sparse-matrix

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Issue converting Matlab sparse() code to numpy/scipy with csc_matrix()

I\'m a bit of a newbie to both Matlab and Python so, many apologies if this question is a bit dumb...[详细]

2023-04-13 01:48 分类：问答
Python left multiplication of of a matrix with inverse of a sparse matrix

I\'m trying to calculate an expression of the form K = P*C.T*S^-1 (implementation of a Kalman filter)[详细]

2023-04-12 20:27 分类：问答
Apply Dijkstra in a real sparse matrix in C#

I Have this code to get \"shortest path\" using Dijkstra but I know a real problem involves sparse matrices (matrix populated primarily with zeros).[详细]

2023-04-11 06:23 分类：问答
slicing sparse (scipy) matrix

I would appreciate any help, to understand following behavior when slicing a lil_matrix (A) from the scipy.sparse package.[详细]

2023-04-10 06:02 分类：问答
Is sparse matrix-vector multiplication available in Simulink/xPC?

I am trying to make my control algorithm more efficient since my matrices are sparse.Currently, I am doing conventional matrix-vector multiplications in Simulink/xPC for a real-time application.I can[详细]

2023-04-09 03:25 分类：问答
efficient computation of Trace(AB^{-1}) given A and B

I have two square matrices A and B. A is symmetric, B is symmetric positive definite. I would like to compute $trace(A.B^{-1})$. For now, I compute the Cholesky decomposition of B, solve for C in the[详细]

2023-04-06 09:03 分类：问答
Accessing the indices of non-zero elements in a UBLAS sparse vector

How can I know the index of the first non-zero element in a sparse_vector in 开发者_运维问答ublas and each subsequent nonzero element as well? The function begin() gives me an iterator that can be use[详细]

2023-04-06 05:56 分类：问答
How to find indices of non zero elements in large sparse matrix?

i have two sq matrix (a, b) of size in order o开发者_运维知识库f 100000 X 100000. I have to take difference of these two matrix (c = a-b). Resultant matrix \'c\' is a sparse matrix. I want to find the[详细]

2023-04-04 06:04 分类：问答
R: Tabulations and insertions with data.table

I am trying to take a very large set of records with multiple indices, calculate an aggregate statistic on groups determined by a subset of the indices, and then insert that into every row in开发者_Py[详细]

2023-04-04 01:44 分类：问答
API that handles boost ublas sparse OR dense matrices

I am a bit perplexed by the Boost ublas documentation.It does not seem clear to me that the sparse and dense matrix classes share a common parent class---which I believe is by design.But then how can[详细]

2023-04-02 00:10 分类：问答