First variable in table must be a 2-column numeric array or a 2-column array (cell or string) of node names. Duplicate edges not supported. Duplicate definition of EndNodes. Use two inputs, or remove variable EndNodes from EdgeTable. Edge ({0}, {1}) is already in the graph. Invalid data type. Weight must be double or single. Node IDs must both be numeric vectors, both be node names (specified as string vectors, character vectors, or cell arrays of character vectors), or both be categoricals. Numeric node IDs must be positive integers. Input graph not modified. Use an output argument to return the modified graph. Unable to add weighted edges to an unweighted graph. Weights argument must have an element for each specified edge, or can be a scalar. Must specify weights when adding an edge to a weighted graph. First variable in table must be EndNodes. Edge table must be the last argument. Edge table must have at least one column.