[R] Error in writeBin(object, con, size = 2)

[ripley@stats.ox.ac.uk]

I suspect your interpolation produces numeric not integer vectors.  size=2
does not exist for numeric (aka double) vectors.

I really don't understand why this was not obvious!  How did you expect
numeric data to be output in two bytes?

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)
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