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• Statistical Inference 统计推断
• Statistical Computing 统计计算
• (Generalized) Linear Models 广义线性模型
• Statistical Machine Learning 统计机器学习
• Longitudinal Data Analysis 纵向数据分析
• Foundations of Data Science 数据科学基础

## cs代写|复杂网络代写complex network代考|Main results for directed fixed communication topology

In this subsection, consensus tracking of CNS (5.33) with target trajectory given in (5.36) under a fixed communication topology is studied. Without loss of generality, let $\mathcal{G}(\mathcal{A}(t))=\mathcal{G}(\mathcal{A})$ for all $t \geq 0$. And we label the target as agent 0 .

Assumption 5.2 There exists at least one directed spanning tree rooted at agent 0 (i.e., the target) in the augmented communication topology $\mathcal{G}(\widetilde{\mathcal{A}})$.

It is clearly that Assumption $5.2$ will hold if all the agents $1, \ldots, N$ are pinned, i.e., $c_{i}(t)=1$, for all $i=1, \ldots, N$ and $t \geq 0$. However, it is more interesting to study how to make Assumption $5.2$ hold if only a small fraction of the agents in $\mathcal{G}(\mathcal{A})$ could be selected and pinned. To do this, the following algorithm is proposed to determine at least how many and what kinds of agents should be pinned such that Assumption $5.2$ holds.

Algorithm 5.2 Find the strongly connected components of $\mathcal{G}(\mathcal{A})$ by employing the Tarjan’s algorithm [157]. Note that the time complexity of this operation is $O(N+E)$, where $N$ and $E$ are, respectively, the numbers of agents and links of $\mathcal{G}(\mathcal{A})$. Suppose that there are $\omega$ strongly connected components in $\mathcal{G}(\mathcal{A})$, labeled as $W_{1}, W_{2}, \ldots, W_{\omega}$. Set $m_{i}=0, i=1, \ldots, \omega$, and $h=1$. Then, execute the following steps
(1) Check whether there exists at least one agent $n_{k}$ belonging to $W_{h}$ which is reachable from an agent $n_{g}$ belonging to $W_{j}, j=1, \ldots, \omega, j \neq h$. If it holds, go to step (2); if it dose not hold, go to step (3).
(2) Check whether the following condition holds: $h<\omega$. If it holds, let $h=h+1$ and re-perform step (1); else stop.
(3) Arbitrarily selected one agent in $W_{h}$ and pinned, let $m_{h}=1$; Check whether the following condition holds: $h<\omega$. If it holds, let $h=h+1$ and re-perform step (1); else stop.

## cs代写|复杂网络代写complex network代考|Main results for directed switching communication topologies

The underlying topology of the CNS considered in this subsection is modeled by directed switching graphs. Let $\overline{\mathcal{G}}=\left{\mathcal{G}\left(\mathcal{A}^{1}\right), \ldots, \mathcal{G}\left(\mathcal{A}^{\kappa}\right)\right}, \kappa \geq 2$, indicate the set of all possible directed communication topologies. Suppose that there exists an infinite sequence of uniformly bounded non-overlapping time intervals $\left[t_{k}, t_{k+1}\right), k \in \mathbb{N}$, with $t_{0}=0$, over which the interaction graph is fixed. The time sequence $t_{k}, k \in \mathbb{N}$ is then called the switching sequence, at which the interaction graph changes. Furthermore, introduce a switching signal $\sigma(t):[0,+\infty) \mapsto{1, \ldots, \kappa}$. Then, let $\mathcal{G}\left(\mathcal{A}^{\sigma(t)}\right)$ be the communication topology of the CNS at time $t$. Note that $\mathcal{G}\left(\mathcal{A}^{\sigma(t)}\right) \in \overline{\mathcal{G}}$, for all $t \geq 0$. The error dynamical system (5.39) can be rewritten as
\begin{aligned} \dot{e}{i}(t)=& A e{i}(t)+\beta x_{i}(t) B e_{i}(t)+\beta e_{i}(t) B s(t)-\alpha \sum_{j=1}^{N} l_{i j}^{\sigma(t)} H e_{j}(t) \ &-\alpha c_{i}(t) H e_{i}(t), i=1, \ldots, N \end{aligned}
where $\mathcal{L}^{\sigma(t)}=\left[l_{i j}^{\sigma(t)}\right]{N \times N}$ is the Laplacian matrix of communication topology $\mathcal{G}\left(\mathcal{A}^{\sigma(t)}\right)$. Throughout this section, the time derivatives of functions $e{i}(t)$ and $x_{i}(t)$ at any switching instant represent its right derivative.

Assumption 5.3 There exists at least one directed spanning tree rooted at agent 0 (i.e., the target) in the augmented communication topology $\mathcal{G}\left(\tilde{\mathcal{A}}^{\sigma(t)}\right)$.

Remark 5.10 Applying Algorithm $5.2$ to each possible communication topology $\mathcal{G}\left(\mathcal{A}^{i}\right), i=1, \ldots, \kappa$, one gets that Assumption $5.3$ will hold if the selected agents are pinned.

## cs代写|复杂网络代写complex network代考|Main results for directed fixed communication topology

(1) 检查是否存在至少一个代理 $n_{k}$ 属于 $W_{h}$ 可以从代理访问 $n_{g}$ 属于 $W_{j}, j=1, \ldots, \omega, j \neq h$. 如果成立，则进行步骙 (2) ；如果不成立， 转至步骤 (3)。
(2) 检龺下列条件是否成立： $h<\omega$. 如果它成立，让 $h=h+1$ 并重新执行步骤（1）；否则停止。
(3) 任意选择一名代理人 $W_{h}$ 并固定，让 $m_{h}=1$; 检查以下条件是否成立: $h<\omega$. 如果它成立，让 $h=h+1$ 并重新执行步骤（1）；否则 停止。

## cs代写|复杂网络代写complex network代考|Main results for directed switching communication topologies

$$\dot{e} i(t)=A e i(t)+\beta x_{i}(t) B e_{i}(t)+\beta e_{i}(t) B s(t)-\alpha \sum_{j=1}^{N} l_{i j}^{\sigma(t)} H e_{j}(t) \quad-\alpha c_{i}(t) H e_{i}(t), i=1, \ldots, N$$

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MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。

assignmentutor™您的专属作业导师
assignmentutor™您的专属作业导师