Function does not work with Import data from Excel

Questions
1

I am busy studying a Mathematica book (from Paul Welling)
I have a formula from his book and I want to apply it to imported data from Excel. Stuck, just refuses to work on the imported data ?
I tried some things but to no avail ? What could be the problem ?

2

I saw too late that I made a typing error in the example : should be "UndirectedEdge"and not “UnDirectedEdge”. But it still doesn’t work.

Thank you for your time
Chiel Geeraert

3

Just writing helps a lot ! I think I overlooked the problem. With the import from Excel quotes are added , so instead of {{ John, Peter}} I get {{“John,Peter”}}. I have to get rid of the quotes ? Any idea ?
Thank you

4

Can you upload the fbook_import2.xlsx file?

5

Well , after a few hours of trying the problem is solved. I didn’t set up correctly in Excel.
I had a list of two columns of names which I want to combine with ‘UndirectedEdges’ In Excel I already concatened the strings and imported them in Mathematica. But what I overlooked is that Mathematica sees the concatenation as one string and not as two separate string.
So I splitted the names over two colums and now the import works as expected.

Thank you for your time,
Chiel Geeraert