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1、In this learning session we will use turtlesim to simulate an actual robot. It will teach us necessary parts of a ROS project in a better way. To install the turtlesim simulator you need to give the

If roscd says similar to roscd: No such package/stack 'beginner_tutorials', you will need to source the environment setup file like you did at the end of thecreate_a_workspace tutorial: 用ros

package.xml中函数generate_messages( DEPENDENCIES std_msgs)std_msgs 是一个msg包 ，可以用roscd std_msgs/切换到std_msgs目录，用下面命令rosmsg show *.msg显示msg文件