Writes the sparse or dense array a to a Matrix Market formatted file.
target : file
Matrix Market filename (extension .mtx) or open file object
a : array like
Sparse or dense 2D array
comment : str, optional
comments to be prepended to the Matrix Market file
field : None or str, optional
Either ‘real’, ‘complex’, ‘pattern’, or ‘integer’.
precision : None or int, optional
Number of digits to display for real or complex values.
scipy.io.mmread
scipy.io.FortranFile
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