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It should be easy to use a std::stringstream to accomplish what you want. Moreover, it might be a bit cleaner to use ROS_INFO_STREAM for this particular application. Something like this:

  std::stringstream ss;
  ss << "Data Retrieved: \n";
  std::copy(data.begin(), data.end(), std::ostream_iterator<double>(ss, " "));
  ss << std::endl;
  ROS_INFO_STREAM(ss.str());

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