addfile.gdsn {gdsfmt} | R Documentation |
Add a file to a GDS file as a node.
addfile.gdsn(node, name, filename, compress=c("ZIP", "ZIP_RA", "LZMA", "LZMA_RA", "LZ4", "LZ4_RA"), replace=FALSE, visible=TRUE)
node |
an object of class |
name |
the variable name; if it is not specified, a temporary name is assigned |
filename |
the file name of input stream. |
compress |
the compression method can be "" (no compression), "ZIP", "ZIP.fast", "ZIP.default", "ZIP.max" or "ZIP.none" (original zlib); "ZIP_RA", "ZIP_RA.fast", "ZIP_RA.default", "ZIP_RA.max" or "ZIP_RA.none" (zlib with efficient random access); "LZ4", "LZ4.none", "LZ4.fast", "LZ4.hc" or "LZ4.max"; "LZ4_RA", "LZ4_RA.none", "LZ4_RA.fast", "LZ4_RA.hc" or "LZ4_RA.max" (with efficient random access). See details |
replace |
if |
visible |
|
compress
:
Z compression algorithm (http://www.zlib.net/) can be used to
deflate the data stored in the GDS file. "ZIP" option is equivalent
to "ZIP.default". "ZIP.fast", "ZIP.default" and "ZIP.max" correspond
to different compression levels.
To support efficient random access of Z stream, "ZIP_RA", "ZIP_RA.fast", "ZIP_RA.default", "ZIP_RA.max" or "ZIP_RA.none" should be specified. "ZIP_RA" option is equivalent to "ZIP_RA.default:256K". The block size can be specified by following colon, and "16K", "32K", "64K", "128K", "256K", "512K", "1M", "2M", "4M" and "8M" are allowed, like "ZIP_RA:64K". The compression algorithm tries to keep each independent compressed data block to be about of the specified block size, like 64K.
LZ4 fast lossless compression algorithm is allowed when
compress="LZ4"
(http://code.google.com/p/lz4/). Three
compression levels can be specified, "LZ4.fast" (LZ4 fast mode),
"LZ4.hc" (LZ4 high compression mode), "LZ4.max" (maximize the
compression ratio). The block size can be specified by following colon,
and "64K", "256K", "1M" and "4M" are allowed according to LZ4 frame
format. "LZ4" is equivalent to "LZ4.hc:256K".
To support efficient random access of LZ4 stream, "LZ4_RA", "LZ4_RA.fast", "LZ4_RA.hc", "ZIP_RA.max" or "LZ4_RA.none" should be specified. "LZ4_RA" option is equivalent to "LZ4_RA.hc:256K". The block size can be specified by following colon, and "16K", "32K", "64K", "128K", "256K", "512K", "1M", "2M", "4M" and "8M" are allowed, like "LZ4_RA:64K". The compression algorithm tries to keep each independent compressed data block to be about of the specified block size, like 64K.
An object of class gdsn.class
.
Xiuwen Zheng
http://github.com/zhengxwen/gdsfmt
# save a .RData object obj <- list(X=1:10, Y=seq(1, 10, 0.1)) save(obj, file="tmp.RData") # cteate a GDS file f <- createfn.gds("test.gds") add.gdsn(f, "double", val=seq(1, 1000, 0.4)) addfile.gdsn(f, "tmp.RData", "tmp.RData") # open the GDS file closefn.gds(f) # open the existing file (f <- openfn.gds("test.gds")) getfile.gdsn(index.gdsn(f, "tmp.RData"), "tmp1.RData") (obj <- get(load("tmp1.RData"))) # open the GDS file closefn.gds(f) # delete the temporary files unlink(c("test.gds", "tmp.RData", "tmp1.RData"), force=TRUE)