在做郑建荣编著的《ADAMS——虚拟样机技术入门与提高》208页的曲柄滑块机构的例子,施加滑块作用力的时候,修改力对话框为SIGN( 10000 , -VX( .pistonpump.piston.MAR_13 ))
则有警告如下:
WARNING: Function text : "SIGN( 10000 , -VX( .pistonpump.piston.MAR_13 [[)]] )"
WARNING: (The element at or immediately after the error is
WARNING: enclosed in double brackets '[[' and ']]'.)
这是怎么一回事?