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  • 0 posts edited
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  • 186 votes cast
Jun
13
comment Decomposition of an asymmetric 'postive definite' matrix
by asymmetric do you mean not symmetric or antisymmetric? Also you use $\succcurlyeq$ but you say positive definite, which do you mean?
Jun
13
comment Differentiation of a complex matrix
en.wikipedia.org/wiki/Matrix_calculus#Matrix-by-scalar
Jun
7
comment Is this series convergent?
do the terms go to zero?
Jun
6
accepted Given a biased coin $P(X=0)=.75$, can someone show me a compression scheme that beats 1 bit
Jun
6
comment Given a biased coin $P(X=0)=.75$, can someone show me a compression scheme that beats 1 bit
wow so simple, I was sure bothering with '0' '1' combos would be a mistake since they are low probability but mapping them to the longer code lengths makes sense. Thanks!
Jun
6
asked Given a biased coin $P(X=0)=.75$, can someone show me a compression scheme that beats 1 bit
Jun
6
comment Hessian Matrix and critical point
look at the eigenvalues of the matrix, specifically are they positive, negative, a mixture of both?
Jun
5
comment Problem for number theory
$\sum_{k=1}^nkx_k = \sum_{j=1}^n\sum_{k=j}^nx_k$ this might help
Jun
2
comment How to solve $\min \limits_{\mathbf{x}} \| \mathbf{Ax}-\mathbf{b} \|^2$?
if A is non-negative you need to include that as one of the constraints
Jun
2
comment Cost function for very sparse, real-valued data
induced l1 norm then round the smallest 95% to zero, this might be better migrated to stats stack exchange though
Jun
2
accepted What is the first order approximation to a differentiable function $F:M_{n\times n}(\mathbb{R})\to\mathbb{R}$
Jun
1
revised What is the first order approximation to a differentiable function $F:M_{n\times n}(\mathbb{R})\to\mathbb{R}$
added 6 characters in body
Jun
1
comment What is the first order approximation to a differentiable function $F:M_{n\times n}(\mathbb{R})\to\mathbb{R}$
shouldn't $\epsilon(h)$ depend on $x$ as well?
Jun
1
revised What is the first order approximation to a differentiable function $F:M_{n\times n}(\mathbb{R})\to\mathbb{R}$
added 21 characters in body
Jun
1
revised What is the first order approximation to a differentiable function $F:M_{n\times n}(\mathbb{R})\to\mathbb{R}$
added 1439 characters in body
Jun
1
revised What is the first order approximation to a differentiable function $F:M_{n\times n}(\mathbb{R})\to\mathbb{R}$
added 1 character in body
Jun
1
asked What is the first order approximation to a differentiable function $F:M_{n\times n}(\mathbb{R})\to\mathbb{R}$
Jun
1
comment Derivative of $(\ln x)^e$
$e^{ln(x)}$ is x, this is just the natural log raised to a number.
May
30
comment Why does ${\lambda _i}(A) \ge {\lambda _i}(B)$?
solid fukin answer B, upvotes to the left
May
30
comment Showing $X$ has finite expectation if $Y$ has finite expectation and $P(|X-Y| \leq M ) = 1$
looks good to me