金融代写|金融工程作业代写Financial Engineering代考|BE953

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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

金融代写|金融工程作业代写Financial Engineering代考|Local Stability Properties of a Nonlinear Model

Local stability of a nonlinear model can be studied round the associated equilibria. Local linearization can be performed round equilibria, using the set of differential equations that describe the nonlinear model $\dot{x}=h(x)$ and performing Taylor series expansion, that is $\dot{x}=h(x) \Rightarrow \dot{x}=\left.h\left(x_{0}\right)\right|{x{0}}+\nabla_{x} h\left(x-x_{0}\right)+\cdots$.
The nonlinear model is taken to have the generic form
$$\left(\begin{array}{l} \dot{x}{1} \ \dot{x}{2} \end{array}\right)=\left(\begin{array}{l} f\left(x_{1}, x_{2}\right) \ g\left(x_{1}, x_{2}\right) \end{array}\right)$$
where $f\left(x_{1}, x_{2}\right)=2 x_{1}+x_{2}^{2}$ and $g\left(x_{1}, x_{2}\right)=x_{1}^{2}+2 x_{2}$. The fixed points of this model are computed from the condition $\dot{x}{1}=0$ and $\dot{x}{2}=0$. Using these relations one finds the equilibria $\left(x_{1}^{}, x_{2}^{}\right)=(0,0)$ and $\left(x_{1}^{}, x_{2}^{}\right)=(0,0)$
The Jacobian matrix $\nabla_{x} h=M$ is given by
$$M=\left(\begin{array}{ll} \frac{\partial f}{\partial x_{1}} & \frac{\partial f}{\partial x_{2}} \ \frac{\partial g}{\partial x_{1}} & \frac{\partial g}{\partial x_{2}} \end{array}\right)$$
which results into the matrix
$$J=\left(\begin{array}{cc} 2 & 2 x_{2} \ 2 x_{1} & 2 \end{array}\right)$$

金融代写|金融工程作业代写Financial Engineering代考|Phase Diagrams for Linear Dynamical Systems

The following autonomous linear system is considered
$$\dot{x}=A x$$
The eigenvalues of matrix $A$ define the system dynamics. Some terminology associated with fixed points is as follows:

A fixed point for the system of Eq. (1.27) is called hyperbolic if none of the eigenvalues of matrix $A$ has zero real part. A hyperbolic fixed point is called a saddle if some of the eigenvalues of matrix $A$ have real parts greater than zero and the rest of the eigenvalues have real parts less than zero. If all of the eigenvalues have negative real parts then the hyperbolic fixed point is called a stable node or sink. If all of the eigenvalues have positive real parts then the hyperbolic fixed point is called an unstable node or source. If the eigenvalues are purely imaginary then one has an elliptic fixed point which is said to be a center.
Case 1: Both eigenvalues of matrix $A$ are real and unequal, that is $\lambda_{1} \neq \lambda_{1} \neq 0$. For $\lambda_{1}<0$ and $\lambda_{2}<0$ the phase diagram for $z_{1}$ and $z_{2}$ is shown in Fig. 1.4. In case that $\lambda_{2}$ is smaller than $\lambda_{1}$ the term $e^{\lambda_{2} t}$ decays faster than $e^{\lambda_{1} t}$. For $\lambda_{1}>0>\lambda_{2}$ the phase diagram of Fig. $1.5$ is obtained.

金融代写|金融工程作业代写Financial Engineering代考|Local Stability Properties of a Nonlinear Model

$$(\dot{x} 1 \dot{x} 2)=\left(f\left(x_{1}, x_{2}\right) g\left(x_{1}, x_{2}\right)\right)$$

$$M=\left(\begin{array}{lll} \frac{\partial f}{\partial x_{1}} \quad \frac{\partial f}{\partial x_{2}} & \frac{\partial g}{\partial x_{1}} & \frac{\partial g}{\partial x_{2}} \end{array}\right)$$

金融代写|金融工程作业代写Financial Engineering代考|Phase Diagrams for Linear Dynamical Systems

$$\dot{x}=A x$$

有限元方法代写

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MATLAB代写

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。