[igraph] graph.union does not unify as expected

[Hermann Norpois]

Hello,

I was playing around with graph.union.

I did a copy of my graph g

gg -> g

gu  -> graph.union (gg, g)

I expected a graph identical to g (or gg) but this was not the case.

The same should be the case for

gi -> graph.intersect (gg,g)

And it doesnt work for weighted graphs?

Thanks Hermann

dput (g)
structure(list(9, FALSE, c(6, 2, 7, 8, 7, 5), c(0, 1, 1, 1, 2,
3), c(1, 5, 0, 2, 4, 3), c(0, 1, 2, 3, 4, 5), c(0, 0, 0, 1, 1,
1, 2, 3, 5, 6), c(0, 1, 4, 5, 6, 6, 6, 6, 6, 6), list(c(1, 0,
1), structure(list(), .Names = character(0)), structure(list(
    name = c("16052361", "16052513", "16052618", "16052962",
    "rs11703994", "rs62224614", "rs78724352", "rs3013006", "rs55926024"
    ), x = c(16052361L, 16052513L, 16052618L, 16052962L, 16053791L,
    16053862L, 16053863L, 16054667L, 16054740L), y = c(2.156147,
    2.547104, 1.587586, 4.037532, 3.734964, 5.026869, 2.514876,
    1.543943, 0.579408)), .Names = c("name", "x", "y")), structure(list(
    weight = c(0.526203, 0.725426, 0.681783, 0.579408, 0.86216,
    0.718093), color = c("grey", "blue", "grey", "grey", "red",
    "blue")), .Names = c("weight", "color")))), class = "igraph")
>