Rylan Schaeffer's user avatar
Rylan Schaeffer's user avatar
Rylan Schaeffer's user avatar
Rylan Schaeffer
  • Member for 5 years, 10 months
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8 votes
3 answers
1k views

Can the derivative of a real function be imaginary?

4 votes
2 answers
913 views

Why are Hermitian matrices called a generalization of real symmetric matrices?

3 votes
0 answers
174 views

Intuition for Polynomial Interpolation Error

3 votes
0 answers
140 views

Online Stochastic Variational Inference for Dirichlet Process Mixture Models

3 votes
1 answer
121 views

Distribution (or Expectation) of Number of Non-Zero Coefficients in L1-Regularized Regression

2 votes
0 answers
165 views

Conditional Distribution of Matrix Normal Distribution?

2 votes
1 answer
138 views

Singular values of uniform random points on hypersphere?

2 votes
1 answer
64 views

Matrix Derivative of Log Gaussian with respect to Reparameterized Covariance

2 votes
0 answers
41 views

Why is the expected gradient of a density not parallel to the expected gradient of the log density?

2 votes
1 answer
255 views

Error in Gilbert Strang Differential Equations 2.1 Fundamental Solution to 2nd Order Differential Equation?

1 vote
1 answer
86 views

Finding Error in Proof Showing Product of Symmetric Positive Definite Matrices is Positive Definite?

1 vote
0 answers
25 views

What effect does linearly projecting a state space to another dimension have on the Jacobian?

1 vote
1 answer
93 views

Under what conditions is the product of a PSD matrix and another matrix itself PSD?

1 vote
0 answers
46 views

Nuclear norm of matrix comprised of points sampled uniformly at random from the hypersphere?

1 vote
1 answer
52 views

Under what kernels and/or conditions does $k(x, x) = k(x, X) k(X, X)^{-1} k(X, x)$?

1 vote
1 answer
281 views

Solving Quadratic Matrix Equation involving Hadamard/Element-wise Product?

1 vote
0 answers
27 views

Finding 2nd Order Linear ODE for known signal of summed oscillators starting at different times?

1 vote
0 answers
33 views

Combinatorics - Closed-Form Expression for Marginal in Chinese Restaurant Process?

1 vote
1 answer
71 views

Combinatorics - Counting Something Similar to Unsigned Stirling Numbers of the First Kind

0 votes
1 answer
210 views

Can gradient descent on covariance of Gaussian cause variances to become negative?

0 votes
1 answer
122 views

Expectation of Quadratic Product of Bernoulli Vector and Gaussian Matrix?

0 votes
0 answers
66 views

Relationship between trace norm (a.k.a. Schatten-1 norm) of a matrix and the vector norm of the matrix's row average?

0 votes
0 answers
9 views

How does the SVD of a matrix relate to the SVD of multiple stacked duplicates of the matrix?

0 votes
1 answer
422 views

Rewriting summation over vector-matrix-vector products as one vector-matrix-vector product?

0 votes
1 answer
217 views

Show that an entirely real, non-negative covariance matrix has a precision matrix with non-positive off-diagonal elements

0 votes
2 answers
681 views

How do singular values of a matrix change when left multiplying by a row vector?

0 votes
1 answer
192 views

Distribution of Column Sums of Orthogonal Matrix?

0 votes
1 answer
234 views

Structure of Column Sums of Real Orthonormal Matrices

0 votes
1 answer
1k views

Proving Convexity of KL Divergence w.r.t. first argument?

0 votes
0 answers
25 views

Distribution Describing Probability That Sum of Multinomial R.V. > threshold?