查询词典 permutation operator

If G is not of this form, H can be obtained by first performing a colunm permutation to put G into the form , and then performing the inverse permutation on .

如果G不具有这种形式，则可先通过列置换将G变换成形式，然后再对进行逆置换而得到H。

By using these "ranking" and "unranking" algorithms, any permutation that is positioned in lexicographic order, away from a given permutation by any specific distance, can be generated. This significant benefit is the main difference between the proposed method and previously published alternatives.

藉由此个演算法，我们可以产生一个n项目的排任意距，依字母大小序而言，的另一个排；此特点是我们的方法与其它研究最同的地方。

This dissertation mainly investigated two frameworks of H-matrix, such as SPB framework consisting of integer Subscript matrix, Permutation matrix and Bidiagonal matrix and MSPT framework consisting of Masking matrix, sparse Subscript matrix, Permutation matrix and approximately lower Triangular array matrix.

本文主要研究了两种H矩阵的类随机框架结构模型，一是SPB框架，由整数下标矩阵、置换矩阵、双对角线矩阵构成；二是MSPT框架，由稀疏下标矩阵、模板矩阵、置换矩阵和近似下三角阵列矩阵构成。

The determination of the suborbits of a permutation group is one of the basic problems in the permutation group theory.

一个有限传递置换群的点稳定子群的轨道称为该群的次轨道。

All patients we re randomly divided into four groups.Mannitol group,in which patients were trea ted only with mannitol .Permutation group in which patient's were treated with mannitol f ollowed cerebrospinal fluid permutation.

将患者随机分为4组治疗：单独应用甘露醇治疗头痛及在甘露醇应用的基础上行脑脊液置换、地塞米松鞘内注射和静脉注射，对比观察4个组的止痛效果。

The method for constructing LDPCC code includes encoder and decoder. Operational steps include as following: determining parameters of checkout matrix HQT of group code of permutation unit matrix LDPC; constructing checkout matrix HQT of group code of permutation unit matrix LDPC; constructing checkout polynomial matrix HT of LDPCC code; exporting generated matrix G of LDPCC code.

一种LDPCC码的构造方法，包括编、译码器，运行的步骤包括：初始化的步骤；确定一个置换单位矩阵LDPC分组码的校验阵HQT的参数的步骤；构造置换单位矩阵LDPC码校验阵HQT的步骤；构造LDPCC码的校验多项式矩阵HT的步骤；导出LDPCC码的生成矩阵G的步骤。

Current, regular to searching the permutation of the result acknowledge spends search user inferior, the permutation that the user of close 2/3 expresses not to know to search a result is regular.

目前，搜索用户对搜索结果的排列规则认知度较低，近2/3的用户表示不知道搜索结果的排列规则。

Pages: 444 This landmark among mathematics texts applies group theory to quantum mechanics, first covering unitary geometry, quantum theory, groups and their representations, then applications themselves—rotation, Lorentz, permutation groups, symmetric permutation groups, and the algebra of symmetric transformations.

页： 在数学正文中的444这标志建筑物把群论用于量力学，首先包括单位的几何学，量子理论，组和他们的表现，应用themselvesotation，洛伦茨，换变组，匀称换变组和匀称的转变的代数的然后。

The investigations in this thesis focus on several aspects as follows: We investigate the method that how to produce permutation matrix by using chaotic map, and get the method of image permutation based on chaotic map. This method can make original image to unorderly image to protect the true content of image. We investigate gray level mix function, and put forward a gray level mix function based on chaotic map. Because this function has chaotic characteristics, the image dealed with this function has very uniform histogram. Aiming at the contradiction between error robust and security on image encryption, we put forward a kind of gray level mix function including diffusion mechanism.

本文的研究工作主要集中在以下几方面：研究了如何利用混沌映射产生置乱矩阵的方法，给出了基于混沌的数字图像置乱方法，该方法能够将原始图像变成面目全非的杂乱图像，从而保护了数字图像的真实内容；研究了灰级混合函数，提出了基于混沌的灰级混合函数，由于该函数具有混沌特性，所以经过该函数处理后的图像具有非常均衡的灰级直方图；针对图像加密的错误鲁棒性与安全性之间的矛盾，提出了一种含有扩散机制的灰级混合函数。

If this is the smallest permutation, then it reorders the sequence to be the largest permutation and returns false.

如果这是最小的排列，则它将序列重新排列为最大排列，并返回 false。

Panorama Many people are dancing in a large sitting room.

在一个大客厅里，许多人在跳舞。

We fully understand how a microwave oven cooks food, it is first necessary to talk ...

我们充分理解一个微波炉煮的食物，这是首先要谈。。。