How to print coordinates of a cluster Head and its member nodes in a text file?

Hello

I need to print x,y coordinates of Cluster Head and its member nodes with minimum distance of each member node from CH in a single txt file.

IN Leach protocol CH changes over time. I need to print CH id each time it change.

Minimum distance is calculated using Euclidean distance.

Thanks

[Jan]

Please add more details to allow for an answer.