mutate: Mutate a Spectra* object by transforming the spectra values,...

Description Usage Arguments Author(s) References Examples

Description

This function is very similar to transform but it executes the transformations iteratively so that later transformations can use the columns created by earlier transformations. Like transform, unnamed components are silently dropped.

Either the spectra, and/or the attributes (if the .data inherits from the SpectraDataFrame class) can be affected:

Usage

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## S4 method for signature 'Spectra'
mutate(.data, ...)

Arguments

.data

an object inheriting from the Spectra class

...

named parameters giving definitions of new columns

Author(s)

Pierre Roudier pierre.roudier@gmail.com, from code from Hadley Wickham

References

Hadley Wickham (2011). The Split-Apply-Combine Strategy for Data Analysis. Journal of Statistical Software, 40(1), 1-29. URL http://www.jstatsoft.org/v40/i01/.

Examples

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# Loading example data
data(australia)
spectra(australia) <- sr_no ~ ... ~ 350:2500

# Modifying spectra
m <- mutate(australia, nir = log1p(1/nir))
plot(m)

# Modifying and creating attributes
m <- mutate(
  australia, 
  sqrt_carbon = sqrt(carbon), 
  foo = clay + ph, 
  nir = log1p(1/nir)
)
plot(m)

spectacles documentation built on Jan. 13, 2021, 8:46 a.m.