实验一MATLAB运算基础

实验一MATLAB运算基础一．实验目的1.熟悉启动和退出MATLAB的方法2.熟悉MATLAB命令窗口的组成。3.掌握建立矩阵的方法。4.掌握MATLAB各种表达式的书写规则以及常用函数的使用。二．实验内容1.先求下列表达式的值，然后显示MATLAB工作空间的使用情况并保存全部变量。1、（1）z1=(2*sin(85*pi/180))/(1+exp(2))z1=2*sin(85*pi/180)/(1+exp(2))z1=0.2375（2）x=[21+2*i;-0.455];z2=1/2*log(x+sqrt(1+x))x=[2,1+2i;-0.45,5];z2=1/2*log(x+sqrt(1+x^2))z2=0.7114-0.0253i0.8968+0.3658i0.2139+0.9343i1.1541-0.0044i（3）a=-3:0.1:3;z3=(exp(0.3.*a)-exp(-0.3.*a))/2.*sin(a+0.3)+log((a+0.3)/2)a=-3:0.1:3;z3=(exp(0.3.*a)-exp(-0.3.*a))/2.*sin(a+0.3)+log((a+0.3)/2)z3=Columns1through40.7388+3.1416i0.7696+3.1416i0.7871+3.1416i0.7913+3.1416iColumns5through80.7822+3.1416i0.7602+3.1416i0.7254+3.1416i0.6784+3.1416iColumns9through120.6196+3.1416i0.5496+3.1416i0.4688+3.1416i0.3780+3.1416iColumns13through160.2775+3.1416i0.1680+3.1416i0.0497+3.1416i-0.0771+3.1416iColumns17through20-0.2124+3.1416i-0.3566+3.1416i-0.5104+3.1416i-0.6752+3.1416iColumns21through24-0.8536+3.1416i-1.0497+3.1416i-1.2701+3.1416i-1.5271+3.1416iColumns25through28-1.8436+3.1416i-2.2727+3.1416i-2.9837+3.1416i-37.0245+0.0000iColumns29through32-3.0017+0.0000i-2.3085+0.0000i-1.8971+0.0000i-1.5978+0.0000iColumns33through36-1.3575+0.0000i-1.1531+0.0000i-0.9723+0.0000i-0.8083+0.0000iColumns37through40-0.6567+0.0000i-0.5151+0.0000i-0.3819+0.0000i-0.2561+0.0000iColumns41through44-0.1374+0.0000i-0.0255+0.0000i0.0792+0.0000i0.1766+0.0000iColumns45through480.2663+0.0000i0.3478+0.0000i0.4206+0.0000i0.4841+0.0000iColumns49through520.5379+0.0000i0.5815+0.0000i0.6145+0.0000i0.6366+0.0000iColumns53through560.6474+0.0000i0.6470+0.0000i0.6351+0.0000i0.6119+0.0000iColumns57through600.5777+0.0000i0.5327+0.0000i0.4774+0.0000i0.4126+0.0000iColumn610.3388+0.0000i(4)t=0:0.5:2.5;z1=t.^2.*(t>=0&t<1);z2=(t.^2-1).*(t>=1&t<2);z3=(t.^2-2.*t+1).*(t>=2&t<3);z4=z1+z2+z3z4=00.250001.25001.00002.25002、(1)A+6*B和A-B+I（其中I为单位矩阵）。A=[12,34,-4;34,7,87;3,65,7];B=[1,3,-1;2,0,3;3,-2,7];m=A+6*Bm=1852-10467105215349A=[12,34,-4;34,7,87;3,65,7];B=[1,3,-1;2,0,3;3,-2,7];I=eye(3);n=A-B+In=1231-3328840671(2)A*B和A.*B.A=[12,34,-4;34,7,87;3,65,7];B=[1,3,-1;2,0,3;3,-2,7];m=A*Bm=684462309-72596154-5241A=[12,34,-4;34,7,87;3,65,7];B=[1,3,-1;2,0,3;3,-2,7];n=A.*Bn=1210246802619-13049A^3和A.^3.A=[12,34,-4;34,7,87;3,65,7];B=[1,3,-1;2,0,3;3,-2,7];n=A^3n=372262338244860424737014918860076678688454142118820A=[12,34,-4;34,7,87;3,65,7];B=[1,3,-1;2,0,3;3,-2,7];m=A.^3m=172839304-643930434365850327274625343A/B和B\A.A=[12,34,-4;34,7,87;3,65,7];B=[1,3,-1;2,0,3;3,-2,7];n=A/Bn=16.4000-13.60007.600035.8000-76.200050.200067.0000-134.000068.0000A=[12,34,-4;34,7,87;3,65,7];B=[1,3,-1;2,0,3;3,-2,7];m=B\Am=109.4000-131.2000322.8000-53.000085.0000-171.0000-61.600089.8000-186.2000[A,B]和[A(1,3),：);B^2].A=[12,34,-4;34,7,87;3,65,7];B=[1,3,-1;2,0,3;3,-2,7];n=[A,B]n=1234-413-13478720336573-27A=[12,34,-4;34,7,87;3,65,7];B=[1,3,-1;2,0,3;3,-2,7];m=[A([1,3],:);B^2]m=1234-436574511101920-5403、(1)A=[1,2,3,4,5;6,7,8,9,10;11,12,13,14,15;16,17,18,19,20;21,22,23,24,25];B=[3,0,16;17,-6,9;0,23,-4;9,7,0;4,13,11];C=A*BC=9315077258335237423520397588705557753890717D=[588,705,557;753,890,717](3)a=100:1:999;b=(rem(a,21)==0);c=find(b);d=length(c)d=43(4)a='WelCOmE234575';b=find(a>='A'&a<='Z');a(b)=[]a=elm234575ＭＡＴＬＡＢ实验报告班级：测绘八班姓名：石雨濛学号：２０１４３０１６１０００８实验目的掌握绘制二维图形的常用函数。掌握绘制三维图形的常用函数。掌握绘制图形的辅助操作。实验内容１.x=0:pi/50:2*pi;y=(0.5+3*sin(x)/(1+x.*x)).*cos(x);plot(x,y)２.（１）在同一坐标系下用不同的颜色和线型绘制三条曲线。y1=x.^2;y2=cos(2*x);y3=y1.*y2;plot(x,y1,'b-',x,y2,'g:',x,y3,'r--')（２）以子图形式绘制三条曲线y1=x.^2;y2=cos(2*x);y3=y1.*y2;subplot(1,3,1);plot(x,y1);title('x.^2');subplot(1,3,2);plot(x,y2);title('cos(2*x)');subplot(1,3,3);plot(x,y3);title('y1.*y2');（３）分别用条形图、阶梯图、杆图和填充图绘制三条曲线。y1=x.^2;y2=cos(2*x);y3=y1.*y2;subplot(4,3,1);bar(x,y1,'b');title('bar(x,y1,"b")');subplot(4,3,2);bar(x,y2,'r');title('bar(x,y2,"r")');subplot(4,3,3);bar(x,y3,'y');title('bar(x,y3,"y")');subplot(4,3,4);stairs(x,y1,'b');title('stairs(x,y1,"b")');subplot(4,3,5);stairs(x,y2,'r');title('stairs(x,y2,"r")');subplot(4,3,6);stairs(x,y3,'y');title('stairs(x,y3,"y")');subplot(4,3,7);stem(x,y1,'b');title('stem(x,y1,"b")');subplot(4,3,8);stem(x,y2,'r');title('stem(x,y2,"r")');subplot(4,3,9);stem(x,y3,'y');title('stem(x,y3,"y")');subplot(4,3,10);fill(x,y1,'b');title('fill(x,y1,"b")');subplot(4,3,11);fill(x,y2,'r');title('fill(x,y2,"r")');subplot(4,3,12);fill(x,y3,'y');title('fill(x,y3,"y")');３.x=linspace(-5,5,100);y=[];forx0=xifx0<=0y=[y,(x0+sqrt(pi))/exp(2)];elsey=[y,0.5*log(x0+sqrt(1+x0.^2))];endendplot(x,y);绘制函数的曲面图和等高线。x=linspace(-5,5,21);y=linspace(0,10,31);[x,y]=meshgrid(x,y);z=cos(x).*cos(y).*exp(-sqrt(x.^2+y.^2)/4);subplot(2,1,1);surf(x,y,z);subplot(2,1,2);contour3(x,y,z,30);绘制曲面图形，并进行差值着色处理。s=0:pi/300:pi/2;t=0:pi/100:3*pi/2;x=cos(s).*cos(t);y=cos(s).*sin(t);z=sin(s);plot3(x,y,z);shadingflat;1、m=input(‘请输入成绩’);ifm>=’90’&m<’100’disp(‘A’);elseifm>=’80’&m<’90’disp(‘B’);elseifm>=’70’&<’80’disp(‘C’);elseifm>=’60’&m<’70’disp(‘D’);elseifm>=’0’&m<’60’disp(‘E’);elsedisp(‘输入有误’）endm=input(‘请输入成绩’);switchfix(m/10)case{9,10}di