NARVAL_G_NodeNumber computes the number of nodes n inside the graph g.
Examples
n0=100;l=1000;d=100;[g]=NARVAL_T_LocalityConnex(n0,l,d);//generation of a graphind=1;f=NARVAL_G_ShowGraph(g,ind);[n]=NARVAL_G_NodeNumber(g);//application of NARVAL_G_NodeNumbern