[R] Reading Binary Files
hb at stat.berkeley.edu
Wed Feb 11 18:20:12 CET 2009
Argument 'size' is what you are looking for, cf. help(readBin).
Whenever reading binary files this way, I strongly recommend that you
are explicit about all arguments of readBin(), e.g.
readBin(con, what=integer(), size=2, signed=TRUE, endian="little", n=n);
For instance, you probably do not want 'endian' to be dependent on the
platform (see help) you run on, but instead be specific to the file
format you are reading.
On Wed, Feb 11, 2009 at 8:04 AM, <Steve_Friedman at nps.gov> wrote:
> I'm encountering some difficulty correctly reading binary files. The binary
> files store data as "short" rather than "double" , "int", or any of the
> other modes of the vector being read.
> The data represents a regular grid of size 419 rows by 264 columns, to make
> it more interesting, the data are daily records, for a total of 37 years.
> The file size is therefore 419(rows) * 264(columns) * 365(days) * 37(years)
> The product of these dimensions is 1493869080 records.
> I'm using the following code to read these into R (windows 2.8.1 )
> con <- file(file.choose(), open="rb")
> Year66 <- readBin(con, integer, signed=TRUE, n = 40374840)
> returns 2046396
> I'm betting that I'm defining the "what" incorrectly, but after numerous
> attempts with different choices I'm wondering if readBin can handle "short"
> Any help is greatly appreciated.
> Steve Friedman Ph. D.
> Spatial Statistical Analyst
> Everglades and Dry Tortugas National Park
> 950 N Krome Ave (3rd Floor)
> Homestead, Florida 33034
> Steve_Friedman at nps.gov
> Office (305) 224 - 4282
> Fax (305) 224 - 4147
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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