(有源代碼)數值分析作業,本文主要包括兩個部分,第一部分是常微分方程(ODE)的三個實驗題,第二部分是有關的拓展討論,包括高階常微分的求解和邊值問題的求解(BVP).文中的算法和算例都是基于Matlab計算的.ODE問題從剛性(STIFFNESS)來看分為非剛性的問題和剛性的問題,剛性問題(如大系數的VDP方程)用通常的方法如ODE45來求解,效率會很低,用ODE15S等,則效率會高多了.而通常的非剛性問題,用ODE45來求解會有很好的效果.從階次來看可以分為高階微分方程和一階常微分方程,高階的微分方程一般可以化為狀態空間(STATE SPACE)的低階微分方程來求解.從微分方程的性態看來,主要是微分方程式一階導系數大的時候,步長應該選得響應的小些.或者如果問題的性態不是太好估計的話,用較小的步長是比較好的,此外的話Adams多步法在小步長的時候效率比R-K(RUNGE-KUTTA)方法要好些,而精度也高些,但是穩定區間要小些.從初值和邊值來看,也是顯著的不同的.此外對于非線性常微分方程還有打靶法,胞映射方法等.而對于微分方程穩定性的研究,則諸如相平面圖等也是不可缺少的工具.值得提出的是,除了用ode系類函數外,用simulink等等模塊圖來求解微分方程也是一種非常不錯的方法,甚至是更有優勢的方法(在應用的角度來說).
上傳時間： 2014-01-05
上傳用戶：caixiaoxu26
C280x C/C++ Header Files and Peripheral Examples The DSP28xx C/C++ peripheral header files and example projects files facilitate writing C/C++ Code for the TI鈥檚 28xx MCUs. The code can be used as a learning tool or as the basis for a development platform depending on the current needs of the user. We suggest that you immediately download these header files in order for an easier transition to understanding the 28xx peripherals.
標簽： Peripheral peripheral and Examples
上傳時間： 2014-01-24
上傳用戶：fandeshun
A Design and Implementation of The Online Shopping System Abstract: Along with the development of the computer ,the database technique is widespread in the application of Internet, more and more , providing more thoughtful and humanized service for the large network customer. Characteristic services have already become gradually the current as the application of Wed nowadays. This text studied a method of project which composed of characteristic page and dynamic state of technical customer according to the data connection rule, compared with some projects that adopt already on present nets, this project have the advantage of providing customers more simple ,reflective obvious meticulous use and so on..
標簽： Implementation development Abstract Shopping
上傳時間： 2014-12-04
上傳用戶：410805624
開發人員使用JavaScript的一個主要原因就是可以避免回發過程中帶來的頁面刷新。例如我們可以根據用戶的需要使用Treeview控件來展開和折疊相應的數據節點。當你展開一個節點時，該Treeview控件將會利用JavaScript讀取服務器上的子節點信息，然后平滑無刷新地插入這些新節點。如果沒有使用JavaScript的話，Treeview控件將會因為頁面的回發而重新構建。不但用戶會發現因頁面刷新而帶來的延遲，而且頁面極有可能回復到原來的狀態，即丟失前面所展開的那些子節點信息。對于服務器端來說，因為每次回發的過程中都要處理大量的視圖狀態（View State）信息，這也會嚴重影響程序的整體執行性能。在ASP.NET 2.0中，引入了一個稱為"客戶端回調"的功能，利用這個內建的解決方案我們可以輕松實現客戶端腳本和服務器端代碼間的交互，從而避免了頁面因回發帶來的頻繁刷新。
標簽： JavaScript Treeview 節點 過程
上傳時間： 2017-05-24
上傳用戶：彭玖華
If you d like to know where visitors to your site live, add this to your feedback forms. They just choose a region, and the second menu changes appropriately, allowing them to choose their country. (If they choose USA, it allows them to select their state) Neat!
上傳時間： 2017-06-11
上傳用戶：wfeel
This tutorial explains how to communicate with IO devices on the DE2 Board and how to deal with interrupts using C and the Altera Monitor Program. Two example programs are given that diplay the state of the toggle switches on the red LEDs. The fi rst program uses the programmed I/O approach and the second program uses interrupts.
標簽： with communicate how tutorial
上傳時間： 2013-12-13
上傳用戶：熊少鋒
The objective is to set up SPI communication between VTI Technologies digital pressure sensor component and an MCU of an application device ATMEGA16L. In this code example: ?The MCU is configured ?SCP1000-D01 is initialized and configured ?The high resolution measurement mode is activated ?Temperature and pressure information is read always when the DRDY pin is in high state Please refer to the document "SCP1000 Product Family Specification 8260800" for further information on SCP1000 register addressing and SPI communication. This document applies to the SCP1000-D01.
標簽： communication Technologies objective pressure
上傳時間： 2017-06-17
上傳用戶：youmo81
The FPGA can realize a more optimized Digital controller in DC/DC Converters when compare to DSPs. In this paper, based on the FPGA platform, The theoretical analysis, characteristics, simulation and design consideration are given. The methods to implement the digital DC/DC Converters have been researched. The function module, state machine of digital DC/DC controller and high resolution DPWM with Sigma- Delta dither has been introduced. They are verified by experiments on a 20 W, 300 KHz non-isolated synchronous buck converters.
標簽： Converters controller optimized Digital
上傳時間： 2013-12-31
上傳用戶：tzl1975
In this paper, a new method is introduced to implement chaotic generators based on the Henon map and Lorenz chaotic generators given by the state equations using the Field Programmable Gate Array (FPGA). The aim of this method is to increase the frequency of the chaotic generators. The new method is based on the MATLAB® Software, Xilinx System Generator, Xilinx Alliance tools and Synplicity Synplify.
標簽： introduced generators implement chaotic
上傳時間： 2017-07-24
上傳用戶：qq521
This article discusses some issues that a typical Windows C++ programmer will encounter when approaching Symbian OS for the first time. Our experience in developing for three successive versions of Symbian OS has given us considerable perspective on what can be difficult when working in this otherwise rich and stable environment. While one reason for Symbian s success may be the desire of many mobile phone manufacturers not to be tied to Microsoft, the other reason is that Symbian has put together a lightweight, elegant system that succeeds in providing a very impressive range of functionality. Here are some pointers to help ease the transition to successful Symbian OS application development.
標簽： programmer discusses encounter article
上傳時間： 2017-07-30
上傳用戶：zhaiyanzhong
