[SciPy-User] Size of sparse boolean coo_matrix unexpectedly tiny

DoanVietTrungAtGmail doanviettrung@gmail....
Tue Mar 26 18:37:02 CDT 2013


I created an NxN (N = 10^6) sparse boolean coo_matrix A and randomly filled
it with 200,000 Trues. sys.getsizeof(A) said A took 32 bytes - a thousand
times smaller than I expected. I am new to Scipy, please tell me what's
going on, thanks.

>>> rows = [random.randint(0,999999) for j in xrange(200000)]
>>> cols = [random.randint(0,999999) for j in xrange(200000)]
>>> vals = ones_like(rows)
>>> A = sparse.coo_matrix((vals,(rows,cols)), shape = (int(1E6), int(1E6)),
dtype = bool)
>>> len(vals)
200000
>>> print sys.getsizeof(A)
32
>>>
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