readXStringColumns(ShortRead)
readXStringColumns()所属R语言包：ShortRead
Read one or more columns into XStringSet (e.g., DNAStringSet) objects
XStringSet（如，DNAStringSet）的对象读入一个或多个列
译者：生物统计家园网 机器人LoveR
描述----------Description----------
This function allows short read data components such as DNA sequence, quality scores, and read names to be read in to XStringSet (e.g., DNAStringSet, BStringSet) objects. One or several files of identical layout can be specified.
此功能允许短的DNA序列，质量分数，读要读XStringSet（例如，DNAStringSet，BStringSet）对象的名称，如读取数据组件。可以指定一个或多个文件相同的布局。
用法----------Usage----------
readXStringColumns(dirPath, pattern=character(0),
colClasses=list(NULL),
nrows=-1L, skip=0L,
sep = "\t", header = FALSE, comment.char="#")
参数----------Arguments----------
参数：dirPath
A character vector giving the directory path (relative or absolute) of files to be read.
给一个特征向量要读取的文件的目录路径（相对或绝对）。
参数：pattern
The (grep-style) pattern describing file names to be read. The default (character(0)) reads all files in dirPath. All files are expected to have identical numbers of columns.
（grep式）模式描述被读取的文件名。默认（character(0)）dirPath读取所有文件。所有的文件预计将有相同数量的列。
参数：colClasses
A list of length equal to the number of columns in a file. Columns with corresponding colClasses equal to NULL are ignored. Other entries in colClasses are expected to be character strings describing the base class for the XStringSet. For instance a column of DNA sequences would be specified as "DNAString". The column would be parsed into a DNAStringSet object.
长度等于在一个文件中的列数列表。列与相应colClasses等于NULL被忽略的。在其他项colClasses预计将字符串描述XStringSet基类。例如，DNA序列的列将被指定为"DNAString"。列将被解析成一个DNAStringSet对象。
参数：nrows
A length 1 integer vector describing the maximum number of XString objects to read into the set. Reads may come from more than one file when dirPath and pattern parse several files and nrow is greater than the number of reads in the first file.
一个长度为1的整数向量XString对象的最大数量描述读入集。读取多个文件可能来自dirPath和pattern解析多个文件和nrow是大于在第一个文件的读取次数。
参数：skip
A length 1 integer vector describing how many lines to skip at the start of each file.
一个长度为1的整数向量描述每个文件开始跳过多少行。
参数：sep
A length 1 character vector describing the column separator.
一个长度为1的特征向量描述的列分隔符。
参数：header
A length 1 logical vector indicating whether files include a header line identifying columns. If present, the header of the first file is used to name the returned values.
一个长度为1的逻辑向量表示文件是否包括标识列的标题行。如果目前的第一个文件头被用来命名返回值。
参数：comment.char
A length 1 character vector, with a single character that, when appearing at the start of a line, indicates that the entire line should be ignored. Currently there is no way to use comment characters in other than the first position of a line.
一个长度为1的特征向量，用一个单一的字符，行开始出现时，表示整条生产线，应该被忽略。目前还没有办法使用注释字符的行的第一个位置以外。
值----------Value----------
A list, with each element containing an XStringSet object of the type corresponding to the non-NULL elements of colClasses.
一个列表，每个元素包含一个XStringSetcolClasses非NULL的元素对应的类型的对象。
作者（S）----------Author(s)----------
Martin Morgan <mtmorgan@fhcrc.org>
举例----------Examples----------
## valid character strings for colClasses[＃colClasses有效的字符串]
names(slot(getClass("XString"), "subclasses"))
dirPath <- system.file('extdata', 'maq', package='ShortRead')
colClasses <- rep(list(NULL), 16)
colClasses[c(1, 15, 16)] <- c("BString", "DNAString", "BString")
## read one file[＃读取一个文件]
readXStringColumns(dirPath, "out.aln.1.txt", colClasses=colClasses)
## read all files into a single object for each column[＃读入一个单一的对象为每列中的所有文件]
res <- readXStringColumns(dirPath, colClasses=colClasses)
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。
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发表于 2012-2-26 14:06:39
