user avatar
user avatar
user avatar
user2987
  • Member for 9 years, 5 months
  • Last seen more than 2 years ago
17 votes
2 answers
13k views

Is the trace of inverse matrix convex?

5 votes
0 answers
212 views

Set geometry and inclusion

4 votes
1 answer
478 views

Convexity of $\mathrm{trace}(S) + m^2\mathrm{trace}(S^{-2})$

4 votes
3 answers
4k views

square root of a real matrix

4 votes
2 answers
490 views

Derivative of the off-diagonal $L_1$ matrix norm

3 votes
1 answer
265 views

How to construct non-square isometry matrix

3 votes
2 answers
121 views

What is the derivative of $\mathrm{trace}((S^T S)^{-2})$ w.r.t. $S$

3 votes
1 answer
1k views

Projection Matrix onto null space of a vector

2 votes
3 answers
2k views

How to Project onto the Unit Simplex as Intersection of Two Sets (Optimizing a Convex Function)?

2 votes
1 answer
151 views

Find the three closest surrounding neighbors from a data

2 votes
0 answers
201 views

Lagrange multiplier expression

2 votes
1 answer
1k views

What is the derivative of the ReLu of a Matrix with respect to a matrix

2 votes
2 answers
932 views

Generate a semi-unitary matrix

2 votes
1 answer
312 views

Uniqueness of the cube root of a symmetric positive definite matrix

2 votes
0 answers
1k views

Is the composition of trace inverse and convex matrix product convex?

2 votes
1 answer
2k views

Schur complement condition for positive definiteness still for complex matrices

2 votes
1 answer
798 views

how to compute matrix polar decomposition of a non square matrix

2 votes
0 answers
875 views

Gradient Descent with nonlinear constraint on Symmetric positive definite matrix space

2 votes
0 answers
147 views

The space spanned by the rows of the Kernel matrix.

1 vote
1 answer
1k views

proof of positive semi-definiteness of the precision matrix (inverse of the covariance matrix)

1 vote
0 answers
56 views

Can we express a SPD matrix $S$ in terms of $S^{2}$ in a different manner to solve a convex problem?

1 vote
0 answers
500 views

How to check the convexity of a constrained set

1 vote
0 answers
589 views

quadratic form of trace_inverse of symmetric positive definite matrix

1 vote
1 answer
649 views

what is the covariance matrix for deterministic signal+normal noise

1 vote
1 answer
484 views

Approximate model of a convex/concave surface

1 vote
0 answers
344 views

Proof and correctness of the projected gradient descent

0 votes
1 answer
199 views

Can we say something about the rows of the null space matrix

0 votes
1 answer
160 views

Estimation of Quadratic form parameters and convexity/concavity surface

0 votes
1 answer
585 views

Derivative of a trace with respect to a scalar

0 votes
1 answer
888 views

How to generate an observation matrix from its covariance matrix