Bipartite adjacency matrix with no rows and no columns:
directed: true
vcount: 0
edges: {
}
types: 
Bipartite adjacency matrix with some rows and no columns:
directed: true
vcount: 3
edges: {
}
types: 0 0 0

Bipartite adjacency matrix for two vertices:
directed: true
vcount: 2
edges: {
0 1: 1.25
1 0: 1.25
}
types: 0 1

Bipartite adjacency matrix for five vertices:
directed: true
vcount: 5
edges: {
0 3: -4.5
0 4: 2.3
1 2: -0.1
2 1: -0.1
3 0: -4.5
4 0: 2.3
}
types: 0 0 1 1 1

Same graph, IGRAPH_OUT:
directed: true
vcount: 5
edges: {
0 3: -4.5
0 4: 2.3
1 2: -0.1
}
types: 0 0 1 1 1

Same graph, IGRAPH_IN:
directed: true
vcount: 5
edges: {
2 1: -0.1
3 0: -4.5
4 0: 2.3
}
types: 0 0 1 1 1

Same graph, undirected:
directed: false
vcount: 5
edges: {
0 3: -4.5
0 4: 2.3
1 2: -0.1
}
types: 0 0 1 1 1

Infinity and NaN:
directed: false
vcount: 5
edges: {
0 4: -4.5
1 3: Inf
1 4: -Inf
2 3: NaN
}
types: 0 0 0 1 1
