[Rd] Carriage returns and Sweave output

Martin Maechler maechler at stat.math.ethz.ch
Tue Mar 20 08:53:39 CET 2007

>>>>> "Wolfi" == Wolfgang Huber <huber at ebi.ac.uk>
>>>>>     on Mon, 19 Mar 2007 15:38:00 +0000 writes:

    >> the problem with results=hide is that it suppresses everything. I just
    >> need Sweave to suppress strings ending in '\r'...

    Wolfi> Dear Ernest,

    Wolfi> IMHO it is good practice to make the printing of these progress reports 
    Wolfi> ("sweep 4 of 1024\r") optional and produce them only if the user calls 
    Wolfi> your function with, say, "verbose=TRUE", 

I strongly agree.

    Wolfi> and furthermore set the default value of the
    Wolfi> 'verbose' argument to "verbose=interactive()".

or -- typically my choice -- to  'verbose = getOption("verbose")

Martin Maechler, ETH Zurich

    Wolfi> Best wishes
    Wolfi> Wolfgang


    >>> Ernest Turro wrote:
    >>>> Dear all,
    >>>> I have a code chunk in my Rnw file that, when executed, outputs  
    >>>> carriage return characters ('\r') to inform on the progress (e.g.  
    >>>> "sweep 4 of 1024\r"). But Sweave interprets this as a newline  
    >>>> character, and therefore I get countless pages of output in my  
    >>>> vignette where I only really want one line. Any ideas?
    >>>> Thanks
    >>>> E

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