调整ERGM中模拟图形中的节点数

I'm new to Statnet. I'm using ERGM (Exponential Random Graph Model) package to estimate parameters of a large network. Now I wan't to generate networks having the same statistical characteristics but with smaller number of nodes. For the same number of nodes I can use simulate command, but can't find an option for adjusting the number of nodes.I'm new to Statnet. I'm using ERGM (Exponential