[sage-devel] Re: Problems in the computation of hyperbolicity.

2014-04-23 Thread david . coudert
Dear Miguel, Memory is not the sole limitation here. The main problem is that the worst case time complexity is O(n^4). For instance, it took me several weeks of computation to determine the hyperbolicity of the latest CAIDA maps (2012 and 2013). There is currently no exact algorithm for comput

[sage-devel] Re: Problems in the computation of hyperbolicity.

2014-04-22 Thread leif
Vincent Delecroix wrote: I was a bit wrong with my computations. Have a look at the file SAGE_ROOT/src/sage/graphs/distance_all_pairs.pyx You will see that matrices for distances are implemented as unsigned short (whose maximum is 65535=2^16) while eccentricity is made of int (whose maximum depe