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The rosrun docs seems to suggest a _ must be prepended to the variable name. Maybe try that? That is, rosrun package_name node_name _parameter:=0.1

The rosrun docs seems to suggest a _ must be prepended to the variable name. Maybe try that? That is, rosrun package_name node_name _parameter:=0.1

Edit: In order to receive the parameter properly, the node handle must also be initalized to access private parameters, e.g.

ros::NodeHandle nh("~");

This also works with multiple "double" parameters

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