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题目解答5-15-25-35-45-55-65-7

题目

解答

5-1

>> ezplot('(sin(x))^2/(1+x^2)') >> axis([-4,4,-0.1,0.45]);grid on

5-2

>> x=[0:10:1200]; >> a1=pi/6;a2=pi/4;a3=5*pi/12; >> y1=x*tan(a1)-(9.8*x.^2)./(2*100*100*cos(a1)*cos(a1)); >> y2=x*tan(a2)-(9.8*x.^2)./(2*100*100*cos(a2)*cos(a2)); >> y3=x*tan(a3)-(9.8*x.^2)./(2*100*100*cos(a3)*cos(a3)); >> plot(x,y1,'-',x,y2,':',x,y3,'*');grid on

5-3

>> theta=[0:2*pi]; >> r=-cos(2*theta).*sec(theta); >> [x,y]=pol2cart(theta,r); >> subplot(1,2,1);polar(theta,r) >> subplot(1,2,2);plot(x,y);grid on

(做出来异常奇怪。)

5-4

>> a=pi/2:4*pi/5:4*pi; >> A=exp(i*a); >> x=real(A); >> y=imag(A); >> fill(x,y,'y') >> axis square >> hold on >> x1=-1:0.001:1; >> y1=sqrt(1^2-x1.^2); >> y2=-sqrt(1^2-x1.^2); >> plot(x1,y1,x1,y2)

5-5

>> bar3(magic(5)) >> colormap(spring)

5-6

>> o=[2000 1500 600 200 300 700]; >> [m,i]=max(o) m = 2000 i = 1 >> explode=zeros(size(o)); >> explode(i)=1 explode = 1 0 0 0 0 0 >> pie(o,explode)

5-7

>> a=-pi/2:pi/30:pi/2; >> b=0:pi/9:pi/4; >> r1=0.5+0.45*cos(a); >> r2=0.5+0.39*sin(b); >> r=[0.5,r1,0.5,0.5,r2]; >> cylinder(r,24) >> colormap(spring)