crating a graph on matlab - using the graph function -

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i trying create graph in matlab, not plot of function actual graph vertex , edges, thing wont let me create graph according examples. doing wrong? there library need install or something?

when try code: 

g1 := graph([1,a,3], [[1,a],[1,3]]): graph::printgraphinformation(g1)

its documentation, gives me error:

undefined function 'g1' input arguments of type 'char'.


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