I’m working on debugging some code that was written using igraph 1.2.11, while in my environment I currently have 1.4.3 (R 4.2.2). In the original code, the function contract.vertices is used to reduce the nodes in the network based on their cluster membership. When I try to find documentation about this function, I get redirected to contract. What is the difference between contract.vertices and contract, if there is any?
contract.vertices is deprecated, and renamed to contract. Use the latter. There is no functional difference.
I strongly recommend upgrading to 2.0.3, which has many bugfixes.