igraph - How to compress rows to a binary list in R? -

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i have list of page visits session id. need modify list of 2 pages each, repeating across list until used. id duplicated down new rows. need keep prior node go new one.

i want turn this:

session page id1     home id1     inventory id1     details id1     home id2     inventory id2     home id2     details id2     inventory id3     inventory id3     details id4     details id4     inventory id4     details id4     inventory id4     details id4     inventory id4     details id4     inventory id4     home

into this:

session node1       node2 id1     home        inventory id1     inventory   vehicles id1     vehicle     home id2     inventory   home id2     home        vehicle id2     vehicle     inventory id3     inventory   vehicle id4     vehicle     inventory id4     inventory   vehicle id4     vehicle     inventory id4     inventory   vehicle id4     vehicle     inventory id4     inventory   vehicle id4     vehicle     inventory id4     inventory   home

the ultimate goal feed igraph network diagram of activity. there can many 44 different page visits in session if meaningful.

assuming vehicle details, , data stored in mydata

library(data.table) setdt(mydata) mydata[, node2 := page[.i + 1]] mydata[, t := session[.i + 1]] mydata[session == t, list(session,node1 = page,node2)]

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