inv(A) versus /A. Which of the two is the correct one
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Hi all,
Let B be a n by 2 matrix and A is a 2 by 2 positive definite matrix. Which of the following two is correct
for i=1:n
B(i,:)*inv(A)*B(i,:)';
end
or
for i=1:n
(B(i,:)/A)*B(i,:)';
end
Best, Stef
Antworten (1)
Matt J
am 12 Feb. 2015
Both are equivalent. For large matrices the 2nd would be more efficient.
Further efficiency would be gained by vectorizing. The whole loop is just,
sum( (B/A).*B, 2)
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