[igraph] average local transitivity

[Raigo Aljand]

Hello,

I have a simple question. I looked at the archives, but it doesn't seem 
anyone has asked this nor does it seem to be written in the documentation.

Why do these two give me different results?

transitivity(graph, type = "average")
0.3772343
mean(transitivity(graph, type = "local"), na.rm = TRUE))
0.2014909

I understand the difference between global and local transitivity and 
what I read from the internet type="average" should give me the average 
local transitivity. Then why does the igraph average give me a different 
result from when I calculate the average with R. What is also strange is 
that type="average" is either no longer or has never been documented in 
the official documentation.

If it helps, my graph is directed, but as I understand it, igraph 
ignores the direction of the edges.

My version of igraph is Ubuntu 18.04 package r-cran-igraph with version 
1.1.2 and R is from the package r-base with version 3.4.4

Thank you for your help.