>>>>> "Eric" == Eric Firing <[EMAIL PROTECTED]> writes:
Eric> fine. But if it (mainly the function option) is something
Eric> that merely might be useful to someone someday, then I
Eric> suggest it be left out until there is a clear need. (My 2
Eric> cents-worth, or less.)
sounds good
Eric> Curiosity questions about implementation:
Eric> 1) What is the "tocoo" method, and what objects have it? 2)
If someone is already using a sparse matrix from scipy.sparse, it's a
lot more efficient to use the sparse matrix functionality than to do
the sparsity check myself
Help on class coo_matrix in module scipy.sparse.sparse:
class coo_matrix(spmatrix)
| A sparse matrix in coordinate list format.
|
| COO matrices are created either as:
| A = coo_matrix(None, dims=(m, n), [dtype])
| for a zero matrix, or as:
| A = coo_matrix((obj, ij), [dims])
| where the dimensions are optional. If supplied, we set (M, N) =
| dims.
| If not supplied, we infer these from the index arrays
| ij[0][:] and ij[1][:]
|
| The arguments 'obj' and 'ij' represent three arrays:
| 1. obj[:] the entries of the matrix, in any order
| 2. ij[0][:] the row indices of the matrix entries
| 3. ij[1][:] the column indices of the matrix entries
|
| So the following holds:
| A[ij[0][k], ij[1][k] = obj[k]
Eric> Is there a reason why one shouldn't simply default precision
Eric> to 0 and use the condition "absolute(asarray(Z)) <=
Eric> precision"?
Minor performance issue since thisapproach requires two passes
through the data whereas mine takes one when precision=None
Eric> One more miscellaneous thought: perhaps spy and spy2 should
Eric> be consolidated into a single function with a kwarg to
Eric> select the marker version or the image version? Their
Eric> purpose is identical (isn't it?), and it would reduce
Eric> namespace clutter.
Fine by me -- if you want to implement it :-)
JDH
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