Eigen reshape问题

      MatrixXf M1(3,3);
      M1<<1,2,3,4,5,6,7,8,9;
      cout<<"M1:"<<endl<<M1<<endl;
      Map<RowVectorXf> v1(M1.data(),M1.size());
      cout<<"v1:"<<endl<<v1<<endl;
    
    
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      RowVectorXf v3=RowVectorXf::LinSpaced(20,0,19);//20个数据，0-19
      cout<<"v3"<<endl<<v3<<endl;
      //cout<<"v3"<<endl<<v3.innerStride(2)<<endl;
      Map<RowVectorXf,0,InnerStride<2> > v4(v3.data(),v3.size()/2);
      //InnerStride<2> 内存步幅值为2（默认为1） v4(数据，大小)
      cout<<"v4"<<endl<<v4<<endl;
    
    
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