Re: [R] package dependency tree

From: Prof Brian Ripley <>
Date: Tue 02 Jan 2007 - 18:13:13 GMT

On Tue, 2 Jan 2007, roger koenker wrote:

> Is there a painless way to find the names of all packages on CRAN
> that "Depend" on a specified package?

Assuming you have just CRAN in your selected repositories:

> foo <- available.packages()
> deps <- strsplit(foo[, "Depends"], ",[[:space:]]*")
> names(deps)[sapply(deps, function(x) "quantreg" %in% x)]
[1] "cobs" "emplik" "lss" "pheno" "rankreg" "rqmcmb2"

seems painless enough.

Brian D. Ripley,        
Professor of Applied Statistics,
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Received on Wed Jan 03 06:28:42 2007

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