Create a Matrix from defined variables

Question

wissal zaher 2022-1-22

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1633945-create-a-matrix-from-defined-variables

评论： wissal zaher 2022-1-22

Hey guys, I'm trying to create a matrix with combined math operations from already defined variables in the workspace but I always get an error. I would really appreciate some help :)

Variables :

c1=440

c2=250

r1= 50

r2=25

Matrix :

C=[c1*r1^2, c1*r1*r2, 0;

c1*r2*r1, c2+c1*c2^2, -c2;

0, -c2, c2]

2 个评论
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Torsten 2022-1-22

For me, it works fine.

What error message do you get ?

wissal zaher 2022-1-22

That in order to define a function I have to use brackets but now it worked somehow.. I don't know why it was bugging

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Answer 1

KSSV 2022-1-22

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1633945-create-a-matrix-from-defined-variables#answer_879555

在 MATLAB Online 中打开

c1=440 ;
c2=250 ;
r1= 50 ;
r2=25 ;
C=[c1*r1^2,    c1*r1*r2,   0;
   c1*r2*r1, c2+c1*c2^2, -c2;
   0,          -c2,       c2]
C = 3×3
     1100000      550000           0
      550000    27500250        -250
           0        -250         250

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wissal zaher 2022-1-22

now it worked ! I don't know why I was getting an error earlier. Thanks :)

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Answer 2

Louis Alexander 2022-1-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1633945-create-a-matrix-from-defined-variables#answer_879590

在 MATLAB Online 中打开

this code is right.

c1=440 
c1 = 440
c2=250 
c2 = 250
r1= 50 
r1 = 50
r2=25 
r2 = 25
C=[c1*r1^2,    c1*r1*r2,   0;
   c1*r2*r1, c2+c1*c2^2, -c2;
   0,          -c2,       c2]
C = 3×3
     1100000      550000           0
      550000    27500250        -250
           0        -250         250