# Function to reorder vertices? **URL:** \ **Category:** Usage\ **Tags:** C, Python, R\ **Created:** [29 July 2020 06:53 UTC](https://igraph.discourse.group/t/function-to-reorder-vertices/384 "2020-07-29T06:53:25Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![szhorvat](https://yyz2.discourse-cdn.com/free1/user_avatar/igraph.discourse.group/szhorvat/32/3_2.png) [@szhorvat](https://igraph.discourse.group/u/szhorvat)\ **Post date:** [29 July 2020 06:53 UTC](https://igraph.discourse.group/t/function-to-reorder-vertices/384/1 "2020-07-29T06:53:25Z")
Is there a function that re-orders vertices while preserving vertex and edge attributes? I am primarily interested in the Python interface, but if there is a function, I’d also like to know its name in C and R. I could not find one, but this seems like a fairly fundamental operation, so perhaps I missed it. Example to clarify: Given a directed graph with vertices `0, 1, 2` and one edge `1 -> 2`, permute/rename the vertices as ```auto 0 -> 2 1 -> 1 2 -> 0 ``` to obtain the graph with the edge `1 -> 0`. ---
**Author:** ![tamas](https://yyz2.discourse-cdn.com/free1/user_avatar/igraph.discourse.group/tamas/32/1261_2.png) [@tamas](https://igraph.discourse.group/u/tamas)\ **Post date:** [29 July 2020 09:44 UTC](https://igraph.discourse.group/t/function-to-reorder-vertices/384/2 "2020-07-29T09:44:29Z")
It is called [`igraph_permute_vertices()`](https://igraph.org/c/doc/igraph-Isomorphism.html#igraph_permute_vertices). I think it can also be (ab)used to calculate induced subgraphs or to duplicate vertices and the edges incident on them. Actually, we could probably just delegate the implementation of `igraph_induced_subgraph()` to this function if the user asked to create the new graph from scratch. ---
**Author:** ![szhorvat](https://yyz2.discourse-cdn.com/free1/user_avatar/igraph.discourse.group/szhorvat/32/3_2.png) [@szhorvat](https://igraph.discourse.group/u/szhorvat)\ **Post date:** [29 July 2020 10:15 UTC](https://igraph.discourse.group/t/function-to-reorder-vertices/384/3 "2020-07-29T10:15:03Z")
Thanks! In R: [https://igraph.org/r/doc/permute.html](https://igraph.org/r/doc/permute.html) In Python: [https://igraph.org/python/doc/igraph.GraphBase-class.html#permute\_vertices](https://igraph.org/python/doc/igraph.GraphBase-class.html#permute_vertices) In hindsight, it would have been obvious to search for “permute” (I even used that word in the question) but somehow I didn’t …