1、axis equal纵、横坐标轴采用等长刻度text(1,2,y=sin(x)在x=1,y=2处加上字符串y=sin(x);hold on把新的plot产生的图形画在原来的图形上。title(y=sin(x)在图形正上方加上字符串y=sin(x)16、Matlab中自定义函数M文件的第一行必须以function开头;17、二种数值积分的库函数名为:quad;quadl18、unifrnd(1,2,3,4)的功能是:随机生成3行4列均匀分布,每个元素服从(1,2)的矩阵19、binornd(20,0.3,3,4)的功能是随机生成3行4列服从(20,0.3)的二项分布的矩阵20、eig(A)的功能
2、是矩阵A的特征值21、设x是一向量,则hist(x)的功能是作出将X十等分的直方图22、interp1(1,2,3,3,4,5,2.5)Ans=4.523、建立一阶微分方程组的函数M文件。(做不出来)二、写出运行结果:1、eye(3,4)=2、size(1,2,3)=1;33、设b=round(unifrnd(-5,5,1,4),则=3 5 2 -5x,m=min(b);x=-5;m=4,x,n=sort(b)-5 2 3 54 3 1 2mean(b)=1.25,median(b)=2.5,range(b)=104、向量b如上题,则any(b),all(b2),all(b5 6;7 87 8
3、;5 6=6、若,则7、diag(diag(B)=8、4:-2:1.*-1,6=-4 129、acos(0.5),atan(1)ans=.0471*0.78539816339744810、norm(1,2,3)Ans=3.74165738677394111、length(1,3,-1)=312、x=0:0.4:2;plot(x,2*x,k*)13、zeros(3,1);14、ones(3)=,vander(2,3,5)=16、floor(1:0.3:3)=1 1 1 1 2 2 218、subplot(2,2,1); fplot(sin,0,2*pi);subplot(2,2,2);plot(
4、1,2,-1);x=linspace(0,6*pi);subplot(2,2,3);plot3(cos(x),sin(x),x);subplot(2,2,4);polar(x,5*sin(4*x/3);19、t=linespace(0,2,11)0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.020、a,b=binostat(15,0.2)a=3 b=2.4y1=binopdf(5,10,0.7)=0.1029,y2=binocdf(5,10,0.7)=0.150321、log10(1,10,100)=0 1 222、p=1;for k=2:3:9 p=p*
5、k;end;p p=8023、s=0;9 s=s+k;s s=1524、Ans=3.864725、a1=norminv(0.6,3,4)a1=4.013426、unifinv(0.4,1,5),unifpdf(0.4,1,5),unifpdf(2,1,5)Ans=2.6 0 0.2527、A=0 1-1;2 1 0;1-1 1;0 1 -11 -1 1A(1,3,:)A(3,1,:)=1 -1 1 0 1 -1A(2,:)=2 1 0-2*A(1,:)= 0 -2 228、quad(sin(x),0,pi/2)=1.000029、trapz(3,4,6,1,2,3)=6.500030、 int
6、(x-sin(x),0,1)Ans=cos(1) - 1/231、round(3:5),ceil(3:5);floor(3:5)3 3 4 4 5 53 3 3 4 4 5limit(1+1/(3*x)x,inf)=1diff(sin(3*x)+x3,2)=6*x-9*sin(3*x) taylor(exp(3*x),5,1):命令输入: y=taylor(exp(3*x),x,1,Order,5) exp(3) + 3*exp(3)*(x - 1) + (9*exp(3)*(x - 1)2)/2 + (9*exp(3)*(x - 1)3)/2 + (27*exp(3)*(x - 1)4)/8
7、a1=mod(15,4),b1=rem(15,4)=3,3a2=mod(-15,-4),b2=rem(-15,-4)=-3,-3a3=mod(15,-4),b3=rem(15,-4)=-1,-3a4=mod(-15,4),b4=rem(-15,4)=1,-334、x=binornd(20,0.4,2,4)8 7 10 810 7 9 12sign(x),1 1 1 1y=-poissrnd(8,2,4)-16 -10 8 -7-7 -8 -6 -9sign(y)-1 -1 -1 -135、a1,b1=binostat(20,0.4) a1=8 b1=4.8a2,b2=poisstat(8)an
8、s=8,8a3,b3=chi2stat(15)ans=15 3036、运行M文件:chi2fign=5;a=0.9;xa=chi2inv(a,n);0.1:15;y=chi2pdf(x,n);plot(x,y,b);hold on;xf=0:xa;yf=chi2pdf(xf,n);fill(xf,xa,yf,0,gtext(xa*1.01,0.005,num2str(xa);text(2.5,0.05,alpha=0.9,fontsize,20);text(9,0.09,Xchi2(4),16);37、t=linspace(0,2*pi);polar(t,3*t,g*)38、quadl(exp
9、(2*x).*log(3*x),1,3)ans = 398.635239、x0=0:2*pi/6:2*pi;y0=sin(x0).*cos(x0);x=linspace(0,2*pi,100);y=sin(x).*cos(x);y1=spline(x0,y0,x);x;y;y1k,x,y1,b-注:此处省略100组数据40、A=round(unifrnd(0,100,3,3);L,U=lu(A)L = 0.9897 0.4699 1.0000 0.1649 1.0000 0 1.0000 0 0U = 97.0000 80.0000 92.0000 0 35.8041 26.8247 0 0
10、-89.656841、a=sparse(1 3 3,2 3 5,1 2 3,4,5);s=full(a)s = 0 1 0 0 0 0 0 0 0 0 0 0 2 0 3三、编程1、分别用矩形公式、梯形公式、辛普森公式、Gauss-Lobatto公式及随机模拟方法计算数值积分,并与符号运算计算的结果进行比较。format long0.01:pi/2;y=exp(3*x).*sin(2*x);s1=sum(y)*0.01;s2=trapz(x,y);s3=quad(exp(3*x).*sin(2*x),0,pi/2);s4=quadl(n=10000;x=unifrnd(0,pi/2,1,n);
11、y=unifrnd(0,exp(5.5),1,n);k=0;for i=1:n if y(i)=exp(3*x(i).*sin(2*x(i) k=k+1; endends5=k/n*pi/2*exp(5.5);syms xs=int(exp(3*x).*sin(2*x),0,pi/2);s6=double(s);s1,s2,s3,s4,s5,s6 输出结果: Columns 1 through 3 17.278609048277868 17.277724710546092 17.279658142557587 Columns 4 through 6 17.279658229217087 17.219381240184841 17.2796582292086502、用雅可比迭代求解线性方程组,其中随机取。要求使用函数型M文件,并有对其迭代格式的收敛性进行判断的功能。雅可比迭代M文件;function x,m=yakebi(A,b,x0,to
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