Is there a data structure in Python that would allow me to do the following:
I have a list of positive integer pairs, say [[1,2], [1,3], [2,5]]. For each pair [i,j] in my list I need to store in memory a number c[i,j] which is a floating point number with some large precision. I'd like to create some sort of object M indexed by the elements of my list so that I can refer to M[i,j] and obtain the number c[i,j]. One way (in the example above) would be to create a 5x5 matrix M and only use its entries with indices [1,2], [1,3], and [2,5] to store my numbers. That way I can refer to M[2,5], M[1,2], M[1,3] and get my numbers back. However, this seems like a very inefficient solution (my list is going to be very long, so this matrix M would be huge, and only a few of its entries used). -- To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
