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HELP PLEASE (( matrix))

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Melika Eft
Melika Eft on 31 Oct 2020
Closed: MATLAB Answer Bot on 20 Aug 2021
how can i find the determinants of a matrix ( 3*3) without inbuild functions (det)
thank u

Answers (1)

Ameer Hamza
Ameer Hamza on 31 Oct 2020
Edited: Ameer Hamza on 31 Oct 2020
You can just use the formula for determinant
A = rand(3);
d = A(1,1)*(A(2,2)*A(3,3)-A(3,2)*A(2,3)) ...
-A(1,2)*(A(2,1)*A(3,3)-A(3,1)*A(2,3)) ...
+A(1,3)*(A(2,1)*A(3,2)-A(3,1)*A(2,2));
Check if it is correct
>> abs(d-det(A))
ans =
3.4694e-18
A very tiny difference is caused by numerical error.

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