We have seen (see 1.1) that a graph in Scilab is represented by a graph list. This list contains everything needed to define the graph, arcs, nodes, coordinates, colors, attributes, width of the arcs, etc.
To create, load and save graphs in Scilab, you can use only Scilab functions, handling graph lists, or you can use the Metanet window. We describe here the first way. For the second way, see 3.