Matlab基础题总结和习题提示
【摘要】 安装与使用说明：https://blog.csdn.net/zhangrelay/article/details/79622079
网页版本：https://blog.csdn.net/zhangrelay/article/details/79529824
浓缩指令备忘录和习题提示：
下载链接：：https://share.weiyun.com/5XlV19a 密码：ebu...
安装与使用说明：https://blog.csdn.net/zhangrelay/article/details/79622079
网页版本：https://blog.csdn.net/zhangrelay/article/details/79529824
浓缩指令备忘录和习题提示：
下载链接：：https://share.weiyun.com/5XlV19a 密码：ebu4qp
推荐使用新版Matlab，如2017a、2017b等。
中文论坛：http://www.ilovematlab.cn/forum.php
帮助文档：http://cn.mathworks.com/help/
对应实验1到实验8：
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Matlab习题提示：
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实验1：
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%1.1
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clc;
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%1.2
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x0=10;v0=15;a=-9.84;t=5;
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x=x0+v0*t+0.5*a*t.^2;
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disp(x)
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%1.3 ln log() log log10() 180 = pi x.*x x*x
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z1=2*sin(pi*85/180)/(1+exp(2))
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x=[2 1+2i;-0.45 5]
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z2=0.5*log(x+sqrt(1+x^2))
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t=0:0.5:2.5
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z3=(t>=0&t<1).*(t.^2)+(t>=1&t<2).*(t.^2-1)+(t>=2&t<3).*(t.^2-2*t+1)
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%1.4 plot()
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x=0:0.1:10;
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y=2*exp(-0.2*x);
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plot(x,y);
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%1.5 exa1 exa2 exa8....
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实验2：
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%zeros(n)... linspace(1,5,5)... logspace(1,5,5.5)...A[] A()...A.*B
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%A*B...rank()...eig(A)...det(A)
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%2.1
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%2.2
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%2.3 x=A\B A*x=B
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%2.4
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randn(6,6)
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%2.5 help rand ...
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rand('state',0)
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a=rand(2,2)
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s1=num2str(a)
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ss=sprintf('%.10e\n',a)
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fprint('%.5g\\',a)
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s_sscan=sscanf(ss,'%f',[3,2])
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%2.6
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%2.7 P=UI=I2R linspace
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Rs=linspace(50,50,1001);Vs=linspace(120,120,1001);
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Rl=0:0.1:100;
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Il=Vs./(Rs+Rl);
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Pl=(Il.*Il).*Rl;
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[Plmax,Rlnum]=max(Pl)
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plot(Rl,Pl)
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实验3：
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%plot(),subplot(),figure(),hold on,bar(),
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%area(),pie(),hist(),stem(),stairs,plot3(),
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%mesh(),surf(),view(),
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%3.1 %3.2 %3.3%3.4%3.5%3.6%Q
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x=-10:0.1:10;
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y=sqrt((64-x.*x)/2.0);
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y1=-sqrt((64-x.*x)/2.0);
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plot(x,y);
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hold on;
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plot(x,y1);
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t=-10:0.1:10;
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x=sin(t);
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y=cos(t);
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plot(x,y);
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y=sin(x.^-1);
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plot(x,y);
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fplot(x,y); %error
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function Y = myfun(x)
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Y(:,1) = x(:);
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Y(:,2) = sin(x(:).^-1);
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fh = @myfun;
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fplot(fh,[-2 2])
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x=-3:0.1:3;
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y=-3:0.1:3;
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[X,Y]=meshgrid(x,y);
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Z=-X.^2+Y.^2;
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figure(1);
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mesh(X,Y,Z);
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figure(2);
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surf(X,Y,Z);
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a=1;
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x=a*sin(t);
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y=sqrt(25-a^2)*cos(t);
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subplot(2,2,1)
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plot(x,y);
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a=2;
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x=a*sin(t);
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y=sqrt(25-a^2)*cos(t);
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subplot(2,2,2)
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plot(x,y);
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a=3;
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x=a*sin(t);
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y=sqrt(25-a^2)*cos(t);
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subplot(2,2,3)
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plot(x,y);
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a=4;
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x=a*sin(t);
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y=sqrt(25-a^2)*cos(t);
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subplot(2,2,4)
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plot(x,y);
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实验4：
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4.1 注意syms x y 与 x=sym('6'); 具体过程如下：
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syms x y;
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x=sym('6');
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y=sym('5');
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sprintf('z符号表达式求解结果为：')
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z=(x+1)/(sqrt(3+x)-sqrt(y))
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4.2 factor() 参考例题即可
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4.3 simple() 具体示例如下：
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syms p1 p2 x
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F=sin(p1)*cos(p2)-cos(p1)*sin(p2)
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sprintf('F化简结果为')
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f=simple(F)
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G=(4*x^2+8*x+3)/(2*x+1)
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sprintf('G化简结果为')
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g=simple(G)
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syms x;
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f=x^6+1;
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s=factor(f)
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syms x;
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f=x^2-1;
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s=factor(f)
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syms h n x;
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L=limit((log(x+h)-log(x))/h,h,0)
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M=limit((1-x)/n^n,n,inf)
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N=limit((1-x/n)^n,n,inf)
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syms a x;
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y=sin(a*x);
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A=diff(y,x)
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B=diff(y,a)
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C=diff(y,x,2)
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syms n;
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S=symsum(1/n^2,1,inf)
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S1=symsum(1/n^2,1,10)
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S2=symsum(n,1,100)
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syms x;
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f=x*sin(x);
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F=fourier(f)
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syms x y;
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x=sym('6');
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y=sym('5');
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z=(x+1)/(sqrt(3+x)-sqrt(y))
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syms x1 x2;
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f=sin(x1)*cos(x2)-cos(x1)*sin(x2);
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p=simple(f)
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syms x y;
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f=x^4-y^4;
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s=factor(f)
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syms x1 x2;
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syms p1 p2 x
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F=sin(p1)*cos(p2)-cos(p1)*sin(p2)
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sprintf('F化简结果为')
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f=simple(F)
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G=(4*x^2+8*x+3)/(2*x+1)
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sprintf('G化简结果为')
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g=simple(G)
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syms x y;
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x=sym('6');
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y=sym('5');
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sprintf('z符号表达式求解结果为：')
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z=(x+1)/(sqrt(3+x)-sqrt(y))
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实验5：选择结构（if else）示例有错误。
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5.1 if else习题
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word=input('请输入一个字符，','s')
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if word>='A'&word<='Z'
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sprintf('是大写字母啊!!!')
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char(word+1)
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elseif word>='a'&word<='z'
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sprintf('是小写字母啊!!!')
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char(word-1)
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elseif word>='1'&word<='9'
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sprintf('是数字啊!!!')
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char(word)
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else
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sprintf('都是些什么啊!!!')
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char(word)
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end
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5.2 switch case习题
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word=input('请输入字符串，','s')
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switch word
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case 'Monday'
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disp('1')
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case 'Sunday'
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disp('7')
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case 'Happy'
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disp('666')
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otherwise
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disp('Unknown')
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end
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5.3 参考如下：
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A=[2 2 2;3 4 3];B=[1 2;3 2;6 6];
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try
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sprintf('1')
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C=A*B
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catch
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sprintf('2')
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C=A.*B
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end
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5.4
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a=20;b=-2;c=0;d=1;
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disp('a>b'),a>b
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disp('b>d'),b>d
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disp('a>b&c>d'),a>b&c>d
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disp('a==b'),a==b
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disp('a&b>c'),a&b>c
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disp('~~b'),~~b
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5.5 类似5.4
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思考题
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s=0;
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a=2;
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b=1;
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t=0;
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for i=1:16
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s=s+a./b;
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t=a;
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a=a+b;
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b=t;
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end
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s
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实验六
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具体参考指导书
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实验七
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效果图：
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代码（请慎重使用全局变量）：
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function varargout = ex7gui(varargin)
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% EX7GUI M-file for ex7gui.fig
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% EX7GUI, by itself, creates a new EX7GUI or raises the existing
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% singleton*.
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%
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% H = EX7GUI returns the handle to a new EX7GUI or the handle to
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% the existing singleton*.
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%
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% EX7GUI('CALLBACK',hObject,eventData,handles,...) calls the local
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% function named CALLBACK in EX7GUI.M with the given input arguments.
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%
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% EX7GUI('Property','Value',...) creates a new EX7GUI or raises the
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% existing singleton*. Starting from the left, property value pairs are
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% applied to the GUI before ex7gui_OpeningFunction gets called. An
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% unrecognized property name or invalid value makes property application
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% stop. All inputs are passed to ex7gui_OpeningFcn via varargin.
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%
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% *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one
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% instance to run (singleton)".
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%
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% See also: GUIDE, GUIDATA, GUIHANDLES
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% Copyright 2002-2003 The MathWorks, Inc.
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% Edit the above text to modify the response to help ex7gui
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% Last Modified by GUIDE v2.5 28-Mar-2018 14:02:01
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% Begin initialization code - DO NOT EDIT
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gui_Singleton = 1;
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gui_State = struct('gui_Name', mfilename, ...
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'gui_Singleton', gui_Singleton, ...
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'gui_OpeningFcn', @ex7gui_OpeningFcn, ...
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'gui_OutputFcn', @ex7gui_OutputFcn, ...
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'gui_LayoutFcn', [] , ...
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'gui_Callback', []);
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if nargin && ischar(varargin{1})
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gui_State.gui_Callback = str2func(varargin{1});
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end
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if nargout
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[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
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else
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gui_mainfcn(gui_State, varargin{:});
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end
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% End initialization code - DO NOT EDIT
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% --- Executes just before ex7gui is made visible.
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function ex7gui_OpeningFcn(hObject, eventdata, handles, varargin)
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% This function has no output args, see OutputFcn.
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% hObject handle to figure
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% eventdata reserved - to be defined in a future version of MATLAB
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% handles structure with handles and user data (see GUIDATA)
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% varargin command line arguments to ex7gui (see VARARGIN)
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% Choose default command line output for ex7gui
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handles.output = hObject;
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global BB;
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% Update handles structure
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guidata(hObject, handles);
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% UIWAIT makes ex7gui wait for user response (see UIRESUME)
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% uiwait(handles.figure1);
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% --- Outputs from this function are returned to the command line.
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function varargout = ex7gui_OutputFcn(hObject, eventdata, handles)
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% varargout cell array for returning output args (see VARARGOUT);
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% hObject handle to figure
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% eventdata reserved - to be defined in a future version of MATLAB
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% handles structure with handles and user data (see GUIDATA)
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% Get default command line output from handles structure
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varargout{1} = handles.output;
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% --- Executes on button press in pushbutton1.
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function pushbutton1_Callback(hObject, eventdata, handles)
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% hObject handle to pushbutton1 (see GCBO)
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% eventdata reserved - to be defined in a future version of MATLAB
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% handles structure with handles and user data (see GUIDATA)
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%figure(1);
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AA = str2double(get(handles.edit1,'String'));
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global BB
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x=-10:0.1:10;
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%plot(x,sin(x)+cos(x)+x)
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line(x,AA*(sin(BB*x)+cos(BB*x))+x)
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% --- Executes on button press in pushbutton2.
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function pushbutton2_Callback(hObject, eventdata, handles)
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% hObject handle to pushbutton2 (see GCBO)
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% eventdata reserved - to be defined in a future version of MATLAB
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% handles structure with handles and user data (see GUIDATA)
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cla;
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% --- Executes on button press in pushbutton3.
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function pushbutton3_Callback(hObject, eventdata, handles)
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% hObject handle to pushbutton3 (see GCBO)
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% eventdata reserved - to be defined in a future version of MATLAB
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% handles structure with handles and user data (see GUIDATA)
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function edit1_Callback(hObject, eventdata, handles)
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% hObject handle to edit1 (see GCBO)
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% eventdata reserved - to be defined in a future version of MATLAB
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% handles structure with handles and user data (see GUIDATA)
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% Hints: get(hObject,'String') returns contents of edit1 as text
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% str2double(get(hObject,'String')) returns contents of edit1 as a double
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%AA = str2double(get(hObject,'String'))
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% --- Executes during object creation, after setting all properties.
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function edit1_CreateFcn(hObject, eventdata, handles)
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% hObject handle to edit1 (see GCBO)
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% eventdata reserved - to be defined in a future version of MATLAB
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% handles empty - handles not created until after all CreateFcns called
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% Hint: edit controls usually have a white background on Windows.
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% See ISPC and COMPUTER.
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if ispc
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set(hObject,'BackgroundColor','white');
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else
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set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
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end
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% --- Executes on button press in radiobutton1.
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function radiobutton1_Callback(hObject, eventdata, handles)
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% hObject handle to radiobutton1 (see GCBO)
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% eventdata reserved - to be defined in a future version of MATLAB
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% handles structure with handles and user data (see GUIDATA)
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% Hint: get(hObject,'Value') returns toggle state of radiobutton1
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if get(hObject,'Value')
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grid on;
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else
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grid off;
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end
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% --- Executes on slider movement.
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function slider2_Callback(hObject, eventdata, handles)
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% hObject handle to slider2 (see GCBO)
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% eventdata reserved - to be defined in a future version of MATLAB
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% handles structure with handles and user data (see GUIDATA)
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% Hints: get(hObject,'Value') returns position of slider
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% get(hObject,'Min') and get(hObject,'Max') to determine range of slider
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global BB
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BB=50*get(hObject,'Value')+1
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% --- Executes during object creation, after setting all properties.
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function slider2_CreateFcn(hObject, eventdata, handles)
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% hObject handle to slider2 (see GCBO)
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% eventdata reserved - to be defined in a future version of MATLAB
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% handles empty - handles not created until after all CreateFcns called
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% Hint: slider controls usually have a light gray background, change
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% 'usewhitebg' to 0 to use default. See ISPC and COMPUTER.
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usewhitebg = 1;
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if usewhitebg
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set(hObject,'BackgroundColor',[.9 .9 .9]);
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else
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set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
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end
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--
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实验八：
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simulink
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注意模块一定要确保准确，参数正确。
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----~~~~----
文章来源: zhangrelay.blog.csdn.net，作者：zhangrelay，版权归原作者所有，如需转载，请联系作者。
原文链接：zhangrelay.blog.csdn.net/article/details/79729736
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