Matlab-程序設(shè)計(jì)教程(第二版)劉衛(wèi)國-課后參考答案

1、第二章1 求以下表達(dá)式的值。1w=sqrt(2)*(1+0.34245*10(-6)(2)a=3.5;b=5;c=-9.8;x=(2*pi*a+(b+c)/(pi+a*b*c)-exp(2)/tan(b+c)+a(3)a=3.32;b=-7.9;y=2*pi*a(2)*(1-pi/4)*b-(0.8333-pi/4)*a(4)t=2,1-3*i;5,-0.65;z=1/2*exp(2*t)*log(t+sqrt(1+t(2)2 求以下表達(dá)式A=-1,5,-4;0,7,8;3,61,7;B=8,3,-1;2,5,3;-3,2,0;(1)A+6*B A2-B+eye(2)A*B A.*B B.*A

2、(3)A/B BA(4)A,B A(1,3,:);B23 根據(jù)已知，完成以下操作1A=23,10,-0.778,0;41,-45,65,5;32,5,0,32;6,-9.54,54,3.14;K=find(A>10&A<25);A(K)2A=23,10,-0.778,0;41,-45,65,5;32,5,0,32;6,-9.54,54,3.14;B=A(1:3,:) C=A(:,1:2) D=A(2:4,3:4) E=B*C3E<D E&D E|D E|D第三章1 從鍵盤輸入一個(gè)3位數(shù)，將它反向輸出，如輸入639，出數(shù)936。f=input('輸入一個(gè)

3、數(shù)：','s');f(end :-1:1)2 用if語句 score=input('請(qǐng)輸入成績:');if score>=90&&score<=100 disp('A');elseif score>=80&&score<=89 disp('B');elseif score>=70&&score<=79 disp('C');elseif score>=60&&score<=69; disp('

4、;D');elseif score<60&&score>=0; disp('E');else disp('出錯(cuò)');end用switch語句score=input('請(qǐng)輸入成績:');switch fix(score/10) case 9,10 disp('A'); case 8 disp('B'); case 7 disp('C'); case 6 disp('D'); case 0,1,2,3,4,5 disp('E'); ot

5、herwise disp('出錯(cuò)'); end第四章1題1) X=0:10;Y=x-x.3/6;Plot(x,y)2) t=0:0.01:2*pi;x=8.*cos(t);y=4*sqrt(2).*sin(t);plot(x,y)2題M文件：t=-pi:pi/10:pi;y=1./(1+exp(-t);subplot(2,2,1);bar(t,y,'b');title('bar(t,y,''b'')');axis(-5,5,-3,3);subplot(2,2,2);stairs(t,y,'k');t

6、itle('stairs (t,y,''k'')');axis(-5,5,-3,3);subplot(2,2,3);stem(t,y,'m');title('stem (t,y,''m'')');axis(-5,5,-3,3);subplot(2,2,4);loglog(t,y,'g');title('loglog(t,y,''g'')');axis(-5,5,-3,3);3題1 t=0:pi/100:2*pi;y=5*

7、cos(t)+4;polar(t,y,'-*')2 t=-pi/3:pi/100:pi/3;r=5*sin(t).2./cos(t); polar(t,r,'-*')4題1)t=0:pi/100:2*pi;x=exp(-t/20).*cos(t);y=exp(-t/20).*sin(t);z=t;plot3(x,y,z)第五章：1題A=randn(10,5)1) X=mean(A)Y=std(A,0,1)2) max(max(A)min(min(A)3) B=sum(A,2)sum(B)4) sort(A);sort(A,2,'descend')

8、2題1 t=0:15:90;x1=0,0.2588,0.5000,0.7071,0.8660,0.9659,1.0000;a1=0:1:90;y1=interp1(t,x1,a1,'spline')x2=0,0.2679,0.5774,1.0000,1.7320,3.7320,NaN;a2=0:1:75;y2= interp1(t,x2,a2,'spline')p1=polyfit(t,x1,5);z1=polyval(p1,a1)p2=polyfit(t,x2,5);z2=polyval(p2,a2)4題P=2,-3,5,13;Q=1,5,8;p=polyde

9、r(P)p1=polyder(P,Q)p,q= polyder(P,Q)5題P1=1,2,4,0,5;P2=1,0;P3=1,2,3;1) P4=conv(P2,P3)P4=0,1,2,3,0;P=P1+P42) x=roots(P)3) A=-1,1.2,-1.4;0.75,2,3.5;0,5,2.5;Y=polyval(P,A)4) Z=polyvalm(P,A)第8章. (2)factor(sym(5135)(1)syms A x y;A=x4-y4;factor(A)1syms x; 2syms x;limit(x-2)/(x2-4),x,2) f=(sqrt(pi)-sqrt(aco

10、s(x)/sqrt(x+1); limit(f,x,-1,'right')3.求函數(shù)的符號(hào)導(dǎo)數(shù)。 1syms x y 2sym x; f=sin(1/x); f=(1-cos(2*x)/x; diff(f) diff(f,x,2) diff(f) diff(f,x,2)1x=sym(x) (2)sym(y) f=sqrt(exp(x)+1) f=x/(x+y) int(f) int(f) (3) (4) f=exp(x).*(1+exp(x)2; f=x .*log(x) int(f,0,log(2) int(f,1,exp(1) syms n;s=symsum(-1)(n+1)/n,1,inf)x=sym(x');syms n;s=symsum(x(2*n