Thank you Gábor. That solved the problem. It was due to R Commander. I was first working in the terminal but it was behaving strangely when pasting long texts into it (the text was overwriting itself), so I switched to R Commander. Apparently it does not load the methods package by default. However, is.matrix( adjm ) did work before loading methods... rather confusing, unless it belongs to another package of course ;)
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