_split(), signal_stabilize(), smooth()

Author

N. Frerebeau

Examples

## Import a LaBr spectrum
LaBr_file <- system.file("extdata/LaBr.TKA", package = "gamma")
LaBr_spc <- read(LaBr_file)

## Find peaks by channel
(LaBr_pks <- peaks_find(LaBr_spc)) # Ugly
#> 2 peaks were detected.
plot(LaBr_spc, LaBr_pks)


## Search peaks by channel
(LaBr_pks <- peaks_search(LaBr_spc, index = c(86L, 207L, 496L), span = 7))
#> 3 peaks were detected.
plot(LaBr_spc, LaBr_pks, split = TRUE)


## Import a BEGe spectrum
BEGe_file <- system.file("extdata/BEGe.CNF", package = "gamma")
BEGe_spc <- read(BEGe_file)

## Search peaks by energy
(BEGe_pks <- peaks_search(BEGe_spc, index = c(47, 63, 911, 1460)))
#> 4 peaks were detected.
plot(BEGe_spc, BEGe_pks, split = TRUE)