MATLAB程序的设计与应用(刘卫国编)课后实验答案.doc

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1、......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)(2)，其中(3)(4)，其中t=0:0.5:2.5解：M文件:z1=2*sin(85*pi/180)/(1+exp(2))x=[21+2*i;-.455];z2=1/2*log(x+sqrt(1+x^2))a=-3.0:0.1:3.0;z3=(exp(0.3.*a)-exp(-0.3.*a))./2.*sin(a+0.3)+log((0.3+a)./2)t=0:0.5:2.5;z4=(t>=0&t<1).*(t.^2)+(t>=1&t<2

2、).*(t.^2-1)+(t>=2&t<3).*(t.^2-2*t+1).学习帮手.......运算结果：z1=2*sin(85*pi/180)/(1+exp(2))x=[21+2*i;-.455];z2=1/2*log(x+sqrt(1+x^2))a=-3.0:0.1:3.0;z3=(exp(0.3.*a)-exp(-0.3.*a))./2.*sin(a+0.3)+log((0.3+a)./2)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)z1=0

3、.2375z2=0.7114-0.0253i0.8968+0.3658i0.2139+0.9343i1.1541-0.0044iz3=Columns1through40.7388+3.1416i0.7696+3.1416i0.7871+3.1416i0.7913+3.1416iColumns5through8.学习帮手.......0.7822+3.1416i0.7602+3.1416i0.7254+3.1416i0.6784+3.1416iColumns9through120.6196+3.1416i0.5496+3.1416i0.4688+3.1416i0

4、.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-2.272

5、7+3.1416i-2.9837+3.1416i-37.0245Columns29through32-3.0017-2.3085-1.8971-1.5978.学习帮手.......Columns33through36-1.3575-1.1531-0.9723-0.8083Columns37through40-0.6567-0.5151-0.3819-0.2561Columns41through44-0.1374-0.02550.07920.1766Columns45through480.26630.34780.42060.4841Columns49throug

6、h520.53790.58150.61450.6366Columns53through560.64740.64700.63510.6119Columns57through600.57770.53270.47740.4126Column610.3388z4=.学习帮手.......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.*B(3)A^3和A.^3(4)A/B及BA(5)[A,B]和[A([1,3],:);B^2]解：M文件：A=[1234-4;34787;

7、3657];B=[13-1;203;3-27];A+6.*BA-B+eye(3)A*BA.*BA^3A.^3A/BBA.学习帮手.......[A,B][A([1,3],:);B^2]运算结果：A=[1234-4;34787;3657];B=[13-1;203;3-27];A+6.*BA-B+eye(3)A*BA.*BA^3A.^3A/BBA[A,B][A([1,3],:);B^2]ans=1852-10467105215349ans=1231-332884.学习帮手.......0671ans=684462309-72596154-5241ans=121

8、0246802619-13049ans