Queries the contents of the Matrix Market file ‘filename’ to extract size and storage information.

Parameters :

source : file

Matrix Market filename (extension .mtx) or open file object

Returns :

rows,cols : int

Number of matrix rows and columns

entries : int

Number of non-zero entries of a sparse matrix or rows*cols for a dense matrix

format : {‘coordinate’, ‘array’}

field : {‘real’, ‘complex’, ‘pattern’, ‘integer’}

symm : {‘general’, ‘symmetric’, ‘skew-symmetric’, ‘hermitian’}

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