plyr (version 1.8.4)

rdply: Replicate expression and return results in a data frame.

Description

Evaluate expression n times then combine results into a data frame

Usage

rdply(.n, .expr, .progress = "none", .id = NA)

Arguments

.n

number of times to evaluate the expression

.expr

expression to evaluate

.progress

name of the progress bar to use, see create_progress_bar

.id

name of the index column. Pass NULL to avoid creation of the index column. For compatibility, omit this argument or pass NA to use ".n" as column name.

Value

a data frame

Details

This function runs an expression multiple times, and combines the result into a data frame. If there are no results, then this function returns a data frame with zero rows and columns (data.frame()). This function is equivalent to replicate, but will always return results as a data frame.

References

Hadley Wickham (2011). The Split-Apply-Combine Strategy for Data Analysis. Journal of Statistical Software, 40(1), 1-29. http://www.jstatsoft.org/v40/i01/.

Examples

# NOT RUN {
rdply(20, mean(runif(100)))
rdply(20, each(mean, var)(runif(100)))
rdply(20, data.frame(x = runif(2)))
# }