Can't run rxgraph on remote slave computer when connect to pr2

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How can I open a window when I ssh to the robot in the terminal? My current method is to use multi- machine and try to open rxgraph in the slave computer, but failed.

With X-forwarding, you can run gui applications through ssh when you use X-forwarding. Please read the support page and be more specific. What did you set ROS_HOSTNAME and ROS_MASTER_URI to and on which computers. Which errors did you get.

After connect my laptop to PR2's LAN, I type:(in laptop)

export ROS_MASTER_URI=http://10.68.0.1:11311

export ROS_HOSTNAME=10.68.0.142(get from ifconfig)

And then I try to open rxgraph in my laptop, the window of rxgraph remains "initializing".

Don't set ROS_HOSTNAME but ROS_IP. I doubt that this is the cause of the problem though. Try rosnode list and try executing rosnode info <node name> on one of the listed nodes to verify that your network connection is really working.