Random Samples and Permutations Take a sample of the specified size from the elements of x with or without replacement.
Random Samples and Permutations Take a sample of the specified size from the elements of x with or without replacement.
isample returns an vector of indices, sample returns the
corresponding hyperSpec object.
## S4 method for signature 'hyperSpec' sample(x, size, replace = FALSE, prob = NULL) isample(x, size = nrow(x), replace = FALSE, prob = NULL) ## S4 method for signature 'data.frame' sample(x, size, replace = FALSE, prob = NULL, drop = FALSE) ## S4 method for signature '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
sample (flu, 3)
plot (flu, col = "darkgray")
plot (sample (flu, 3), col = "red", add = TRUE)
plot (flu, col = "darkgray")
plot (sample (flu, 3, replace = TRUE), col = "#0000FF80", add = TRUE,
lines.args = list (lwd = 2));
isample (flu, 3)
isample (flu, 3, replace = TRUE)
isample (flu, 8, replace = TRUE)
sample (cars, 2)
sample (matrix (1:24, 6), 2)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.