SpPy is a fast sparse matrix/array library written in Python and based on the C++ matrix library Eigen. A sparse matrix is one in which many of the elements are zeros, and by storing only non-zero elements, one can often make memory and computational savings over dense matrices which store all elements. The library supports (compressed) sparse matrices, sparse vectors and a number of linear algebra operations. Furthermore, SpPy has a similar interface to numpy so that existing code requires minimal change to work with sparse matrices and vectors.
Update: this project was formerly called sparray.
First, read the installation guide in the reference documentation linked below. More complete documentation is forthcoming, but for now here are some examples
>>> import numpy >>> from sppy import csarray >>> #Create a new column major dynamic array of float type >>> B = csarray((5, 5), storageType="colMajor") >>> B[3, 3] = -0.2 >>> B[0, 4] = -1.23 >>> print(B.shape) (5, 5) >>> print(B.size) 25 >>> print(B.getnnz()) 2 >>> print(B) csarray dtype:float64 shape:(5, 5) non-zeros:2 (3, 3) -0.2 (0, 4) -1.23 >>> B[numpy.array([0, 1]), numpy.array([0,1])] = 27 >>> print(B) csarray dtype:float64 shape:(5, 5) non-zeros:4 (0, 0) 27.0 (1, 1) 27.0 (3, 3) -0.2 (0, 4) -1.23 >>> print(B.sum()) 52.57
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