similar to: rawToChar(raw(0))

Hi, A piece of my code that uses readBin() to read a certain file type is behaving strangely with R 2.7.0. This seems to be because of a failure to match() strings after using rawToChar() when the original was terminated with a "\0" character. Direct equality testing with == still works as expected. I can reproduce this as follows: > x <- "foo" > y <-

Hi, I'm running into more issues when reading data from a gzfile connection. If I read the data sequentially with successive calls to readBin(), the data I get looks ok. But if I call seek() between the successive calls to readBin(), I get corrupted data. Here is a (hopefully) reproducible example. See my sessionInfo() at the end (I'm not on Windows, where, according to the man page,

Hi, I am puzzled with serialize(). It comes down generating identical hash codes for (apparently) identical objects using digest::digest(), which in turn relies on serialize(). Here is an example illustration the issue: ser <- function(object, ...) { list( names = names(object), namesRaw = charToRaw(names(object)), ser = serialize(names(object), connection=NULL, ascii=FALSE)

Hello, All: Do you know of any capability to substitute more then one byte in an object of class Raw? Consider the following: > let4 <- paste(letters[1:4], collapse='') > (let4Raw <- charToRaw(let4)) [1] 61 62 63 64 > (let. <- sub('bc', '--', let4Raw)) [1] "61" "62" "63" "64" > # no

Hello, Suppose in the following code, PROTECT(sr = R_tryEval( .... )) sr is a RAWSXP vector. I wish to return another RAWSXP starting at position 13 onwards (base=0). I could create another RAWSXP of the correct length and then memcpy the required bytes and length to this new one. However is there a more efficient method? Regards Saptarshi Guha

Dear R experts, It seems that Rprintf has to be used to print from a C routine to guarantee to write to R?s output according to https://cran.r-project.org/doc/manuals/r-release/R-exts.html#Printing. However if a string is UTF-8 encoded, non-ASCII characters (e.g., the infinity symbol http://www.fileformat.info/info/unicode/char/221e/index.htm) are misprinted. Is this an unsupported feature or is

Un texte encapsul? et encod? dans un jeu de caract?res inconnu a ?t? nettoy?... Nom : non disponible URL : <https://stat.ethz.ch/pipermail/r-help/attachments/20100727/2e19110f/attachment.pl>

Does anyone know if there is a simple way to print raw vectors, such that ASCII characters are printed for bytes in the ASCII range, and their hex representation otherwise? rawToChar doesn't work when we have something like c(0x00, 0x00, 0x44, 0x00). -Matt

Hi, ?rawToChar 'rawToChar' converts raw bytes either to a single character string or a character vector of single bytes. (Note that a single character string could contain embedded nuls.) Allowing embedded nuls in a string might be an interesting experiment but it seems to cause some troubles to most of the string manipulation functions. A string with an embedded 0:

Dear List, I have a list of 600+ *.gz files that I would like to extract and read the geotiffs contained within them. I tried using the untar() function to simplify this task but I am stumped by an error. I've combed the Internet for a solution without luck. The details are below, and any help in solving this matter is appreciated. > files = list.files(path = "J:/GIMMS/NDVI",

I know that there is a function to convert binary data to string named rawToChar.but I wander is there any similar function for "Integer" and "float".I need to read some binary file in "integer" and "float" data. I can do this job in this way: (as below) first convert 4 byte raw to bits then pack bits back to "integer", but it not work for

Dear R-devel, I would like to launch the Rgui.exe from a Fortran console application (we will call this FortranCon.exe), that I have written myself. To do this, I send the command line "C:\Program Files\R\R-X.X.X\Rgui.exe" (where X.X.X is the version number) as an argument to the Windows API function CreateProcess (see http://msdn.microsoft.com/en-us/library/ms682425(VS.85).aspx)

Of course, right after writing this e-mail I tested on my Windows machine and did not see what I expected: > charToRaw(before) [1] c3 a9 > charToRaw(after) [1] e9 so obviously I'm misunderstanding something as well. Best, Kevin On Sat, Feb 17, 2018 at 2:19 PM, Kevin Ushey <kevinushey at gmail.com> wrote: > From my understanding, translation is implied in this line of ?file

Full_Name: Byron Ellis Version: 2.1.0 OS: OS X Submission from: (NULL) (67.124.246.46) > x = charToRaw("12345") > x [1] 31 32 33 34 35 > save(x,file="x.Rda") > rm(x) > load("x.Rda") > x [1] 00 00 00 00 00 Thats no fun.

Not a bug in a very strict sense, but still something to be fixed eventually: > s <- sapply(0:7, function(i) rawShift(charToRaw("my text"),i)) > s ... nothing is printed at all > str(s) raw [1:7, 1:8] 6d 79 20 74 ... > c(s) [1] 6d 79 20 74 65 78 74 da f2 40 e8 ca f0 e8 b4 e4 80 d0 94 e0 d0 68 c8 00 a0 [26] 28 c0 a0 d0 90 00 40 50 80 40 a0 20 00 80 a0 00 80 40 40 00

Hi, > x <- charToRaw("ABCDEFGx") > x[c(1:3, NA, 6)] <- x[8] *** caught segfault *** address 0x8402423f, cause 'memory not mapped' Possible actions: 1: abort (with core dump, if enabled) 2: normal R exit 3: exit R without saving workspace 4: exit R saving workspace Cheers, H. > sessionInfo() R version 2.10.0 Under development

Hi, I have zlib compressed strings (example is attached) and would like to decompress them using memDecompress ... I try this: > connection <- file("compressed.txt","r") > compressed <- readLines(connection) > memDecompress(as.raw(compressed),type="g") Error in memDecompress(as.raw(compressed), type = "g") : internal error -3 in

Dear R-Users, I need a very fast and reliable database solution so I try to serialize a data.frame (to binary data) and to store this data to an SQLite database. This is what I tried to do: library(RSQLite) con <- dbDriver("SQLite") db <- dbConnect(con, "test") dbSendQuery(db, 'CREATE TABLE frames("simID" INT, "data" BLOB)') data.bin <-

Hi there, I have the following problem and I hope somebody might help me. First of all: I am using WinXP SP3 (english and/or german) with R in Version 2.10.0. Now I am trying to install some packages but unfortunately I am getting a weird error. No matter which package I am trying to install - I nearly get the same error. It looks like this:

Hello, I would like to compress a long string (character vector), store the compressed string in the text field of a SQLite database (using RSQLite), and then load the text back into memory and decompress it back into the the original string. My character vector can be compressed considerably using standard gzip/bzip2 compression. In theory it should be much faster for me to compress/decompress