Function to return subsets of
Speclibs by defined conditions.
## S4 method for signature 'Speclib' subset(x, subset, ...)
Object of class 'Speclib'.
Logical expression indicating spectra to keep: missing values are taken as false. Multiple expressions can be applied using logical operators AND and OR. See details section.
Further arguments passed to
Matchable objects are SI data. Use column names to identify the respective SI. See
SI to access SI of a
Speclib. IDs of spectra may be accessed using "id.speclib" as variable name. To subset certain wavelength ranges of a
Speclib refer to
Object of class
Lukas Lehnert, Wolfgang Obermeier
data(spectral_data) ## Return names of SI data names(SI(spectral_data)) ## Divide into both seasons sp_summer <- subset(spectral_data, season == "summer") sp_spring <- subset(spectral_data, season == "spring") ## Divide into both seasons and years sp_summer_14 <- subset(spectral_data, season == "summer" & year == 2014) sp_spring_14 <- subset(spectral_data, season == "spring" & year == 2014) ## Plot all speclibs plot(sp_spring_14, col="green", ylim = c(0,80)) plot(sp_summer_14, col="red", new = FALSE)
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