I've got an error with the way I'm using readBin on a binary file of unknown internal structure. I know the structure consists of rows and columns, but I'm not sure how many of each. So, does anyone know of a valid test set of binary data that I could reference while trying to figure out the technique of using readBin? It would be really helpful to try out readBin on a readily available and understood binary file instead of starting with one of dubious internal structure. Thank you again for your help and feedback.
Test Binary File
3 messages · Jason Rupert, jim holtman, Duncan Murdoch
Do you know how it is structured? Is it 64-bit floating point, 32-bit floating point, 64 bit integer, 32 bit integer, byte values, etc.? If we know the structure, then we can determine how to decode the information.
On Wed, Nov 25, 2009 at 7:34 AM, Jason Rupert <jasonkrupert at yahoo.com> wrote:
I've got an error with the way I'm using readBin on a binary file of unknown internal structure. ?I know the structure consists of rows and columns, but I'm not sure how many of each. So, does anyone know of a valid test set of binary data that I could reference while trying to figure out the technique of using readBin? It would be really helpful to try out readBin on a readily available and understood binary file instead of starting with one of dubious internal structure. Thank you again for your help and feedback.
______________________________________________ R-help at r-project.org 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.
Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve?
On 25/11/2009 7:34 AM, Jason Rupert wrote:
I've got an error with the way I'm using readBin on a binary file of unknown internal structure. I know the structure consists of rows and columns, but I'm not sure how many of each. So, does anyone know of a valid test set of binary data that I could reference while trying to figure out the technique of using readBin? It would be really helpful to try out readBin on a readily available and understood binary file instead of starting with one of dubious internal structure.
You can write your own. For example, f <- tempfile() writeBin(as.numeric(1:100), f) The hexView package is very nice for seeing what you've got: library(hexView) viewRaw(f) which will show something like this: 0 : 00 00 00 00 00 00 f0 3f 00 00 00 00 00 00 00 40 | .......?.......@ 16 : 00 00 00 00 00 00 08 40 00 00 00 00 00 00 10 40 | ....... at .......@ 32 : 00 00 00 00 00 00 14 40 00 00 00 00 00 00 18 40 | ....... at .......@ ... viewRaw(f, human="real") will show 0 : 00 00 00 00 00 00 f0 3f 00 00 00 00 00 00 00 40 | 1 2 16 : 00 00 00 00 00 00 08 40 00 00 00 00 00 00 10 40 | 3 4 32 : 00 00 00 00 00 00 14 40 00 00 00 00 00 00 18 40 | 5 6 48 : 00 00 00 00 00 00 1c 40 00 00 00 00 00 00 20 40 | 7 8 ... Duncan Murdoch