[R] binary to R object

Prof Brian Ripley ripley at stats.ox.ac.uk
Wed Jul 30 22:14:27 CEST 2014

What type actually is 'binary' here?  We cannot tell, as writeBin will 
handle many types.

If 'binary' means a raw vector, two ways:

1) Use load() on a raw connection (see ?rawConnection).

2) Make use of the information in ?readRDS.  You can read the header 
from save() format by skipping the first 5 bytes, then call 
unserialize() on the rest of the raw vector.  (If the save was 
compressed, you need to handle decompression too: see ?memCompress.)

If you want more help, heed the footer of this and every R-help message 
and provide a complete reproducible example.

On 30/07/2014 20:56, Ramiro Barrantes wrote:
> Hello,
> I have stored R objects as hexadecimals in a mysql database, I then usually transform them to binary and then save it into a file.  E.g.
>    hex <- getBlob   #gets blob from database as hexadecimal
>    binary <- transformToBinary(hex)  #moves from hex to binary
> I would usually save them into a file as follows:
>    writeBin(object=binary,con="fileName.txt")
> Then eventually if I want to use it in R I just load it:
>    load("fileName.txt")
> However, how can I go from the binary directly into an Robject without writing it to a file?
>    say:
>    myObject <- unknownFunction(binary)
> I hope this is enough detail.  Any help appreciated.
> In retrospect, I could have probably used serialize/unserialize and store a serialize string in mysql and unserialize when needed ( or write to a file if necessary), but I didn't know of those when I did this.
> Thanks in advance,
> Ramiro
> 	[[alternative HTML version deleted]]
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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 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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