Re: [R] Using stop ( ) from a Text Editor

From: Prof Brian Ripley <>
Date: Mon, 28 Jul 2008 13:24:47 +0100 (BST)

On Mon, 28 Jul 2008, Paulo Cardoso wrote:

> When using stop clause with a condition, its documented that "If a condition
> object is supplied it should be the only argument, and further arguments
> will be ignored, with a warning".

I see no condition object in your example.

> This will not be the case when running codes from Winedit or TINN?

Please give us some evidence. If you run interactively a single statement comtaining stop(), it stops execution of just that statement.

> When I do something like:
> if(length(content[content%in%folders])!=4) stop("Execution will be
> interrupted")
> from TINN while executing an entire code R will continue reading the code
> anyway.

Just as will pasting multiple lines into an interactive R session -- that is intentional.

I don't know what you mean by 'TINN' and 'Winedit' (what exact program, how are you using them?) but suspect that they are working just like pasting lines into the R session, or R-for-Windows' own pager and script editor.

> Is there a way to interrupt the code of being read from a text interface?

stop() breaks execution of a block of code that source()d -- maybe that is what you are looking for?

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 Mon 28 Jul 2008 - 12:30:22 GMT

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