地震工程課2016concise course on matlab learning

1、2011/4/26Matlab and its learning1Matlab and its learningMATLABis an interactive system for numericalcomputation. Numerical analyst Cleve Moler wrote the initial Fortran version of MATLAB in the late 1970s as a teaching aid. It became popular for both teaching and research and evolved into a commerci

2、al software package written in C. For many years now, MATLAB has been widely used in universities and industry.MATLAB has several advantages over more traditional means of numerical computing (e.g., writing Fortran or C programs and calling numerical libraries):It allows quick and easy coding in a v

3、ery high-level language.Data structures require minimal attention; in particular, arrays need not be declared before first use.1.2.Matlab and its learning3.An interactive interface allows rapid experimentation and easy debugging.High-quality graphics and visualization facilities are available.MATLAB

4、 M-files are completely portable across a wide range of platforms.Toolboxes can be added to extend the system, giving, for example, specialized signal processing facilities and a symbolic manipulation capability.A wide range of user-contributed M-files is freely available on the Internet.Being inter

5、preted, MATLAB inevitably suffers some loss of efficiency compared with compiled languages, but built-in performance acceleration techniques reduce the inefficiencies and users have the possibility of linking to compiled Fortran or C code using MEX files.Matlab and its learning4.5.6.7.Matlab and its

6、 learningMatlab and its learningMatlab and its learning采用命令可以查找不太準(zhǔn)確知道的命令 在鍵入前幾個(gè)字符后 鍵入健 則顯示出一系列選擇 然后可用查找在存儲(chǔ)一個(gè)新函數(shù)或者程序前，應(yīng)先檢查一下 是否和以前的重名，可用 。好的編程習(xí)慣是給出用途和怎樣使用的例子，在等號(hào)前后留空格，一行一句，矩陣變 量大寫。另一個(gè)是常用的變量較短一點(diǎn)，常量和較少用變量名字長(zhǎng)一點(diǎn)。 Matlab and its learning編程的一些提高速度的技巧，向量化，少用等循環(huán)。， 先預(yù)設(shè)分配變量，矩陣存儲(chǔ)大小，避免每次長(zhǎng)度增加重新分配。 取有效數(shù)字位數(shù)的函數(shù)為可以保留不同位數(shù)的有效數(shù)字。加噪音的方法Matlab and its learning 函數(shù)時(shí)的一些參數(shù)，在的運(yùn)行條件。 可以查看調(diào)用版中可以設(shè)置停止程序運(yùn)行占用的時(shí)間分別 。利用可以去除坐標(biāo)軸的用于表示獲得當(dāng)前的Matlab and its learning也有類似的可用于優(yōu)功能，列出內(nèi)存中曾經(jīng)運(yùn)行的文件?；募阅?，考察個(gè)變量的運(yùn)算時(shí)間。