Hello everyone!

I have a distance matrix; https://ibb.co/h2vCbyt

And I want to perform UPGMA algorithm step by step. I know there's a function for that already but I want to learn better.

So the point is I want to find the coordinates of minimum value and calculate the average for each distances.

i.e.;

Minimum value in here is : A - B = 1. So I have to connect these two together to do end-joining. So the updated matrix will contain AB vs all. Like from AB to C is going to be (AB+C)/2 which is 12+13/2=12.5. Until there's only one node -> 0 is left. This will mean all the nodes are connected to each other.

In sum, the output will look like this: https://ibb.co/C9GnYs7

Then I'm going to plot a dendrogram which is a piece of cake...

When I try to merge AB, R doesn't calculate the average or vise versa. I don't know what to do and I want to understand the language of R. I do it in python or manually on paper -:)- but in R it's driving me crazy for like more than a week and I didn't know what to do except asking you.

Can you please help me? I'm new in R and I'm so curious about it as well and trying to learn it all by myself. It's an easy thing but I'm having a brain freeze.