pMatrix-class(Matrix)
pMatrix-class()所属R语言包：Matrix
Permutation matrices
置换矩阵
译者：生物统计家园网 机器人LoveR
描述----------Description----------
The "pMatrix" class is the class of permutation
"pMatrix"类是置换类
类的对象----------Objects from the Class----------
Objects can be created by calls of the form new("pMatrix", ...) or by coercion from an integer permutation vector, see below.
可以通过电话的形式创建对象new("pMatrix", ...)或胁迫整数置换向量，见下文。
插槽----------Slots----------
perm: An integer, 1-based permutation vector, i.e. an integer vector of length Dim[1] whose elements form a
perm：一个整数，1基于置换向量，即长度Dim[1]整数向量，其元素组成一个
Dim: Object of class "integer". The dimensions of the matrix which must be a two-element vector of equal,
Dim类"integer"的对象。矩阵的尺寸必须是平等的两个元素的向量，
Dimnames: list of length two; each component containing NULL or a character vector length
Dimnames：长度为二的名单;每个组件包含NULL或一个character向量的长度
延伸----------Extends----------
Class "sparseMatrix" and "generalMatrix", directly.
类"sparseMatrix"和"generalMatrix"，直接。
方法----------Methods----------
%*% signature(x = "matrix", y = "pMatrix") and other
％*％signature(x = "matrix", y = "pMatrix")和其他
coerce signature(from = "integer", to = "pMatrix"): This is enables typical "pMatrix" construction, given
要挟signature(from = "integer", to = "pMatrix")：这是使典型的"pMatrix"建设，给予
coerce signature(from = "numeric", to = "pMatrix"): a user convenience, to allow as(perm, "pMatrix") for
要挟signature(from = "numeric", to = "pMatrix")：方便用户，让as(perm, "pMatrix")
coerce signature(from = "pMatrix", to = "matrix"): coercion to a traditional FALSE/TRUE matrix of mode logical. (in earlier version of Matrix, it resulted in a 0/1-integer matrix; logical makes slightly more sense, corresponding better to the “natural” sparseMatrix counterpart,
强制signature(from = "pMatrix", to = "matrix")：强迫传统FALSE /真matrixmodelogical。 （在早期版本的Matrix，它导致在0/1-integer矩阵;logical稍微更有意义，更好地对应“自然”sparseMatrix的对口，
coerce signature(from = "pMatrix", to = "ngTMatrix"):
强制signature(from = "pMatrix", to = "ngTMatrix")：
determinant signature(x = "pMatrix", logarithm="logical"): Since permutation matrices are orthogonal, the determinant must be +1 or -1. In fact, it is exactly the sign of the
行列式signature(x = "pMatrix", logarithm="logical")：由于置换矩阵是正交的，行列式必须是+1或-1。事实上，正是标志
solve signature(a = "pMatrix", b = "missing"): return
解决signature(a = "pMatrix", b = "missing")：返回
t signature(x = "pMatrix"): return the transpose of the permuation matrix (which is also the inverse of the
Tsignature(x = "pMatrix")：返回的permuation矩阵的转置（这也是逆
注意----------Note----------
The inverse of the typical "pMatrix" constructor, P <- as(ip, "pMatrix") is simply ip <- P@perm.
逆的典型"pMatrix"构造，P <- as(ip, "pMatrix")的只是ip <- P@perm。
Subsetting (“indexing”, including, diag) "pMatrix" objects treats themas nonzero-pattern matrices, i.e., as "ngTMatrix" such that non-matrix subsetting result in logical vectors. Sub-assignment (M[i,j] <- v) is not sensible and hence an error for these permutation matrices.
子集（“索引”，包括diag）"pMatrix"等非矩阵子集在"ngTMatrix"向量的结果logical对象对待themas非零模式矩阵，即。小组分配（M[i,j] <- v）是不理智的，因此这些置换矩阵的错误。
举例----------Examples----------
(pm1 <- as(as.integer(c(2,3,1)), "pMatrix"))
t(pm1) # is the same as[是一样的]
solve(pm1)
pm1 %*% t(pm1) # check that the transpose is the inverse[检查的转逆]
stopifnot(all(diag(3) == as(pm1 %*% t(pm1), "matrix")),
is.logical(as(pm1, "matrix")))
set.seed(11)
## random permutation matrix :[＃随机置换矩阵：]
(p10 <- as(sample(10),"pMatrix"))
## Permute rows / columns of a numeric matrix :[＃表，改变行/列数字矩阵：]
(mm <- round(array(rnorm(3 * 3), c(3, 3)), 2))
mm %*% pm1
pm1 %*% mm
try(as(as.integer(c(3,3,1)), "pMatrix"))# Error: not a permutation[错误：不是一个置换]
as(pm1, "ngTMatrix")
p10[1:7, 1:4] # gives an "ngTMatrix" (most economic!)[给“ngTMatrix”（最经济！）]
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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 2012-2-16 18:08:52
