placeFeatures(ChIPsim)
placeFeatures()所属R语言包：ChIPsim
Generating and reconciling a feature sequence
生成和协调的功能序列
译者：生物统计家园网 机器人LoveR
描述----------Description----------
This function provides an interface to makeFeatures and reconcileFeatures that combines both steps of the feature generation process.
此功能提供了一个接口makeFeatures和reconcileFeatures相结合的功能生成过程的两个步骤。
用法----------Usage----------
placeFeatures(..., maxTail = 0.01,
compoundFeatures=list("StablePhasedFeature"))
参数----------Arguments----------
参数：...
Arguments to makeFeatures.
参数makeFeatures。
参数：maxTail
Maximum portion of total length of chromosome that may be left free of features (see Details).
最大部分的功能，可留待免费的染色体总长度（见详情）。
参数：compoundFeatures
List of feature classes that are produced by combining two features. This may happen during the call to reconcileFeatures and requires special handling when extending the feature list.
名单的功能，它是由两个特点结合产生的类。这可能发生在呼叫reconcileFeatures和延伸的功能列表时需要特殊处理。
Details
详情----------Details----------
This function (as well as makeFeatures which it calls) tries to fill as much of the genomic region with features as possible, i.e. an attempt is made to produce a feature sequence that covers length base pairs. In most cases the sequence will be slightly shorter. The maxTail argument determines how long a region without any features at the end of the genomic region is acceptable (as fraction of the total length). Note however that even maxTail = 0 does not guarantee a feature sequence of exactly the requested length.
此功能（以及为它呼吁makeFeatures这）试图填补功能，尽可能多的基因组区域，即尝试将产生一个特征序列，涵盖length碱基对。序列，在大多数情况下会稍有缩短。 maxTail参数决定多久是可以接受的一个区域，没有任何功能的基因组区域（总长度的一小部分）。但是请注意，即使maxTail = 0不保证完全的请求的长度特征序列。
值----------Value----------
A list of simulated features. The class of the return value as well as the features generated depend on the arguments passed to makeFeatures.
模拟功能列表。返回值的类，以及产生的功能取决于参数传递到makeFeatures。
注意----------Note----------
Using the reconcileFeatures mechanism it is possible to introduce dependence between neighbouring features that is not easily expressed in terms of a simple Markov model. In some cases the same effect can be achieved by introducing additional states into the model but it may be more convenient to simply post-process the feature sequence.
使用reconcileFeatures机制，是有可能引进邻国之间的特点，是不容易在一个简单的马尔可夫模型表示的依赖。在某些情况下达到同样的效果可以通过该模型引入更多的国家，但以简单的后期处理功能序列，它可能会更方便。
作者（S）----------Author(s)----------
Peter Humburg
参见----------See Also----------
makeFeatures, reconcileFeatures
makeFeatures，reconcileFeatures
举例----------Examples----------
set.seed(1)
## generate a (relatively short) sequence of nucleosome features[＃产生的核小体的功能（比较短）序列。]
features <- placeFeatures(length=1e6, maxTail = 0)
## check the total length of the features[＃查询功能的总长度]
sum(sapply(features, "[[", "length")) ## 990509[＃990509]
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。
注3：如遇到不准确之处，请在本贴的后面进行回帖，我们会逐渐进行修订。
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发表于 2012-2-25 14:56:45
