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Kuba, Sander, Murray, thank you for your responses. Please browse the attached file. I understand that using "Round" is the correct solution. Best!
Thank you Bill. I am a mathematician. I like the neatness of Mathematica in handling formulas and data structures. For GraphPlot a **list of rules** being a graph is confusing! Moreover, Graph[ {list of rules}] results in a graph is a mess!? What...
I teach in Universita' Ca' Foscari Venezia. I use Mathematica since about 1980. I think it is a wonderful tool for teaching math.