Cramer's Rule using for loop

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Matthias Bossenbroek
评论： Rakib Seemanto 2020-11-1
Hi,
For a school exercise I need to use Cramer's rule to determine Ax=b.
I need to execute this using a for loop. Currently I'm facing an issue where if I replace the column's off A by, they will remain b so that my next determinant (x2) is not correct. How do I get the original (a1) column back in the second loop, (and again for the third en fourth)?
my current code:
A = [1,1,-3,2;0,-1,4,0;-3,1,2,2;1,2,3,6]
b = [1;2;3;4]
detA = det(A)
[z,z] = size(A);
for g = 1:z;
A(:,g) = b
x = det(A)
end
Cheers,
Matthias
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Anusha Sridharan
Anusha Sridharan 2019-1-9
[Answers Dev] Restored Edits
Rakib Seemanto
Rakib Seemanto 2020-11-1
how to find the value of x and y by using Cramer’s rule from these equations:
𝑎𝑥+𝑏𝑦=𝑐 and 𝑑𝑥+𝑒𝑦=𝑓 ???

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采纳的回答

KSSV
KSSV 2018-10-3
编辑：KSSV 2018-10-3
A = rand(3) ;
b = rand(3,1) ;
[m,n] = size(A) ;
x = zeros(m,1) ;
for i = 1:m
T = A ;
T(:,i) = b ;
x(i) = det(T)/det(A) ;
end
% Simply use \
sol = A\b ;
[x sol]
  1 个评论
Rakib Seemanto
Rakib Seemanto 2020-11-1
how to find the value of x and y by using Cramer’s rule from these equations:
𝑎𝑥+𝑏𝑦=𝑐 and 𝑑𝑥+𝑒𝑦=𝑓 ???

请先登录，再进行评论。

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