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In this document: https://docs.ros.org/en/foxy/Concepts...
It mentions the following
Parameters are addressed by node name, node namespace, parameter name, and parameter namespace. Providing a parameter namespace is optional.
What exactly is a "parameter namespace"? I can't seem to find any other references to a parameter namespace in ros2.
A parameter namespace can be set when declaring a new parameter, e.g. in Python:
self.declare_parameters(
namespace="ns",
parameters=[("bar", "default_value")],
)
You can then get a parameter in this namespace with:
bar = self.get_parameter("ns.bar")
The namespace can also be seen as parameter prefix, thus all parameter within a specific namespace can be retrieved with:
ns_params = self.get_parameters_by_prefix("ns")
Thanks! I actually forgot I had asked this question. At the time I believe I was confused about why you'd need parameter namespace in addition to the node namespace. I guess it's just another option for organizing node parameters in ROS2. Here's the CPP docs for the same declare_parameters function in case anyone is interested: https://docs.ros2.org/foxy/api/rclcpp... It has some detail on parameter namespaces.
Asked: 2021-12-09 09:39:36 -0500
Seen: 1,390 times
Last updated: Dec 09 '21
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