how to do this problem???

speed_cat_0

n=[0.035,0.020,0.015,0.030,0.022]';
>> S=[.001,0.0002,0.0010,0.0008,0.0003]';
>> B=[10,8,19,24,15]';
>> H=[2,1,1.5,3,2.5]';
>> table=n,S,B,H

table =

    0.0350
    0.0200
    0.0150
    0.0300
    0.0220


S =

  1.0e-003 *

    1.0000
    0.2000
    1.0000
    0.8000
    0.3000


B =

    10
     8
    19
    24
    15


H =

    2.0000
    1.0000
    1.5000
    3.0000
    2.5000
U=sqrt(S)/n(B*H/B+2*H)^2/3
??? Error using ==> mtimes
Inner matrix dimensions must agree.
whta is wrong with this equation?  you guys can type chinese.i use school's computer,i cantot type chinese.

mhkmars

回复 1 # speed_cat_0 的帖子

既然是矩阵，那么就应该使用点运算，例如*应该为.*;/应该为./

mhkmars

回复 1 # speed_cat_0 的帖子

1. >> n=[0.035,0.020,0.015,0.030,0.022]';
   
2. S=[.001,0.0002,0.0010,0.0008,0.0003]';
   
3. B=[10,8,19,24,15]';
   
4. H=[2,1,1.5,3,2.5]';
   
5. >> U=sqrt(S)/n(B*H/B+2*H)^2/3
   
6. ??? Error using ==> mtimes
   
7. Inner matrix dimensions must agree.
   
8. 
   
9. >> U=sqrt(S)./n.*(B.*H./B+2.*H).^2/3
   
10. 
    
11. U =
    
12. 
    
13.    10.8421
    
14.     2.1213
    
15.    14.2302
    
16.    25.4558
    
17.    14.7618
    
18. 
    

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