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waitForTransform

Wait until a transformation is available

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waitForTransform will be removed in a future release. Use getTransform with a specified timeout instead. Use inf to wait indefinitely.

Syntax

waitForTransform(tftree,targetframe,sourceframe)
waitForTransform(tftree,targetframe,sourceframe,timeout)

Description

waitForTransform(tftree,targetframe,sourceframe) waits until the transformation between targetframe and sourceframe is available in the transformation tree, tftree. This functions disables the command prompt until a transformation becomes available on the ROS network.

waitForTransform(tftree,targetframe,sourceframe,timeout) specifies a timeout period in seconds. If the transformation does not become available, MATLAB® displays an error, but continues running the current program.

example

Examples

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Open Live Script

Connect to the ROS network. Specify the IP address of your network.

rosinit('192.168.17.129')
Initializing global node /matlab_global_node_48383 with NodeURI http://192.168.17.1:54695/

Create a ROS transformation tree.

tftree = rostf;

Wait for the transformation between the target frame, /camera_depth_frame, and the source frame, /base_link, to be available. Specify a timeout of 5 seconds.

waitForTransform(tftree,'camera_depth_frame','base_link',5);

Get the transformation.

tform = getTransform(tftree,'camera_depth_frame','base_link');

When you are finished, disconnect from the ROS network.

rosshutdown
Shutting down global node /matlab_global_node_48383 with NodeURI http://192.168.17.1:54695/

Input Arguments

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ROS transformation tree, specified as a TransformationTree object handle. You can create a transformation tree by calling the rostf function.

Target coordinate frame, specified as a string scalar or character vector. You can view the available frames for transformation by calling tftree.AvailableFrames.

Initial coordinate frame, specified as a string scalar or character vector. You can view the available frames for transformation using tftree.AvailableFrames.

Timeout period, specified as a numeric scalar in seconds. If the transformation does not become available, MATLAB displays an error, but continues running the current program.

Extended Capabilities

Version History

Introduced in R2019b

See Also

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