# MATLAB应用之愚见(重庆大学研究生总结,很精彩~~)

2009-6-22 13:40 t T#1

1. 矩阵运算及“计算器”

2. 绘图功能

Matlab可以对数据进行插值或拟合处理，其中专门提供了曲线拟合工具箱，可以实现不同函数不同类型的数据拟合。估计很多人仍然在使用excel进行数据处理及出图操作，在此我并不否认excel的强大功能，但采用matlab可以显著提高图形可读性及自定义性。

Preparation of Electronic Figures for Publication: Although low quality images are adequate for review purposes, print publication requires high quality images to prevent the final product being blurred or fuzzy. Submit EPS (lineart) or TIFF (halftone/photographs) files only. MS PowerPoint and Word Graphics are unsuitable for printed pictures. Do not use pixel-oriented programmes. Scans (TIFF only) should have a resolution of 300 dpi (halftone) or 600 to 1200 dpi (line drawings) in relation to the reproduction size (see below). Please submit the data for figures in black and white or submit a colourwork agreement form. EPS files should be saved with fonts embedded (and with a TIFF preview if possible).

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Further information can be obtained at Blackwell Publishing\'s guidelines for figures: http://www.wendangku.net/doc/f35bdda6f524ccbff1218441.html/bauthor/illustration.asp

http://www.wendangku.net/doc/f35bdda6f524ccbff1218441.html/topic_show.php?tid=578733

3. matlab的帮助文件一定要利用起来。里面有基本涵盖matlab应用所有方面的例子。比如说FFT，自己冥思苦想的程序实现起来并不如demo中提供的寥寥数句程序好使。又比如里面的差分方程的求解实例无疑对数值分析课程的实践起到有效的借鉴意义。

4. 优化

The large-scale algorithm is a subspace trust region method and is based on the interior-reflective Newton method described in [1] and [2]. Each iteration involves the approximate solution of a large linear system using the method of preconditioned conjugate gradients (PCG)..

Medium-Scale Optimization

fmincon uses a sequential quadratic programming (SQP) method. In this method, the function solves a quadratic programming (QP) subproblem at each iteration. An estimate of the Hessian of the Lagrangian is updated at each iteration using the BFGS formula. A line search is performed The QP subproblem is solved using an active set strategy.

1.什么Large-Scale Optimization，什么是Medium-Scale Optimization？

3.BFGS公式和线性搜索是什么？

Q(x) = 1/2* +

BFGS公式如下：

H(k+1) = H(k) + / - /

fmincon运行首先检查有无梯度表达提供，如有则选则大规模算法（subspace trust region），由此涉及到Hessian阵的近似计算，由于已提供了梯度的公式，则Hessian阵可以直接通过有限差分计算。但是如果用户直接提供了Hessian计算公式，则直接计算。

http://www.wendangku.net/doc/f35bdda6f524ccbff1218441.html/herry_jelly/ ... 7d03f2af5133d6.html

6. 信号处理

7. 上述所窥只是matlab的冰山一角。其它如图像处理、混合编程、GUI设计等内容远超越本人理解能力范围，在此不做叙述，还请高手前来指点。越接触matlab越发现它的能力越大，也越没信心学好它。然虽如此，随着不断的操作和尝试，自身对matlab的驾驭总会越加娴熟。希望朋友们能跨进matlab之门，领了matlab在科研工作中体现出的无穷魅力

tT #6

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sqj1199 tT #15

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huaijuliu

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2009-7-10 11:49

tT #17

huaijuliu wrote:

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huaijuliu tT #18

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2009-7-11 13:31

tT #19

huaijuliu wrote: