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# Questions tagged [linear-algebra]

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### Comparison of matrix determinant in less than $O(n^2)$

I was reading this question and I think maybe somebody here could help. This is the idea: Given a matrix $M$ of integers, and a number $d$ is there a way to compare the determinant of $M$ and $d$ in ...
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### Laplace's Approximation for graphical models

A question about Laplace's approximation: In Laplace's method, we need to find the mode of a function and take second order Taylor's expansion. The first order term will vanish (since the gradient is ...
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### Is this problem in P: Finding a common key for a collection of systems of equations?

Let $B=\{b_1=g_1,\cdots,b_n=g_n\}$ be a set of binary variables $b_i$ and their corresponding values $g_i \in \{0,1\}$. Let $M=\{\sum_{e \in A}e \;:\; A \subset B\}$, i.e., $M$ is the set of all ...
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### How to use different size features in SVM?

I want to train a support vector machine with some features. The problem is, one of the features is 1-dimensional (only an angle) and the other is an LBP Histogram, an 58-dimensional vector. ...
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### A max-even subset problem

I want to know if there is any polynomial algorithm for the problem, or any NP-completeness result. Given a set $S$ and $m$ subsets $C_1, \dots, C_m$ of $S$, we want to find a non-empty set \$X\...