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You can directly assign a std::vector<float> to the float32[] ranges field of the LaserScan message:

sensor_msgs::LaserScan filtered_scan_msg;
std::vector<float> filtered_ranges;
// fill out vector here...
filtered_scan_msg.ranges = filtered_ranges;

Keep in mind that there are a lot of other fileds of the LaserScan message that need to be correclty set - angle_min, angle_max, angle_increment, etc.

For a working C++ example, you can look at laser_scan_splitter.cpp in laser_scan_splitter.