Changeset 1849


Ignore:
Timestamp:
Sep 21, 2005, 4:59:07 PM (19 years ago)
Author:
duncan
Message:

comments

File:
1 edited

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  • inundation/pyvolution/sparse.py

    r1848 r1849  
    232232
    233233        Sparse_CSR(A) #creates csr sparse matrix from sparse matrix
     234        Matrices are not built using this format, since it's painful to
     235        add values to an existing sparse_CSR instance (hence there are no
     236        objects to do this.)
     237
     238        Rather, build a matrix, and convert it to this format for a speed
     239        increase.
    234240
    235241        data - a 1D array of the data
    236242        Colind - The ith item in this 1D array is the column index of the
    237243                 ith data in the data array
     244        rowptr - 1D array, with the index representing the row of the matrix.
     245                 The item in the row represents the index into colind of the
     246                 first data value of this row.
     247                 Regard it as a pointer into the colind array, for the ith row.
     248
     249                 
    238250        """
    239251
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