pdMat(nlme)
pdMat()所属R语言包：nlme
Positive-Definite Matrix
正定矩阵
译者：生物统计家园网 机器人LoveR
描述----------Description----------
This function gives an alternative way of constructing an object inheriting from the pdMat class named in pdClass, or from data.class(object) if object inherits from pdMat, and is mostly used internally in other functions. See the documentation on the principal constructor function, generally with the same name as the pdMat class of object.
此功能提供了一个pdMatpdClass或data.class(object)如果object继承pdMat，命名类继承构造一个对象的替代方式主要用于内部其他职能。 pdMat对象类的名称相同，一般看到的主要构造函数的文档。
用法----------Usage----------
pdMat(value, form, nam, data, pdClass)
参数----------Arguments----------
参数：value
an optional initialization value, which can be any of the following: a pdMat object, a positive-definite matrix, a one-sided linear formula (with variables separated by +), a vector of character strings, or a numeric vector. Defaults to numeric(0), corresponding to an uninitialized object.
一个可选的初始化值，它可以是下列任何一个pdMat对象，正定矩阵，一种片面的线性公式（与+分离变量），字符串向量或数字向量。 numeric(0)默认值，相应的未初始化的对象。
参数：form
an optional one-sided linear formula specifying the row/column names for the matrix represented by object. Because factors may be present in form, the formula needs to be evaluated on a data.frame to resolve the names it defines. This argument is ignored when value is a one-sided formula. Defaults to NULL.
一个可选的片面指定行/列名为object为代表的矩阵的线性公式。由于因素可能是在form目前，该公式需要评估数据框上，以解决它定义的名字。时value是一种片面的公式，则忽略此参数。 NULL默认。
参数：nam
an optional vector of character strings specifying the row/column names for the matrix represented by object. It must have length equal to the dimension of the underlying positive-definite matrix and unreplicated elements. This argument is ignored when value is a vector of character strings. Defaults to NULL.
由对象代表一个字符字符串指定为矩阵的行/列名的可选向量。它必须有长度等于底层正定矩阵和非复制的元素的尺寸。时value是一个字符串向量，则忽略此参数。 NULL默认。
参数：data
an optional data frame in which to evaluate the variables named in value and form. It is used to obtain the levels for factors, which affect the dimensions and the row/column names of the underlying matrix. If NULL, no attempt is made to obtain information on factors appearing in the formulas. Defaults to the parent frame from which the function was called.
在其中评估value和form命名的变量的可选数据框。用它来获得factors，这影响的尺寸和基础矩阵的行/列名的水平。如果NULL，没有尝试获得factors公式中出现的信息。默认从该函数被调用的父框架。
参数：pdClass
an optional character string naming the pdMat class to be assigned to the returned object. This argument will only be used when value is not a pdMat object. Defaults to "pdSymm".
一个可选的字符串，命名pdMat类被分配到返回的对象。这种说法只会被用来当value是不是pdMat对象。 "pdSymm"默认。
值----------Value----------
a pdMat object representing a positive-definite matrix, inheriting from the class named in pdClass, or from class(object), if object inherits from pdMat.
pdMat对象代表正定矩阵从pdClass，或从命名的类继承class(object)从objectpdMat继承。
作者（S）----------Author(s)----------
Jose Pinheiro and Douglas Bates <a href="mailto:bates@stat.wisc.edu">bates@stat.wisc.edu</a>
参考文献----------References----------
in S and S-PLUS", Springer.
参见----------See Also----------
pdClasses, pdCompSymm, pdDiag, pdIdent, pdNatural, pdSymm, reStruct, solve.pdMat, summary.pdMat
pdClasses，pdCompSymm，pdDiag，pdIdent，pdNatural，pdSymm，reStruct，solve.pdMat，summary.pdMat
举例----------Examples----------
pd1 <- pdMat(diag(1:4), pdClass = "pdDiag")
pd1
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 2012-2-16 18:12:37
