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1、MATLAB课后习题答案2.1x=[15223394857760]x(6)x([135])x(4:end)x(find(x>70))2.3A=zeros(2,5);A(:)=-4:5L=abs(A)>3islogical(L)X=A(L)2.4A=[4,15,-45,10,6;56,0,17,-45,0]find(A>=10&A<=20)2.5p1=conv([1,0,2],conv([1,4],[1,1]));p2=[1011];[q,r]=deconv(p1,p2);cq='商多项式为';cr='余多项式为';disp([cq,poly2st
2、r(q,'s')]),disp([cr,poly2str(r,'s')])3.1n=(-10:10)';y=abs(n);plot(n,y,'r.','MarkerSize',20)axisequalgridonxlabel('n')3.2x=0:pi/100:2*pi;y=2*exp(-0.5*x).*sin(2*pi*x);plot(x,y),gridon;3.3t=0:pi/50:2*pi;x=8*cos(t);y=4*sqrt(2)*sin(t);z=-4*sqrt(2)*sin(t);plot3(x,y,z,'p');title('Li
3、nein3-DSpace');text(0,0,0,'origin');xlabel('X'),ylable('Y'),zlable('Z');grid;3.4theta=0:0.01:2*pi;rho=sin(2*theta).*cos(2*theta);polar(theta,rho,'k');3.5[x,y,z]=sphere(20);z1=z;z1(:,1:4)=NaN;c1=ones(size(z1));surf(3*x,3*y,3*z1,c1);holdonz2=z;c2=2*ones(size(z2));c2(:,1:4)=3*on
4、es(size(c2(:,1:4)));surf(1.5*x,1.5*y,1.5*z2,c2);colormap([0,1,0;0.5,0,0;1,0,0]);gridonholdoff4.1form=100:999m1=fix(m/100);m2=rem(fix(m/10),10);m3=rem(m,10);ifm==m1*m1*m1+m2*m2*m2+m3*m3*m3disp(m)endend4.3y=0;n=100;fori=1:ny=y+1/i/i;endy4.4s=0;fori=1:5s=s+factor(i);ends4.5sum=0
5、;i=1;whilesum<2000sum=sum+i;i=i+1;end;n=i-24.6i=0;k=0;whilei<=63k=k+2^i;i=i+1;endkii=0;k=0;fori=0:63k=k+2^i;endik5.1A=[2,1,-5,1;1,-5,0,7;0,2,1,-1;1,6,-1,-4];b=[13,-9,6,0]';x=Ab5.3X=linspace(0,2*pi,50);Y=sin(X);P=polyfit(X,Y,3)AX=linspace(0,2*pi,50);Y=sin(X);Y1=polyval(P,X)pl
6、ot(X,Y,':O',X,Y1,'-*')
