merge: Merge hyperSpec objects

In hyperSpec: Work with Hyperspectral Data, i.e. Spectra + Meta Information (Spatial, Time, Concentration, ...)

Merge hyperSpec objects

Description

Merges two hyperSpec objects and cbinds their spectra matrices, or merges additional extra data into a hyperSpec object.

Usage

## S4 method for signature 'hyperSpec,hyperSpec'
merge(x, y, ...)

## S4 method for signature 'hyperSpec,data.frame'
merge(x, y, ...)

## S4 method for signature 'data.frame,hyperSpec'
merge(x, y, ...)

Arguments

x	a hyperSpec object or data.frame
y	a hyperSpec object or data.frame (including derived classes like tibble)
...	handed to merge.data.frame

Details

After merging, the spectra matrix can contain duplicates, and is not ordered according to the wavelength.

If the wavelength axis should be ordered, use orderwl.

If a hyperSpec object and a data.frame are merged, the result is of the class of the first (x) object.

Author(s)

C. Beleites

See Also

merge.

collapse combines hyperSpec objects that do not share the wavelength axis. rbind, and cbind for combining hyperSpec objects that.

Examples

merge (chondro [1:10,, 600], chondro [5:15,, 600], by = c("x", "y"))$.
tmp <- merge (chondro [1:10,, 610], chondro [5:15,, 610],
              by = c("x", "y"), all = TRUE)
tmp$.
wl (tmp)

## remove duplicated wavelengths:
approxfun <- function (y, wl, new.wl){
  approx (wl, y, new.wl, method = "constant",
          ties = function (x) mean (x, na.rm = TRUE)
          )$y
}

merged <- merge (chondro [1:7,, 610 ~ 620], chondro [5:10,, 615 ~ 625], all = TRUE)
merged$.
merged <- apply (merged, 1, approxfun,
                 wl = wl (merged), new.wl = unique (wl (merged)),
                 new.wavelength = "new.wl")
merged$.

## merging data.frame into hyperSpec object => hyperSpec object
y <- data.frame (filename = sample (flu$filename, 4, replace = TRUE), cpred = 1:4)
y
tmp <- merge (flu, y)
tmp$..

## merging hyperSpec object into data.frame => data.frame
merge (y, flu)

hyperSpec documentation built on Nov. 5, 2025, 6:32 p.m.