why degree_seq.double_edge_swap(G) gives error?

[Fariba]

Hi!

For swapping edges between vertices in a network, so far I use
nx.generators.degree_seq.double_edge_swap(G,nswap=edges_size) and it
worked.

However recently it keeps giving me unexpected error :
networkx.exception.NetworkXAlgorithmError: Maximum number of swap
attempts (1001) exceeded before desired swaps achieved (122369).

Since My code was working before, I suspect that something has changed
either in libraries or on my work station.

Have you encountered this problem as well? And how I can fix it?

[Dan Schult]

There are two arguments to the double_edge_swap function controlling the
number of swaps and the number of attempted swaps.
See the docstrings, or:
http://networkx.lanl.gov/reference/generated/networkx.algorithms.swap.double_edge_swap.html

Dan

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[Federico Vaggi]

Dan - I looked at the code for the double_edge_swap function.

Is it worth to make the function automatically raise an error if
nswaps < number of attempted swaps ?

On Mar 27, 5:04 pm, Dan Schult <dsch...@colgate.edu> wrote:
> There are two arguments to the double_edge_swap function controlling the
> number of swaps and the number of attempted swaps.

> See the docstrings, or:  http://networkx.lanl.gov/reference/generated/networkx.algorithms.swap...

[Dan Schult]

On Mar 28, 2012, at 8:41 AM, Federico Vaggi wrote:
> Dan - I looked at the code for the double_edge_swap function.
>
> Is it worth to make the function automatically raise an error if
> nswaps < number of attempted swaps ?

I created a ticket for this enhancement:
https://networkx.lanl.gov/trac/ticket/709
Hopefully will fix it later today.