[SciPy-User] indexation of sparse matrices

Dmitrey tmp50@ukr....
Sun Dec 13 07:44:52 CST 2009


hi all,  
suppose I have a scipy.sparse matrix A and positions of elements to be extracted I = (2,3,4), J = (0,1,5).  
how can I get vector val (Python list or numpy array) that contains the elements A[2,0], A[3,1], A[4,5]?  
I haven't found it in scipy.sparse doc.  
  
And, if anyone knows, how can I get it from dense numpy array A?  
  
Thank you in advance, D.  
  
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