Warning: "Parethesize the multiplication of 'D' and its transpose to ensure the result is Hermetian."
matlab, matrix, multiplication, parentheses, warnings
Solution
Floating-point arithmetic is not associative. So in general, `a * (b * c)` won't necessarily give the same result as `(a * b) * c`.
Your statement as written is equivalent to `((P * D) * D') * P`, so the compiler is warning you that if you're relying on the Hermitian symmetry of `D * D'`, you should force it to calculate exactly that.
Problem
As you see in the screen shot above, I have the following expression in my Matlab m-file code: `K = P * D * D' * P;` Where, P is an nxn matrix, and D is a nx1 column vector (n=4, if it matters). Why am I getting this warning message? What changes if I use or don't use parenthesis there?