1¡¢ÔÚÒ»¸öMATLABÃüÁîÖУ¬6+7iºÍ6+7*iÓкÎÇø±ð£¿iºÍIÓкÎÇø±ð£¿ µÚÒ»¸öi´ú±íÒ»¸ö±äÁ¿,6+7iÊÇÒ»¸öº¯Êý£»µÚ¶þ¸ö´ú±íÐéÊý,6ÊÇʵ²¿,7ÊÇÐ鲿.IÖ»´ú±í±äÁ¿¡£
2¡¢ÉèAºÍBÊÇÁ½¸öͬ´óСµÄ¾ØÕó£¬ÊÔ·ÖÎöA*BºÍA.*B¡¢A./BºÍB.\\A¡¢A/BºÍB/AµÄ Çø±ð£¿Èç¹ûAºÍBÊÇÁ½¸ö±êÁ¿Êý¾Ý£¬½áÂÛÓÖÈçºÎ£¿ A *BÊǾØÕóÏà³Ë£¬
A.*B±íʾAºÍBµ¥¸öÔªËØÖ®¼ä¶ÔÓ¦Ïà³Ë¡£ A./BºÍB.\\AÖµÏàµÈ£¬ÊÇÒ»ÑùµÄ¡£
A/BµÈЧÓÚBµÄÄæÓÒ³ËAµÄ¾ØÕó£¬B\\AµÈЧÓÚB¾ØÕóÄæ×ó³ËA¾ØÕó¡£ Èç¹ûAºÍBÊÇÁ½¸ö±êÁ¿Êý¾Ý£¬½áÂÛÊǶ¼Ã»ÓÐÇø±ð¡£ 3¡¢Ð´³öÍê³ÉÏÂÁвÙ×÷µÄÃüÁî¡£
£¨1£©É¾³ý¾ØÕóAµÄµÚ7ºÅÔªËØ A(7)=[]
£¨2£©½«ÏòÁ¿tµÄ0ÔªËØÓûúÆ÷ÁãÀ´´úÌæ t(find(t==0))=eps
£¨3£©½«º¬ÓÐ12¸öÔªËØµÄÏòÁ¿xת»»³É3*4¾ØÕó newA=reshape(A,3,4) £¨4£©ÇóÒ»¸ö×Ö·û´®µÄASCII ch=['a b c';'1 2 3']; abs ch
£¨5£©²úÉúºÍAͬÑù´óСµÄçÛ¾ØÕó ones(size(A))
£¨6£©´Ó¾ØÕóAÌáÈ¡Ö÷¶Ô½ÇÏßÔªËØ£¬²¢ÒÔÕâÐ©ÔªËØ¹¹³É¶Ô½ÇÕóB A=[1 2 3;4 5 6;7 8 9]; D=diag(A) B=diag([1,5,9])
4¡¢ÒªÉú²ú¾ùֵΪ3£¬·½²îΪ1µÄ500¸öÕý̬·Ö²¼µÄËæ»úÐòÁУ¬Ð´³öÏàÓ¦µÄ±í´ïʽ
y=3+sqrt(1)*randn(500) 5¡¢(1)Ö÷¶Ô½ÇÔªËØ 1 1 5 9 ÉÏÈý½Ç¾ØÕó 1 -1 2 3 0 1 -4 2 0 0 5 2 0 0 0 9
ÏÂÈý½Ç¾ØÕó 1 0 0 0
Ò³ 16
5 1 0 0 3 0 5 0 11 15 0 9
Äæ¾ØÕó -0.1758 0.1641 0.2016 -0.0227 -0.1055 -0.1016 -0.0391 0.0664 -0.0508 -0.0859 0.1516 0.0023 0.3906 -0.0313 -0.1813 0.0281 ÐÐÁÐʽµÄÖµ 1280 ÖÈ 4
·¶Êý A1=norm(A,1)=20 A2=norm(A)=21.3005 A3=norm(A,inf)=35
Ìõ¼þÊý A1=cond(A,1)=14.4531 A2=cond(A,2)=11.1739 A3=cond(A,inf)=22.0938 ¼£ 16
£¨2£© Ö÷¶Ô½ÇÔªËØ 0.43 4
ÉÏÈý½Ç¾ØÕó 0.4300 43.0000 2.0000 0 4.0000 21.0000 ÏÂÈý½Ç¾ØÕó 0.4300 0 0 -8.9000 4.0000 0 Äæ¾ØÕó 0.0022 -0.0175 0.0234 -0.0017 -0.0508 -0.0859 ÐÐÁÐʽµÄÖµ ÖÈ 2
·¶Êý B1=norm(B,1)=47 B2=norm(B)=43.4271 B3=norm(B,inf)=45.4300 Ìõ¼þÊý B2=cond(B,2)=1.9354 ¼£ 4.4300 6¡¢all(A)=0 Any(A)=1
isnan(A)=0 1 0 0 0 0 0 isinf(A)=0 0 1 1 0 0 0 isfinite(A)=1 0 0 0 1 1 1 7¡¢½á¹¹¾ØÕó½¨Á¢
½á¹¹¾ØÕóÃû.³ÉÔ±Ãû=±í´ïʽ µ¥Ôª¾ØÕó½¨Á¢
17
Ò³ ¾ØÕóÔªËØÓôóÀ¨ºÅÀ¨ÆðÀ´¡£
8¡¢ÓÃÏ¡Êè´æ´¢·½Ê½¿ÉÒÔ½ÚÊ¡ÄÚ´æ¿Õ¼ä£»ÔËËã¹æÔòÉÏ£¬Ï¡Êè¾ØÕóÓëÆÕͨ¾ØÕóÒ»Ñù£¬Ö»ÊǾØÕóµÄ´æ´¢·½Ê½²»Í¬¡£ÔÚÔËËã¹ý³ÌÖУ¬Ï¡Êè´æ´¢¾ØÕó¿ÉÒÔÖ±½Ó²ÎÓëÔËËã¡£µ±²ÎÓëÔËËãµÄµÄ¶ÔÏó²»È«ÊÇÏ¡Êè´æ´¢¾ØÕóʱ£¬ËùµÃ½á¹ûÒ»°ãÊÇÍêÈ«´æ´¢ÐÎʽ¡£
3¡¢³ÌÐòÉè¼ÆÊµÑé
Ò»¡¢ÊµÑéÄÚÈÝ
1¡¢n=input('ÇëÊäÈëÒ»¸öÈýλÊý£º¡¯); n1=fix(n/100); n2=rem(fix(n/10),10); n3=rem(n,10); m=n3*100+n2*10+n1;
disp(m)
2¡¢(1)ifÓï¾ä
s=input('ÇëÊäÈëѧÉú³É¼¨£º'); if s>=90&s<=100 disp('A'); break;
18
Ò³else
if s>=80&s<90 disp('B'); break; else
if s>=70&s<80 disp('C'); break; else
if s>=60&s<70 disp('D'); break; else
if s>=0&s<60 disp('E'); break; else
disp('ÊäÈë³É¼¨´íÎó'); break; end end end
19
Ò³