linear-algebra

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Calling MATLAB's built-in LAPACK/BLAS routines

I want to learn how to call the built-in LAPACK/BLAS routines in MATLAB. I have experience i开发者_JS百科n MATLAB and mex files but I\'ve actually no idea how to call LAPACK or BLAS libraries. I\'ve f[详细]

2023-03-15 02:01 分类：问答
Creating a matrix from vectors in C++ with uBLAS

If I开发者_如何学编程 have n vectors of length m and want to join them to create an mxn matrix, what is the most efficient way to do this in C++ using Boost uBLAS?[详细]

2023-03-14 13:12 分类：问答
Compute Covariance Matrix in Java

I want to calculate covari开发者_C百科ance matrix using Java. Is there any free library to compute covariance Matrix in Java?Here is a short example, how you can create it with Apache Commons Math (3[详细]

2023-03-14 04:49 分类：问答
uBLAS Slow Matrix-SparseVector Multiplication

I\'m converting some of my own vector algebra code to use the optimized boost uBLAS library. However, when I tried to do a SymmetricMatrix-SparseVector multiplication I found it to be about 4x slower[详细]

2023-03-13 03:02 分类：问答
How to make prediction with PCA

I have been able to calculate the eigenvectors/values of my data sample (N samples of dimension M) and I would like to reduce the dimension to say 3. If i am correct i need to choose the first 3 eigen[详细]

2023-03-12 10:13 分类：问答
Concurrent Access Sparse Matrix in Java

I\'m looking for a matrix / linear algebra library in Java that provides a spar开发者_如何学Gose matrix that can be written to concurrently from different threads.Most of the libraries I\'ve come acro[详细]

2023-03-10 00:38 分类：问答
Assumptions in Mathematica's NullSpace Command for Symbolic Matrices

When executing Mathematica\'s NullSpace command on a symbolic matrix, Mathematica makes some assumptions about the variables and I would like to know what they are.[详细]

2023-03-09 19:43 分类：问答
square to trapezoid

I know that transforming a square into a trapezoid is a linear transformation, and can be done using the projective matrix, but I\'m having a little trouble figuring out how to construct the matrix.[详细]

2023-03-09 01:54 分类：问答
Sample from multivariate normal/Gaussian distribution in C++

I\'ve been hunting for a convenient way to sample from a multivariate normal distribution.Does anyone know of a readily available code snippet to do that?For matrices/vectors, I\'d prefer to use Boost[详细]

2023-03-08 11:08 分类：问答
Matrix logarithm algorithm

is there any way to compute the matrix logarithm in OpenCV? I understand that it\'s not available as a library function, but, pointers开发者_如何学Go to a good source (paper, textbook, etc) will be ap[详细]

2023-03-08 07:45 分类：问答