技术文档MQL5参考矩阵和向量方法特征SizeSizeSize返回向量的大小。ulong vector::Size()返回值 整数。举例matrix m={{1,2,3,4,5,6,7,8,9,10,11,12}}; m.Reshape(3,4); Print("matrix m\n",m); vector v=m.Row(1); Print("v.Size()=",v.Size()); Print("v=",v); /* matrix m [[1,2,3,4] [5,6,7,8] [9,10,11,12]] v.Size()=4 v=[5,6,7,8] */ColsNorm