[R] Error in writeBin(object, con, size = 2)
Sven Garbade
garbade at psy.uni-muenchen.de
Mon Oct 7 20:43:34 CEST 2002
ripley at stats.ox.ac.uk writes:
> I suspect your interpolation produces numeric not integer vectors. size=2
> does not exist for numeric (aka double) vectors.
Yes, that was it.
>
> I really don't understand why this was not obvious! How did you expect
> numeric data to be output in two bytes?
The unexpected thing was that the data was sometimes numeric and
sometimes integer. I need the output in two bytes because of some old
DOS programms some of us still use.
Bye, Sven
>
> On Mon, 7 Oct 2002, Sven Garbade wrote:
>
> > Hi all,
> >
> > I wrote a function (in R batch mode) which reads binary data,
> > interpolates sometimes and wrote a new binary file of the same size as
> > the input file. Her is a bit of code:
> >
> > while (length( head <- readBin(si, integer(), 64, size=2))) {
> > data <- readBin(si, integer(), head[5], size=2)
> > ## now write head to new file
> > writeBin(head, so, size=2)
> > ## if head[4] is 9 or 10, interpolate
> > if(head[4] == 9 | head[4] == 10)
> > ## interpolate data
> > data <-int(data)
> > writeBin(data, so, size=2)
> > }
> >
> > si and so are the binary in- and output connections, "int()"
> > interpolates between some data segments and returns a numeric vector
> > of the same length as the input vector.
> >
> > However, if the data were interpolated, the execution stops with the
> > follwing error:
> >
> > Error in writeBin(data, so, size = 2) : That size is unknown on this machine
> > Execution halted
> >
> > This error only occured, if "int()" was called before
> > writeBin(). int() returns a numeric vector with integers.
> >
> > With writeBin(data, so) everything works, but this gives the wrong
> > bytes per element in the byte stream.
> >
> > Any suggestions?
> > Thanks, Sven
> >
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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)
> 1 South Parks Road, +44 1865 272860 (secr)
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