Take a sample of the specified size from the elements of x with or without replacement.
# S4 method for hyperSpec sample(x, size, replace = FALSE, prob = NULL) isample(x, size = nrow(x), replace = FALSE, prob = NULL) # S4 method for data.frame sample(x, size, replace = FALSE, prob = NULL, drop = FALSE) # S4 method for matrix sample(x, size, replace = FALSE, prob = NULL, drop = FALSE)
x | The hyperSpec object, data.frame or matrix to sample fromto sample from |
---|---|
size | positive integer giving the number of spectra (rows) to choose. |
replace | Should sampling be with replacement? |
prob | A vector of probability weights for obtaining the elements of the vector being sampled. |
drop | see |
a hyperSpec object, data.frame or matrix with size
rows for
sample
, and an integer vector for isample
that is suitable for
indexing (into the spectra) of x.
vector with indices suitable for row-indexing x
C. Beleites
#> hyperSpec object #> 3 spectra #> 3 data columns #> 181 data points / spectrumisample(flu, 3)#> [1] 2 4 1isample(flu, 3, replace = TRUE)#> [1] 1 5 1isample(flu, 8, replace = TRUE)#> [1] 5 3 5 4 5 1 5 6#> speed dist #> 24 15 20 #> 46 24 70#> [,1] [,2] [,3] [,4] #> [1,] 4 10 16 22 #> [2,] 3 9 15 21