# Questions tagged [matrix-multiplication]

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### Is there a polynomial sized arithmetic formula for iterated matrix multiplication?

I found an article on Catalytic space which describes how additional memory (which must be returned to it's arbitrary, initial state) can be useful for computation. There's also an expository follow ...
9 views

### Why is the weight matrix diagonal in weighted least squares regression?

I was going through the theory for weighted least-squares fitting and I understood its basic underlying concepts, but I couldn't understand why exactly do we keep the weights as a diagonal matrix ...
776 views

### What is the intuition behind Strassen's Algorithm?

I came across Strassen's algorithm for matrix multiplication, which has time complexity $O(n^{2.81})$, significantly better than the naive $O(n^3)$. Of course, there have been several other ...
7 views

### Lower bounds for orthogonal matrix multiplication

Is it possible, according to the current state of knowledge, that orthogonal matrices can be multiplied faster than arbitrary matrices? More precisely, let $T(N)$ denote the worst-case time of the ...
53 views

### Is this benchmark sufficient to consider my algorithm as an efficient matrix multiplication algorithm?

I built a matrix multiplication algorithm and now I need some thoughts about following benchmark. C++ chrono:: high resolution clock Time(micro second) (Dim)256--> (Naive algo ) 296807, (My algo) ...
25 views

### How can follow this this guide to construct a graph with matrix/reachability

Let's we have k matrices. For example we have 3 now, where first one is 8x5 ($a_1$ x $b_1$), second one is 5 x 6 ($a_2$ x $b_2$) and last one is 6 x 8 ($a_3$ x $b_3$). And our goal is to figure out ...
44 views

### In a LP problem Ax = b, how to solve for A instead of x?

I have a multi-objective linear programming problem of the form Ax = b, where A is a matrix and x and b are vectors. x is known, and I'm looking to minimise each row of b by solving for A. Constraints ...
Let us say I am given an algorithm that calculates the transitive closure of a given graph $G = \{ V, E \}$. How can I use this algorithm in order to perform the Boolean Matrix Multiplication of two ...