[R] What exactly does rchkusr() do?

[Prof Brian Ripley]

rchkusr is documented in 'Writing R Extensions', as an entry point in R.
Please read there exactly what it does.

On Fri, 22 Feb 2008, Guilherme Veiga da Rocha wrote:

> 	Hi all,
>
> 	I am trying to compile a fortran routine originally written for R
> from within matlab.
>
> 	It all worked fine, but the newest version of the Fortran code has a
> call to rchkusr() and I now get a message that this is an undefined
> symbol.
>
> 	I am under the impression that rchkusr() just serves to let the
> processor take care of interruption messages (typically, the user
> frantically pressing Ctrl-C to stop running).
> 	a) Is that right?
>
> 	Another two questions are:
> 	1 - If I choose to keep this "interruption checkpoint" in the
> routine, what library is  rchkusr() in and how do I link it when
> compiling the Fortran object?
> 	2 - True of False: If I choose to comment that line, that just means
> that the user will not be able to stop running the calculations while
> the processor executes the Fortran bit of the code.
>
> 	Answers to any of the a, 1, 2 questions above is welcome.
>
> 	And in case you are wondering:
> 	- I am trying to link the Fortran to matlab so I can compare results
> to other similar routines coded in matlab;
> 	- This is in the glasso package by Friedman, Hastie, Tibshirani.
>
> 	Thanks for any help.
>
> 	Cheers,
>
> 	Guilherme Rocha
>
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>

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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