Conversion of a hyperSpec object into a data.frame or matrix as.data.frame returns x@data (as data.frame) as.matrix returns the spectra matrix x@data$spc as matrix

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Description

Conversion of a hyperSpec object into a data.frame or matrix as.data.frame returns x@data (as data.frame) as.matrix returns the spectra matrix x@data$spc as matrix

as.wide.df converts the spectra matrix to a data.frame. The extra data together with this data is returned. The column names of the spectra matrix are retained (if they are numbers, without preceeding letters).

The data.frame returned by as.long.df is guaranteed to have columns spc and .wavelength. If nwl (x) == 0 these columns will be NA.

as.t.df produces a 'transposed' data.frame with columns containing the spectra.

Usage

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## S3 method for class 'hyperSpec'
as.data.frame(x, row.names = TRUE, optional = NULL, ...)

## S3 method for class 'hyperSpec'
as.matrix(x, ...)

as.wide.df(x)

as.long.df(x, rownames = FALSE, wl.factor = FALSE, na.rm = TRUE)

as.t.df(x)

Arguments

x

a hyperSpec object

row.names

if TRUE, a column .row is created containing row names or row indices if no rownames are set. If character vector, the rownames are set accordingly.

optional

ignored

...

ignored

rownames

should the rownames be in column .rownames of the long-format data.frame?

wl.factor

should the wavelengths be returned as a factor (instead of numeric)?

na.rm

if TRUE, rows where spc is not NA are deleted.

Value

x@data and x@data$spc (== x$spc == x [[]]), respectively.

as.wide.df returns a data.frame that consists of the extra data and the spectra matrix converted to a data.frame. The spectra matrix is expanded in place.

as.long.df returns the stacked or molten version of x@data. The wavelengths are in column .wavelength.

as.t.df returns a data.frame similar to as.long.df, but each spectrum in its own column. This is useful for exporting summary spectra, see the example.

Author(s)

C. Beleites

See Also

as.data.frame

and as.matrix

[ for a shortcut to as.matrix

stack and melt or melt for other functions producing long-format data.frames.

Examples

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as.data.frame (chondro [1:3,, 600 ~ 620])
as.matrix (chondro [1:3,, 600 ~ 620])
lm (c ~ spc, data = flu [,,450])

as.wide.df (chondro [1:5,, 600 ~ 610])
summary (as.wide.df (chondro [1:5,, 600 ~ 610]))

as.long.df (flu [,, 405 ~ 410])
summary (as.long.df (flu [,, 405 ~ 410]))
summary (as.long.df (flu [,, 405 ~ 410], rownames = TRUE))
summary (as.long.df (flu [,, 405 ~ 410], wl.factor = TRUE))

df <- as.t.df (apply (chondro, 2, mean_pm_sd))
head (df)

if (require (ggplot2)){
  ggplot (df, aes (x = .wavelength)) +
    geom_ribbon (aes (ymin = mean.minus.sd, ymax = mean.plus.sd),
      fill = "#00000040") +
    geom_line (aes (y = mean))
}

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