Matlab上机实验答案.docx

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1、Matlab上机实验答案实验一MATLAB运算基础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)>>z1=2*sin(85*pi/180)/(1+exp(2))z1=0.2375(2)，其中>>x=[21+2i;-0.455];>>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=-3.0:0.1:3.0;>>z3=(exp(0.3.*a)-exp(-0.3.*a))./2.*si

2、n(a+0.3)+log((0.3+a)./2)(>>z33=(exp(0.3*a)-exp(-0.3*a))/2.*sin(a+0.3)+log((0.3+a)/2)可以验证z3==z33，是否都为1）z3=Columns1through50.7388+3.1416i0.7696+3.1416i0.7871+3.1416i0.7913+3.1416i0.7822+3.1416iColumns6through100.7602+3.1416i0.7254+3.1416i0.6784+3.1416i0.6196+3.1416i0.5496+3.1416

3、iColumns11through150.4688+3.1416i0.3780+3.1416i0.2775+3.1416i0.1680+3.1416i0.0497+3.1416iColumns16through20-0.0771+3.1416i-0.2124+3.1416i-0.3566+3.1416i-0.5104+3.1416i-0.6752+3.1416iColumns21through25-0.8536+3.1416i-1.0497+3.1416i-1.2701+3.1416i-1.5271+3.1416i-1.8436+3.1416iCo

4、lumns26through30-2.2727+3.1416i-2.9837+3.1416i-37.0245+0.0000i-3.0017+0.0000i-2.3085+0.0000iColumns31through35-1.8971+0.0000i-1.5978+0.0000i-1.3575+0.0000i-1.1531+0.0000i-0.9723+0.0000iColumns36through40-0.8083+0.0000i-0.6567+0.0000i-0.5151+0.0000i-0.3819+0.0000i-0.2561+0.0000

5、iColumns41through45-0.1374+0.0000i-0.0255+0.0000i0.0792+0.0000i0.1766+0.0000i0.2663+0.0000iColumns46through500.3478+0.0000i0.4206+0.0000i0.4841+0.0000i0.5379+0.0000i0.5815+0.0000iColumns51through550.6145+0.0000i0.6366+0.0000i0.6474+0.0000i0.6470+0.0000i0.6351+0.0000iColumns56t

6、hrough600.6119+0.0000i0.5777+0.0000i0.5327+0.0000i0.4774+0.0000i0.4126+0.0000iColumn610.3388+0.0000i(4)，其中t=0:0.5:2.5>>t=0:0.5:2.5;>>z4=(t>=0&t<1).*(t.^2)+(t>=1&t<2).*(t.^2-1)+(t>=2&t<3).*(t.^2-2.*t+1)z4=00.250001.25001.00002.25002.已知：求下列表达式的值：(1)A+6*B和A-B+I（其中I为单位矩阵）(2)A*B和A.

7、*B(3)A^3和A.^3(4)A/B及BA(5)[A,B]和[A([1,3],:);B^2]>>A=[1234-4;34787;3657];>>B=[13-1;203;3-27];>>A+6*Bans=1852-10467105215349>>I=eye(3);>>A-B+Ians=1231-3328840671(2)>>A*Bans=684462309-72596154-5241>>A.*Bans=1210246802619-13049(3)>>A^3ans=372264860478688>>A.^3ans=172839304-6439304

8、34327343(4)>>A/Bans=16.4000-13.60007.600035.8000-76.200050.20