sparse-matrix

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Sparse matrix class with parameterizable "zero"

I am doing some computations on a sparse matrix of floats in the log domain, so the \"empty\" entries are actually -Inf (using -FLT_MAX).I\'m using a custom sparse matrix class right now but I am eage[详细]

2023-04-01 18:14 分类：问答
A way to get the count of non zero values in a coo_matrix of pythons scipy module?

I thought of using coo_matrix.nonzero() which returns a tuple of two arrays which contain the indices of the nonzero entrys in a given matrix. The example from the docs states:[详细]

2023-03-31 14:59 分类：问答
Sparse Matrix implemantation and operations in java

I have to implement sparse matrix and do some decompositions like Cholesky Decomposition, LU Decomposition, QR Decomposition on it.[详细]

2023-03-31 06:11 分类：问答
The most efficient way to store large symmetric sparse matrices in python

I was working on drafting/testing a technique I devised for solving differential equations for speed and efficiency.[详细]

2023-03-31 04:08 分类：问答
Adding values to a matrix using index vectors that include row and column names

Suppose I have a really big matrix of sparse data, but i\'m only interested in looking at a sample of it making it even more sparse.Suppose I also have a dataframe of triples including columns for row[详细]

2023-03-30 07:46 分类：问答
sparse matrix multiplication program openmp

I\'m looking for any standard C program that uses OpenMP APIs for a sparse matrix-vector or matrix-matrix multiplications. Can anyone let m开发者_如何学Goe know if there are any such programs.If you a[详细]

2023-03-28 22:56 分类：问答
performing sum of outer products on sparse matrices

I am trying to implement the following equation using scipy\'s sparse package: W = x[:,1] * y[:,1].T + x[:,2] * y[:,2].T + ...[详细]

2023-03-26 12:01 分类：问答
What is a strided array?

There is also a counterpart which is called de开发者_如何学运维nsity array. What does this mean? I have done some search, but didn\'t get accurate information.Say you have a structure[详细]

2023-03-25 22:46 分类：问答
Is there an efficient way of concatenating scipy.sparse matrices?

I\'m working with some rather large sparse matrices (from 5000x5000 to 20000x20000) and need to find an efficient way to concatenate matrices in a flexible way in order to construct a stochastic matri[详细]

2023-03-23 11:59 分类：问答
Sparse Matrix Libraries for Ruby

I\'m looking for a Sparse Matrix library I can use from Ruby. I\'m currently using the GNU Scientific Library bindings provided by the \"gsl\" gem, but my application would be better optimized if I us[详细]

2023-03-21 13:22 分类：问答