uncompress(uncompress)
uncompress()所属R语言包：uncompress
Uncompress .Z file data
Z文件解压缩。数据
译者：生物统计家园网 机器人LoveR
描述----------Description----------
Uncompresses data compressed with the "compress" utility. Data pass in and returned are both raw binary strings. Invalid compressed data results in an error being returned.
解压缩数据压缩的“压缩”程序。数据传递和返回都是原始的二进制字符串。无效的压缩数据会导致错误被退回。
用法----------Usage----------
uncompress(data)
参数----------Arguments----------
参数：data
The raw binary data to decompress.</table>
原始二进制数据进行解压缩。</ TABLE>
实例----------Examples----------
library("uncompress")
## Not run: [＃不运行：]
## Example 1 - extracting text data from a .Z file.[＃示例1 - 从Z文件中提取文本数据。]
handle <- file("file.Z", "rb")
# The size here is arbitrary, it should be large enough for most files,[这里的大小是任意的，它应该足够大，对于大多数文件，]
# adjust as necessary.[调整是必要的。]
data <- readBin(handle, "raw", 99999999)
close(handle)
uncomp_data <- uncompress(data)
# At this point you might want to check if uncomp_data is NULL in case the[在这一点上，你可能要检查的情况下，如果uncomp_data是NULL]
# file is corrupt.[文件已损坏。]
# This is assuming it's Unix-style text (i.e. \n separates lines).[这是假设它的Unix风格的文本（即\ n分隔行）。]
# If it's Windows-style text you may need to use "\r\n".[如果是Windows风格的文字，你可能需要使用“\ r \ n”。]
lines <- strsplit(rawToChar(uncomp_data), "\n")
print(lines)
## Example 2 - extracting text data from a .Z file at an HTTP host.[＃2 - 在一个HTTP主机从Z文件中提取文本数据。]
handle <- url("http://host/path/file.Z", "rb")
# The size here is arbitrary, it should be large enough for most files,[这里的大小是任意的，它应该足够大，对于大多数文件，]
# adjust as necessary.[调整是必要的。]
data <- readBin(handle, "raw", 99999999)
close(handle)
uncomp_data <- uncompress(data)
# At this point you might want to check if uncomp_data is NULL in case the[在这一点上，你可能要检查的情况下，如果uncomp_data是NULL]
# file is corrupt.[文件已损坏。]
# This is assuming it's Unix-style text (i.e. \n separates lines).[这是假设它的Unix风格的文本（即\ n分隔行）。]
# If it's Windows-style text you may need to use "\r\n".[如果是Windows风格的文字，你可能需要使用“\ r \ n”。]
lines <- strsplit(rawToChar(uncomp_data), "\n")
print(lines)
## Example 3 - downloading a .Z file, then uncompressing it.[＃3 - 。Z文件下载，然后解压缩。]
# Mode is important, in Windows if you don't use binary mode the compressed[模式是很重要的，在Windows中，如果你没有使用二进制模式下压缩]
# data will be corrupted.[数据将被破坏。]
download.file("http://host/path/file.Z", "file.Z", mode="wb")
handle <- file("file.Z", "rb")
# The size here is arbitrary, it should be large enough for most files,[这里的大小是任意的，它应该足够大，对于大多数文件，]
# adjust as necessary.[调整是必要的。]
data <- readBin(handle, "raw", 99999999)
close(handle)
uncomp_data <- uncompress(data)
# At this point you might want to check if uncomp_data is NULL in case the[在这一点上，你可能要检查的情况下，如果uncomp_data是NULL]
# file is corrupt.[文件已损坏。]
# This is assuming it's Unix-style text (i.e. \n separates lines).[这是假设它的Unix风格的文本（即\ n分隔行）。]
# If it's Windows-style text you may need to use "\r\n".[如果是Windows风格的文字，你可能需要使用“\ r \ n”。]
lines <- strsplit(rawToChar(uncomp_data), "\n")
print(lines)
## Example 4 - downloading a .Z file, writing the uncompressed data to a[例4 - 下载。Z文件，未压缩数据写入到]
## local file.[＃本地文件。]
handle <- url("http://host/path/file.Z", "rb")
# The size here is arbitrary, it should be large enough for most files,[这里的大小是任意的，它应该足够大，对于大多数文件，]
# adjust as necessary.[调整是必要的。]
data <- readBin(handle, "raw", 99999999)
close(handle)
uncomp_data <- uncompress(data)
handle <- file("file", "wb")
writeBin(uncomp_data, handle)
close(handle)
## End(Not run)[＃（不执行）]
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注：
注1：为了方便大家学习，本文档为生物统计家园网机器人LoveR翻译而成，仅供个人R语言学习参考使用，生物统计家园保留版权。
注2：由于是机器人自动翻译，难免有不准确之处，使用时仔细对照中、英文内容进行反复理解，可以帮助R语言的学习。
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发表于 2012-10-1 13:19:37
