·¢²¼Ê±¼ä : ÐÇÆÚËÄ ÎÄÕÂMatlab-ÆÚÄ©¿¼ÊÔÌâ¿â£¨¹²12Ì×¾í£©¸üÐÂÍê±Ï¿ªÊ¼ÔĶÁ
4. Çå¿ÕMatlab¹¤×÷¿Õ¼äÄÚËùÓбäÁ¿µÄÖ¸ÁîÊÇ£¨C £© (A) clc (B) cls (C) clear (D) clf
5. ÓÃroundº¯ÊýËÄÉáÎåÈë¶ÔÊý×é[2.48 6.39 3.93 8.52]È¡Õû£¬½á¹ûΪ£¨ C £©
(A) [2 6 3 8] (B) [2 6 4 8] (C) [2 6 4 9] (D) [3 7 4 9]
6. ÒÑÖªa=2:2:8, b=2:5£¬ÏÂÃæµÄÔËËã±í´ïʽÖУ¬³ö´íµÄΪ£¨ C £©
(A) a'*b (B) a .*b (C) a*b (D) a-b
7. ½Ç¶Èx??304560?£¬¼ÆËãÆäÕýÏÒº¯ÊýµÄÔËËãΪ£¨D £©
(A) SIN£¨deg2rad(x)£© (B) SIN(x) (C) sin(x) (D) sin(deg2rad(x))
8. ÏÂÃæµÄ³ÌÐòÖ´ÐкóarrayµÄֵΪ ( A) for k=1:10 if k>6 break; else
array(k) = k; end end
(A) array = [1, 2, 3, 4, 5, 6] (B) array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
(C) array =6 (D) array =10.
9£®i=2; a=2i; b=2*i; c=2*sqrt(-1); ³ÌÐòÖ´Ðкó£»a, b, cµÄÖµ·Ö±ðÊǶàÉÙ£¿
(A)a=4, b=4, c=2.0000i (C ) (B)a=4, b=2.0000i, c=2.0000i (C)a=2.0000i, b=4, c=2.0000i
(D) a=2.0000i, b=2.0000i, c=2.0000i
10. Çó½â·½³Ìx4-4x3+12x-9 = 0 µÄËùÓн⣨ A£© (A)1.0000, 3.0000, 1.7321, -1.7321 (B)1.0000, 3.0000, 1.7321i, -1.7321i (C)1.0000i, 3.0000i, 1.7321, -1.7321 (D)-3.0000i, 3.0000i, 1.7321, -1.7321
Èý¡¢ÔĶÁ³ÌÐò²¢»Ø´ðÎÊÌ⣨ÿÌâ5·Ö£¬¹²20·Ö£© 1¡¢Ð´³öÏÂÁÐÖ¸ÁîÔËÐнá¹û¡£ A=zeros(2,4);
A(:)=1:8;
s=[2 3 5]; A(s)
Sa=[10 20 30]' A(s)=Sa ans = 2 3 5 Sa = 10 20 30 A =
1 20 30 7
10 4 6 8
2¡¢Ð´³öÏÂÁÐÖ¸ÁîÔËÐнá¹û¡£ A=reshape(1:16,2,8) reshape(A,4,4)
s=[1 3 6 8 9 11 14 16]; A(s)=0
´ð°¸£ºA=reshape(1:16,2,8) A =
1 3 5 7 9 11 13 15 2 4 6 8 10 12 14 16
reshape(A,4,4) ans = 1 5 9 13 2 6 10 14 3 7 11 15 4 8 12 16
s=[1 3 6 8 9 11 14 16]; A(s)=0 A =
0 0 5 7 0 0 13 15 2 4 0 0 10 12 0 0
3¡¢Ð´³öÏÂÁÐÖ¸ÁîÔËÐнá¹û¡£
A=[1,2;3,4]; B=[-1,-2;2;1]; S=3;
A.*B A*B S.*A S*B
´ð°¸£º ans = -1 -4 6 4 ans = 3 0 5 -2 ans = 3 6 9 12 ans = -3 -6 6 3
4¡¢ÏÂÃæµÄº¯ÊýÖ÷ÒªÍê³Éʲô¹¦ÄÜ£¿ function f=factor(n)
if n<=1 f=1;
else
f=factor(n-1)*n;
End
´ð£ºÀûÓú¯ÊýµÄµÝ¹éµ÷Óã¬Çón£¡¡£ ËÄ¡¢³ÌÐòÌî¿Õ(ÿ¿Õ3·Ö£¬¹²15·Ö)
1. ±àдMATLAB³ÌÐò£¬ÔÚͬһͼÐδ°¿ÚÖлæÖÆy1ºÍy2Á½ÌõÇúÏߣ¬²¢¶ÔͼÐÎ×ø
±êÖá½øÐпØÖÆ¡£³ÌÐòÈçÏ£º x = -3:0.1: 3;
y1 = 2*x+5; y2 = x.^2-3*x; plot(x,y1); %»æÖÆÇúÏßy1 ¢Ù; %±£³ÖÇúÏßy1¢Ù hold on plot(x,y2); %»æÖÆÇúÏßy2
m1 = max([y1, y2]); m2 = min([y1, y2]);
¢Ú; %ÓÃaxisµ÷ÖÆ×ø±êÖᣬºá×ø±êÔÚ[-3 3]Ö®¼ä£¬ÇÒÍêÈ«ÏÔʾͼÐÎ ¢Û; %¼ÓÈëͼÐÎ×¢ÊÍ£¬ºá×ø±êΪ¡°Ê±¼ä¡±£¬×Ý×ø±êΪ¡°·ù¶È¡±
2. ±àдMATLAB³ÌÐò£¬¶ÔÓÚÓû§ÊäÈëµÄÏòÁ¿»ò¾ØÕ󣬼ÆËãÆäƽ¾ùÖµºÍ·½²î£º
¢Ü; % ÌáʾÊäÈëÊý¾Ý²¢±£´æµ½xÖУ¬ÃüÁîÐÐÏÔʾ¡°ÇëÊäÈëÊý¾Ý¡± y = reshape(x,1,prod(size(x))); m = mean(y); % ¼ÆËã¾ùÖµm ¢Ý; % ¼ÆËã·½²îv ¢Ù hold on
¢Ú axis([-3 3 m2 m1])
¢Û xlabel(¡®Ê±¼ä¡¯); ylabel(¡®·ù¶È¡¯);
¢Ü x = input(¡®ÇëÊäÈëÊý¾Ý \\n¡¯) »ò x = input(¡®ÇëÊäÈëÊý¾Ý¡¯) ¢Ý v = var(y)»ò 1/(length(y)-1) * (sum((y-m).^2))
Îå¡¢±à³ÌÌ⣨40·Ö£©
1¡¢·Ö±ðÔÚͬһͼÐδ°µÄ²»Í¬×Óͼ»æÖÆy=sin(t)sin(9t)ºÍy=sin(t)sin(9t)¼°Æä°üÂçÏß¡££¨5·Ö£©
t=(0:pi/100:pi)'; y1=sin(t)*[1,-1]; y2=sin(t).*sin(9*t); t3=pi*(0:9)/9;
y3=sin(t3).*sin(9*t3);subplot(1,2,1) plot(t,y1,'r:',t,y2,'b',t3,y3,'bo') subplot(1,2,2) plot(t,y2,'b') axis([0,pi,-1,1])
2¡¢±àд³ÌÐòʵÏÖf(n)=f(n-1)+f(n-2)£¨f(1)=1ºÍf(2)=2£©º¯Êý¡££¨5·Ö£© function f=fab(n) if (n==1) f = 1;
elseif (n==2) f =2; else
f = fab(n-1) + fab(n-2);
End
3¡¢Çó½âÒÔÏÂÏßÐÔ·½³Ì×飬ҪÇóд³ö³ÌÐò´úÂëºÍÔËÐнá¹û£¨5·Ö£©
2x1-3x2+x3+2x4=8 x1+3x2+x4=6 x1-x2+x3+8x4=1 7x1+x2-2x3+2x4=5 >> syms a b c x
>> syms x1 x2 x3 x4 >> clear
>> syms x1 x2 x3 x4
>> f = 2*x1 + 3*x2 + x3 + 2*x4 -8; >> g = x1 + 3*x2 + x4 - 6;
>> h = x1 - x2 + x3 + 8*x4 - 1; >> i = 7*x1 + x2 - 2*x3 + 2*x4 -5; >> [x1,x2,x3,x4] = solve(f,g,h,i) x1 =