var模型变量和被解释变量有13个，前面步骤都完成了，脉冲响应分析就出来169个图，然后我进行方差分解就显示no room to add more variables    Up to 3,000 variables are currently allowed, although you could reset the maximum
    using set maxvar; see help memory.

不知道该怎么办了 用了set maxvar 20000和set max_memory 30000都不行，怎么能够扩大一点容量，运行方差分解这步啊 球球各位大神帮帮忙