新手的我搞了个6N137的仿真，想试试能不能用，结果仿真老是错误 错误文档如下： Circuit: untitled Doing analysis at TEMP = 27.000000 and TNOM = 27.000000 Warning: v: no DC value, transient time 0 value used Warning: singular matrix: check nodes label1 and label1 Note: Starting dynamic gmin stepping Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Warning: singular matrix: check nodes vcc and vcc Warning: Dynamic gmin stepping failed Note: Starting source stepping Warning: singular matrix: check nodes vcc and vcc Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful source step Warning: singular matrix: check nodes vcc and vcc Warning: singular matrix: check nodes vcc and vcc Warning: source stepping failed Transient solution failed - Last Node Voltages ------------------ Node Last Voltage Previous Iter ---- ------------ ------------- u1_2 0 0 v1 0 0 label1 0 0 vcc 0 0 v#branch 0 0 doAnalyses: iteration limit reached tran simulation(s) aborted Error(parse.c--checkvalid): v1: no such vector. ngspice-26 done ![enter image description here][1] [1]: /editor/20160516/57399a4b19fdc.png 我是个新手，该怎么弄这个呢？