1、实验五 MATLAB程序设计实验五 MATLAB程序设计班级:机工1004班 学号:10405701308 姓名:胡健民1实验目的掌握MATLAB程序设计的主要方法,熟练编写MATLAB函数。2实验内容(1)M文件的编辑。(2)程序流程控制结构。(3)子函数调用和参数传递。(4)局部变量和全局变量。3实验步骤1.M文件的编辑选择MATLAB的菜单FileNewM-file,打开新的M文件进行编辑,然后输入以下内容,并保存文件名为exp1.m。 s=0; for n=1:100 s=s+n;end s结果如下: exp1s = 5050保存好文件后,在命令窗口输入exp1即可运行该脚本文件,注意
2、观察变量空间。接着创建M函数文件,然后输入以下内容,并保存文件名为exp2.m。function s=exp2(x) s=0;for n=1:xs=s+n;end保存好文件后,在命令窗口输入 clear s=exp2(100) 2.程序流程控制结构1)for循环结构for n=1:10nend另一种形式的for循环:n=10:-1:5for i=niend2)while循环结构在命令窗口输入:clear,clc;x=1;while 1x=x*2end 将会看到MATLAB进入死循环,因为while 判断的值恒为真,这时须按下Ctrl+C键来中断运行,并且可看到x的值为无穷大。3)if-else
3、-end分支结构 if-else-end分支有如下3种形式。(a) if 表达式 语句组1 end(b) if 表达式 语句组1else 语句组2end(c) if 表达式A 语句组1elseif 表达式B 语句组2elseif 语句组3.else 语句组nend 4)switch-case结构创建M脚本文件exp3.m,输入以下内容并在命令窗口中运行。n=input(n);if isempty(n) error(please input n)endswitch mod(n,2) case 1 A=奇数 case 0 A=偶数end运行结果如下: exp3n 5A =奇数 exp3n 10A
4、=偶数3.子函数和参数传递例:function g=exp4(x)g=0;for n=1:x g=g+fact(n);endfunction y=fact(k) y=1;for i=1:k y=y*i;end输入参数可以由函数nargin计算,下面的例子sinplot2(),当只输入一个参数w时,sinplot2()函数会给p赋予默认值0。function z=sinplot (w,p)if nargin2 error(too many input)endif nargin=1 p=0;endx=linspace(0,2*pi,500)z=sin(x.*w+p);运行结果: sinplotx
5、= Columns 1 through 9 0 0.0126 0.0252 0.0378 0.0504 0.0630 0.0755 0.0881 0.1007 Columns 10 through 18 0.1133 0.1259 0.1385 0.1511 0.1637 0.1763 0.1889 0.2015 0.2141 Columns 19 through 27 0.2266 0.2392 0.2518 0.2644 0.2770 0.2896 0.3022 0.3148 0.3274 Columns 28 through 36 0.3400 0.3526 0.3652 0.3777
6、0.3903 0.4029 0.4155 0.4281 0.4407 Columns 37 through 45 0.4533 0.4659 0.4785 0.4911 0.5037 0.5163 0.5288 0.5414 0.5540 Columns 46 through 54 0.5666 0.5792 0.5918 0.6044 0.6170 0.6296 0.6422 0.6548 0.6674 Columns 55 through 63 0.6799 0.6925 0.7051 0.7177 0.7303 0.7429 0.7555 0.7681 0.7807 Columns 64
7、 through 72 0.7933 0.8059 0.8185 0.8310 0.8436 0.8562 0.8688 0.8814 0.8940 Columns 73 through 81 0.9066 0.9192 0.9318 0.9444 0.9570 0.9695 0.9821 0.9947 1.0073 Columns 82 through 90 1.0199 1.0325 1.0451 1.0577 1.0703 1.0829 1.0955 1.1081 1.1206 Columns 91 through 99 1.1332 1.1458 1.1584 1.1710 1.183
8、6 1.1962 1.2088 1.2214 1.2340 Columns 100 through 108 1.2466 1.2592 1.2717 1.2843 1.2969 1.3095 1.3221 1.3347 1.3473 Columns 109 through 117 1.3599 1.3725 1.3851 1.3977 1.4103 1.4228 1.4354 1.4480 1.4606 Columns 118 through 126 1.4732 1.4858 1.4984 1.5110 1.5236 1.5362 1.5488 1.5614 1.5739 Columns 1
9、27 through 135 1.5865 1.5991 1.6117 1.6243 1.6369 1.6495 1.6621 1.6747 1.6873 Columns 136 through 144 1.6999 1.7125 1.7250 1.7376 1.7502 1.7628 1.7754 1.7880 1.8006 Columns 145 through 153 1.8132 1.8258 1.8384 1.8510 1.8635 1.8761 1.8887 1.9013 1.9139 Columns 154 through 162 1.9265 1.9391 1.9517 1.9
10、643 1.9769 1.9895 2.0021 2.0146 2.0272 Columns 163 through 171 2.0398 2.0524 2.0650 2.0776 2.0902 2.1028 2.1154 2.1280 2.1406 Columns 172 through 180 2.1532 2.1657 2.1783 2.1909 2.2035 2.2161 2.2287 2.2413 2.2539 Columns 181 through 189 2.2665 2.2791 2.2917 2.3043 2.3168 2.3294 2.3420 2.3546 2.3672
11、Columns 190 through 198 2.3798 2.3924 2.4050 2.4176 2.4302 2.4428 2.4554 2.4679 2.4805 Columns 199 through 207 2.4931 2.5057 2.5183 2.5309 2.5435 2.5561 2.5687 2.5813 2.5939 Columns 208 through 216 2.6065 2.6190 2.6316 2.6442 2.6568 2.6694 2.6820 2.6946 2.7072 Columns 217 through 225 2.7198 2.7324 2
12、.7450 2.7576 2.7701 2.7827 2.7953 2.8079 2.8205 Columns 226 through 234 2.8331 2.8457 2.8583 2.8709 2.8835 2.8961 2.9086 2.9212 2.9338 Columns 235 through 243 2.9464 2.9590 2.9716 2.9842 2.9968 3.0094 3.0220 3.0346 3.0472 Columns 244 through 252 3.0597 3.0723 3.0849 3.0975 3.1101 3.1227 3.1353 3.147
13、9 3.1605 Columns 253 through 261 3.1731 3.1857 3.1983 3.2108 3.2234 3.2360 3.2486 3.2612 3.2738 Columns 262 through 270 3.2864 3.2990 3.3116 3.3242 3.3368 3.3494 3.3619 3.3745 3.3871 Columns 271 through 279 3.3997 3.4123 3.4249 3.4375 3.4501 3.4627 3.4753 3.4879 3.5005 Columns 280 through 288 3.5130
14、 3.5256 3.5382 3.5508 3.5634 3.5760 3.5886 3.6012 3.6138 Columns 289 through 297 3.6264 3.6390 3.6516 3.6641 3.6767 3.6893 3.7019 3.7145 3.7271 Columns 298 through 306 3.7397 3.7523 3.7649 3.7775 3.7901 3.8026 3.8152 3.8278 3.8404 Columns 307 through 315 3.8530 3.8656 3.8782 3.8908 3.9034 3.9160 3.9
15、286 3.9412 3.9537 Columns 316 through 324 3.9663 3.9789 3.9915 4.0041 4.0167 4.0293 4.0419 4.0545 4.0671 Columns 325 through 333 4.0797 4.0923 4.1048 4.1174 4.1300 4.1426 4.1552 4.1678 4.1804 Columns 334 through 342 4.1930 4.2056 4.2182 4.2308 4.2434 4.2559 4.2685 4.2811 4.2937 Columns 343 through 351 4.3063 4.3189 4.3315 4.3441 4.3567 4.3
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