25 reputation
5
bio website
location
age
visits member for 3 years, 3 months
seen Oct 12 at 0:49

Mar
21
awarded  Popular Question
Jan
29
awarded  Student
Jan
29
asked 3D Numerical differentiation with spline approximation
Oct
21
accepted Meaning of mathematical operator that consists of square brackets with a plus sign as a subscript
Oct
17
awarded  Teacher
Oct
17
answered Meaning of mathematical operator that consists of square brackets with a plus sign as a subscript
Oct
17
awarded  Editor
Oct
17
revised Meaning of mathematical operator that consists of square brackets with a plus sign as a subscript
added 169 characters in body
Oct
16
comment Meaning of mathematical operator that consists of square brackets with a plus sign as a subscript
"Ordered subsets algorithms for transmission tomography" by Erdogan and Fessler. Phys. Med. Biol. 44 (1999) 2835–2851
Oct
16
asked Meaning of mathematical operator that consists of square brackets with a plus sign as a subscript
May
25
accepted Linear algebra norm notation
May
25
comment Linear algebra norm notation
Yes, you are right. The paper does mention that the elements of $\mathbf{D}$ are positive. So you are saying that $\mathbf{D}$ does not have to be diagonal, right?
May
25
comment Linear algebra norm notation
Ok. I understand that the superscript 2 means "squared." I can also see why this expressions is natural. My only question was about the subscript $D$. I think your answer makes sense i.e the author defined the $||x||_D$ as $x^T D x$. I was just wondering if this operation had a particular name. Thanks!
May
25
asked Linear algebra norm notation
Apr
24
awarded  Scholar
Apr
24
accepted Can the joint PDF of two random variables be computed from their marginal PDFs?
Apr
24
comment Can the joint PDF of two random variables be computed from their marginal PDFs?
Ok. So in the example that I provided, since we know X and Y are Gaussian with a certain correlation coefficient, we can find their joint PDF, right? Thank you. Things are clearer now
Apr
24
asked Can the joint PDF of two random variables be computed from their marginal PDFs?