Utilities for composing URL's

Two helpful utilities for assembling URL's.

Usage

composeURL(..., prefix="http://")
indexGrep(pattern, x, ...)

Arguments

...

for composeURL, character strings from which the URL will be composed; for indexGrep, optional arguments to be passed to the function grep.

prefix

a character string specifying the prefix of the URL.

pattern

a character string containing a regular expression to be matched in the given character vector.

x

a character vector where matches are sought.

References

Diethelm Wuertz, Yohan Chalabi, and Andrew Ellis, (2010); Financial Market Data for R/Rmetrics, Rmetrics eBook, Rmetrics Association and Finance Online, Zurich, www.rmetrics.org.