All Questions
Tagged with performance matrix
176 questions
2
votes
0
answers
73
views
Optimizing even more a C++ matrix class with expression templates using variadic templates
I looked at Bowie Owens' cppcon 2019 talk (the slides can be found here) where he shows how to implement a tridiagonal matrix classes using expression templates but without resorting to the CRTP. (It ...
- 21
5
votes
1
answer
472
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High Performance Matrix Multiplication is not very high speed, why?
I would appreciate a review of the following Rust implementation of high performance matrix multiplication.
After reviewing available literature, including Anatomy of High Performance Matrix ...
- 129
2
votes
1
answer
89
views
Transpose matrix in ANSI C
Is there a way to transpose a matrix in ANSI C way much better than this ANSI C code?
Can I do transpose in a different and ...
- 183
6
votes
1
answer
264
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C++ Eigen/Mex function to perform two pagewise convolutions on a 3D matrix with a simple kernel
I am trying to accelerate an algorithm where I am computing a 2D variance of many complex matrices stored as pages of a 3D array in Matlab. My implementation uses a Mex function with the C++ Matlab ...
- 407
2
votes
1
answer
123
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Matrix led 7x10 with arduino
Good afternoon, a few days ago I finished a personal project of a 7x10 led matrix programmed with the ATMEGA328p microcontroller. To control the matrix I use 2 74HC595 shift registers in cascade in ...
- 103
4
votes
1
answer
427
views
Need for matrix multiplication speed
I need help to make matrix multiplication in C run as fast as
possible. On my AMD Phenom(tm) II X6 1090T, my program multiplies two
square singe precision 4096x4096 matrices in about 6.9
seconds. ...
- 1,384
1
vote
0
answers
80
views
S_n covariance calculation function
I am trying to understand the estimator proposed in ["Multidimensional outlier detection and robust estimation using Sn covariance"][1]. I wrote the code in a basic line-by-line form which ...
- 19
3
votes
1
answer
423
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Cosine similarity calculation in Rust, which is slower than NumPy
I'm running this in release mode. Currently, the following function takes around 6.7 seconds to run on my computer vs 3.7 seconds on Python. I know that Numpy is just calling to C, but I'm trying to ...
0
votes
1
answer
309
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Approximation of the multiplicative matrix inverse (linalg.inv ())
I am trying to compute the multiplicative inverse of a large matrix (~ >40,000x40,000). This can be done with e.g. numpy.linalg.inv or ...
- 103
3
votes
0
answers
67
views
Accelerating this stacked matrix-matrix product in OpenCL
I am trying to compute a matrix-matrix product of N stacked complex double N x N matrices. For simplicity, I assume N = 512. I have written code in C++ parallelized with OMP and using OpenBLAS for the ...
- 31
4
votes
1
answer
196
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Minimize memory allocations while calculating the matrix representation of a Hamiltonian
I am writing a script using Julia (calling my functions from the REPL) to compute the matrix representation of certain Hamiltonian. After I run my script I see that the memory allocations count is ...
- 41
3
votes
1
answer
136
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Python: Create submatrices from long/narrow table and save in HDF5
Hello dear StackExchange Community,
I have written a small program which is doing the following. In short:
it reads in a table in narrow format
creates submatrices from it
saves it in HDF5 format
...
- 85
4
votes
1
answer
207
views
Parallel 3D Discrete Cosine Transformation Implementation in Matlab
I am trying to implement 3D Discrete Cosine Transformation calculation in Matlab with parallel computing parfor. The formula of 3D Discrete Cosine Transformation is ...
- 7,068
1
vote
1
answer
3k
views
Lo Shu Magic Square (Python)
I wrote a python program to find if a matrix is a magic square or not. It works, but I can't help feeling like I may have overcomplicated the solution. I have seen other implementations that were a ...
- 315
4
votes
1
answer
185
views
Optimizing a diagonal matrix-vector multiplication (?diamv) kernel
For an (completely optional) assignment for an introductory course to programming with C++, I am trying to implement a diagonal matrix-vector multiplication (?diamv)...
- 41