Re: [Rd] Packages that require other packages - How?

From: Duncan Murdoch <>
Date: Wed 09 Nov 2005 - 17:22:58 GMT

On 11/9/2005 11:50 AM, Gavin Simpson wrote:
> Dear list,
> The help page for library/require contains the following paragraph in
> the section "Packages that require other packages":
> The source code for a package that requires one or more other
> packages should have a call to 'require', preferably near the
> beginning of the source, and of course before any code that uses
> functions, classes or methods from the other package.
> Now, I'm being very dense today, but I don't know where to put such a
> call to require.
> My package has added methods for a generic function supplied by another
> package. I have listed this package in the Depends field in my
> What do I need to do to have the package that my package depends on be
> attached when I call library or require to attach my package?
> Apologies for being dense...

You can either put a call to require() in the function that needs it (which would be the best solution if that function is relatively rarely used), or in the startup code (in .First.lib, .onLoad, or .onAttach: see the manual for the differences) if you make extensive use of the other package.

Duncan Murdoch mailing list Received on Thu Nov 10 05:12:19 2005

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