[R] Single Precision (4 byte) floats with readBin

[Peter Lauren]

--- Sundar Dorai-Raj <sundar.dorai-raj at pdf.com> wrote:

> 
> 
> Peter Lauren said the following on 9/27/2006 3:11
> PM:
> > I would like to use readBin to read a binary data
> > file.  Most of the data is 4-byte floating point
> but,
> > for some reason, only double precision appears to
> be
> > offered.  I tried 
> > fVariable=readBin(iFile,what=single());
> > and got 35.87879 which looks believable except
> that
> > the correct value is 3.030303.  I then tried
> > fVariable=readBin(iFile,what=single(),4);
> > and got 
> > [1]  3.831111e+10  6.657199e+10 -5.592394e+29
> > -5.592397e+29
> > 
> > For the second call, there were two more single
> > precision floats of value 3.030303 followed by two
> > more with values 40.46 and 0.00 respectively.
> > 
> > Is there any way around this problem other than to
> > make the input data double (which I definitely do
> not
> > want to do)? 
> > 
> > Many thanks in advance,
> > Peter.
> > 
> > ______________________________________________
> > R-help at stat.math.ethz.ch mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained,
> reproducible code.
> 
> 
> Hi, Peter,
> 
> I believe you can use
> 
> readBin(file, double(), size = 4)
> 

It worked!  Thanks very much.

Peter.