mosaic (version 0.8-18)

do: Do Things Repeatedly

Description

do() provides a natural syntax for repetition tuned to assist with replication and resampling methods.

Usage

do(n = 1L, cull = NULL, mode = "default", algorithm = 1,
  parallel = TRUE)
## S3 method for class 'repeater':
print(x, ...)
## S3 method for class 'repeater,ANY':
*(e1, e2)

Arguments

n

number of times to repeat

cull

function for culling output of objects being repeated. If NULL, a default culling function is used. The default culling function is currently aware of objects of types lme, lm, htest, table,

mode

target mode for value returned

algorithm

a number usd to select the algorithm used. Currently numbers below 1 use an older algorithm and numbers >=1 use a newer algorithm which is faster in some situations.

parallel

a logical indicating whether parallel computation should be attempted using the parallel package (if it is installed).

e1

an object (in cases documented here, the result of running do)

e2

an object (in cases documented here, an expression to be repeated)

x

an object used to select a method.

...

further arguments passed to or from other methods.

Value

• do returns an object of class repeater which is only useful in the context of the operator *. See the examples.

See Also

replicate

Examples

do(3) * rnorm(1)
do(3) * "hello"
do(3) * lm(shuffle(height) ~ sex + mother, Galton)
do(3) * anova(lm(shuffle(height) ~ sex + mother, Galton))
do(3) * 1:4
do(3) * mean(rnorm(25))
do(3) * c(sample.mean = mean(rnorm(25)))
do(3) * tally( ~sex|treat, data=resample(HELPrct))