prospectr: binning – R documentation

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binning

Signal binning

Description

Compute average values of a signal in pre-determined bins (col-wise subsets). The bin size can be determined either directly or by specifying the number of bins. Sometimes called boxcar transformation in signal processing

Usage

binning(X, bins, bin.size)

Arguments

`X`	a numeric matrix or vector to process (optionally a data frame that can be coerced to a numerical matrix).
`bins`	the number of bins.
`bin.size`	the desired size of the bins.

Value

a matrix or vector with average values per bin.

Author(s)

Antoine Stevens & Leonardo Ramirez-Lopez

Examples

data(NIRsoil)
wav <- as.numeric(colnames(NIRsoil$spc))

# 5 first spectra
matplot(wav, t(NIRsoil$spc[1:5, ]),
  type = "l",
  xlab = "Wavelength /nm",
  ylab = "Absorbance"
)

NIRsoil$spc_binned <- binning(NIRsoil$spc, bin.size = 20)

# bin means
matpoints(as.numeric(colnames(NIRsoil$spc_binned)),
  t(NIRsoil$spc_binned[1:5, ]),
  pch = 1:5
)

NIRsoil$spc_binned <- binning(NIRsoil$spc, bins = 20)
dim(NIRsoil$spc_binned) # 20 bins

# 5 first spectra
matplot(wav,
  t(NIRsoil$spc[1:5, ]),
  type = "l",
  xlab = "Wavelength /nm",
  ylab = "Absorbance"
)

# bin means
matpoints(as.numeric(colnames(NIRsoil$spc_binned)),
  t(NIRsoil$spc_binned[1:5, ]),
  pch = 1:5
)

prospectr

Miscellaneous Functions for Processing and Sample Selection of Spectroscopic Data

v0.2.1

MIT + file LICENSE

Authors

Antoine Stevens [aut, cre] (<https://orcid.org/0000-0002-1588-7519>), Leonardo Ramirez-Lopez [aut, cre] (<https://orcid.org/0000-0002-5369-5120>), Guillaume Hans [ctb] (<https://orcid.org/0000-0002-6503-5760>)

Initial release

2020-10-23