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The datatype std_msgs::Float64 is not the same as a c++ 64 bit float (double). It is a message object that contains a member called data which is a 64bit float type.

To add a std_msgs::Float64 to the velodyne_n vector you'll need to create a std_msgs::Float64 object set it's data member to one of the values from velodynenormal then push_back that object.

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