Sampling from large pools — bigsample • ff

bigsample samples quicker from large pools than sample does.

bigsample(x, ...)
# Default S3 method
bigsample(x, size, replace = FALSE, prob = NULL, negative = FALSE, ...)
# S3 method for class 'ff'
bigsample(x, size, replace = FALSE, prob = NULL, ...)

Arguments

x: the pool to sample from
size: the number of elements to sample
replace: TRUE to use sampling with replacement
prob: optional vector of sampling probabilities (recyled to pool length)
negative: negative
...: ...

Details

For small pools sample is called.

Note

Note that bigsample and sample do not necessarily return the same sequence of elements when set.seed is set before.

Value

a vector of elements sampled from the pool (argument 'x')

Author

Daniel Adler, Jens Oehlschlägel, Walter Zucchini

See also

Examples