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Matlab¿Î³Ì¸´Ï°´ó¸Ù(1)

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  • 2025/6/14 12:04:07

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42¡¢ÈôÒª¶Ôx½øÐи³Öµ£¬´Ó2µ½20£¬ÖмäµÈ¼ä¸ôÈ¡100¸öµã£¬ÓÃÃüÁî_____________¡£ 43¡¢ÒÑÖªAÊǾØÕó£¬ÇóAµÄ¶Ô½ÇÕóº¯ÊýÊÇ__________£¬ÇóÆäÏÂÈý½Ç¾ØÕóº¯ÊýÊÇ___________¡£ 44¡¢ÒÑÖªA=[1 2 3;4 5 6]£¬A(4)=__________£¬A(2,3)=_____________¡£ 45¡¢MATLABÖУ¬¶þά±ýͼÓɺ¯Êý_________ʵÏÖ¡£

46¡¢MATLABÖУ¬²úÉúËÄάµ¥Î»¾ØÕóµÄÓï¾ä_____________¡£ 47¡¢MATLAB±äÁ¿¶¨Òå

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50¡¢ÒÑÖªA=[5 9 -7 3;7 -5 2 4]£¬ÔòA(1,3)½á¹û_______ºÍA(2,:)½á¹û___________ 51¡¢ÒÑÖªA=[1 4£»5 7£»2 1]£¬ÔòA£¨£º£©ÔËËãµÄ½á¹ûΪ_______________¡£ 52¡¢MatlabÓï¾äA=[10,20;30,40]; B=A>20; C=sum(B), ÔòCΪ_________ 53¡¢²»¸øx¸³Öµ£¬Ö±½Ó»­³öº¯Êýsin(x)ͼÏñµÄÃüÁ 54¡¢Ö´ÐÐquad('sin(x)',0,pi/2)µÄ½á¹ûÊÇ£º 55¡¢Ö´ÐÐsyms x;y=x*x;int(y)µÄ½á¹û£º 56¡¢Ö´ÐÐsyms x;y=x*x;int(y£¬0,1)µÄ½á¹û£º

57¡¢Ö´ÐÐÒÔϳÌÐòsyms x£»y=2*sin(x)*cos(x)£»yy=simple(y) ºóµÄÔËÐнá¹ûÊÇ£º 58¡¢Ö´ÐÐsyms x£»f=exp(x);ff=taylor(f£¬4£¬1)µÄ¹¦ÄÜÊÇ£º

1¡¢Éèy?cosx[0.5?3sinx]£¬°Ñx?0~2?Çø¼ä·Ö³É150¸öµã£¬»­³öÒÔxΪºá×ø±ê£¬y1?x2Ϊ×Ý×ø±êµÄÇúÏߣ¬ÒªÇóÇúÏßΪºìÉ«£¬ÐéÏß¡£

x=linspace(0,2*pi,150);

y=cos(x).*(0.5+(3*sin(x))./(1+x.^2)); plot(x,y,¡¯r¡ª¡®) xlabel(¡® x ¡®) ylabel(¡® y¡¯)

2¡¢Éèx?sint,y?sin(Nt?a)

£¨1£© Èôa?4£¬ÁîN?1,2,3,4£¬ÔÚ4¸ö×ÓͼÖзֱ𻭳öÆäÇúÏß¡£

£¨2£© ÈôN?2£¬È¡a?0,?/3,?/2,?£¬ÔÚ4¸ö×ÓͼÖзֱ𻭳öÆäÇúÏß¡£

(1)t=linspace(0,4*pi,100); x=sin(t) a=4; figure(1) for N=1:4

y=sin(N*t+a); subplot(2,2,N); plot(x,y)

k=['N=',num2str(N)] title(k) end

(2)N=2;i=1; figure(2)

for a=[0,pi/3,pi/2,pi] y=sin(N*t+a); subplot(2,2,i); plot(x,y)

k=['a=',num2str(a)] title(k) i=i+1; end

3¡¢Éèz?x2e?(x2?y2)

1¡¢Çó¶¨ÒåÓòx?[?3,3],y?[?3,3]ÄÚµÄzÖµ(Íø¸ñÈ¡0.1¼û·½)£¬²¢»­³öÈýάͼÐΡ£ 2¡¢z1?0.05x?0.05y?0.1£»»­³öz1µÄÇúÃæ£¨Æ½Ã棩ͼ£¬µþ¼ÓÔÚÉÏÌâµÄͼÖС£

x=-3:0.1:3; y=x;

[X,Y]=meshgrid(x,y);

Z=X.^2.*exp(-(X.^2+Y.^2)) mesh(X,Y,Z)

Z1=0.05*X-0.05*Y+0.1

hold on

mesh(X,Y,Z1) hold off alpha(1)

4¡¢ Éèf(x)?12x?31£¬Ð´³öÒ»¸öMATLABº¯Êý³ÌÐòf31.m£¬Ê¹µÃµ÷ÓÃf1?(x2?2)2?2x4?6ʱ£¬x¿ÉÒÔÓþØÕó´úÈ룬µÃµ½µÄf(x)Ϊͬ½×¾ØÕó¡£»­³öx?[0,4]Çø¼äÄÚµÄf31ÇúÏß¡£ ·Ö±ð±àдÖ÷³ÌÐòzhu.mºÍ×Ó³ÌÐòf31.m´æÔÚÓ²ÅÌÉÏ¡£ÔÚMATLABÃüÁî´°¿Ú¼üÈëÖ÷³ÌÐòÃûzhuÔËÐÐÖ÷³ÌÐò¡£ %Ö÷³ÌÐòzhu.m x=0:0.01:4 f1=f31(x) plot(x,f1)

%×Ó³ÌÐòf31.m function f=f31(x)

f=1./((x.^2-2).^2+2)+(2.*x+31)./( x.^4+6)

5¡¢Çó³ö±í´ïʽ

y?e?2tsin(3t)ÔÚt=[0,10]Çø¼ä±ä»¯Ê±Êä³öy£¬²¢Éú³ÉÏÂͼËùʾ²¨ÐΡ£Çë±à

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clear;a=2;w=3; t=0:0.01:10; y=exp(-a*t).*sin(w*t); [ymax,imax]=max(y);

ttext=['t=',num2str(t(imax))]; ytext=['y=',num2str(ymax)]; maxtext=char('maximum',ttext,ytext);

tit=['y=exp(-',num2str(a),'t)*sin(',num2str(w),'t)']; plot(t,zeros(size(t)),'k') ; hold on plot(t,y,'b') plot(t(imax),ymax,'r.','MarkerSize',20) text(t(imax)+0.3,ymax+0.05,maxtext) title(tit),xlabel('t'),ylabel('y'),hold off

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