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Josh Chen

Last seen: Today Active since 2020

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  • Knowledgeable Level 3
  • 6 Month Streak
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Answered
Error in Using ROS Topic
Hi Shivam, The topic "/gazebo/ModelState" contains only one "Pose" field, while the topic "/gazebo/ModelStates" that you are us...

ungefär 2 timmar ago | 0

Answered
ROS2 Subscriber Callback Function Arguments for Code Generation
Hello Michael, This is a known issue in code generation with ros2subscriber callback. Sorry about the inconvenience caused by t...

16 dagar ago | 0

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Answered
Generated ROS node from Simulink, does not work on the target ROS device when launching it manually from Linux terminal without Simulink
Hi JF, Other quick things to try are: 1. Check whether the Gazebo world has been reset or not. Sometimes you may need to reset...

24 dagar ago | 0

Answered
Unable to run the simulink on ROS device due to administrative privileges issue
Hello Sandesh, This is a suggested action instead of an error. It should not prevent you from generating a ROS node or deployin...

ungefär en månad ago | 0

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Answered
How to make ROS subscribe block ensure that each message of a customized ROS topic is caught from Gazebo
Hi Hirak, If I understand correctly, you are running the Simulink controller through Simulink simulation instead of code gene...

ungefär en månad ago | 0

Answered
Select Node name created by ROS Toolbox on Simulink at master connection
Hello Jesús, As you may've discovered, the name of ROS node created from a Simulink model is auto generated with the pattern as...

3 månader ago | 0

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Answered
How do I use a ros2 discovery server in matlab
Hi Samuel, I just tried this on my end and it works fine as shown below: sub3 was created with a node when "ROS_DISCOVERY_SE...

3 månader ago | 0

Answered
How to access instance of class in ROS2 subscriber callback?
Hello Kyösti, Using a single object to manage both data and callback for subscriber is feasible. In this case, subscriber callb...

4 månader ago | 0

Answered
ROS toolbox stuck on service call
Hi Kyösti, The code looks correct for me except "res" should probably be "response". But I don't think that is the culprit. I ...

4 månader ago | 0

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Answered
when i creat a ros2 node ,it dosn't work.why 'Input data can only contain ASCII characters' ?
Hello Xin, I tried the same command you posted here on my end and it successfully created a ROS 2 node. As Walter mentioned, t...

4 månader ago | 0

Answered
Incorrect image encoding from ROS and Raspicam
Hello Sebasian, Could you elaborate about what you mean by "VariableSize property from encoding arrey to rgb (1280x960x3)"? I a...

4 månader ago | 0

Answered
Compatibility ros2node with Coder Generation
Hello Michael, You are right. Code generation support for 'ros2node' starts at R2021b. You should be able to use this feature ...

7 månader ago | 0

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Answered
Questions about ros2 call service blocks in simulink
Hello Xiaochen, It is difficult to figure out the culprit from the screenshot of the model. However, I do have some troubleshoo...

7 månader ago | 0

Answered
ROS2: How to generate code without makefile execution using Matlab coder
Hello Marek, Thanks for bringing this to our attention! This is a bug in both ROS and ROS 2 MATLAB code generation. We are curr...

7 månader ago | 0

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Answered
Error in building custom ros messages
Hello Mustafa, Looking at the error message, it seems that the python virtual environment was not been created properly. Could ...

8 månader ago | 0

Answered
Creating Custom ROS2 message types for simulink
Hello Andre, When running "ros2 msg list", are you able to see the custom message you are trying to use? If not, you would need...

8 månader ago | 0

Answered
vision.blobanalysis used in ROS code generation does not support dynamicMemoryAllocation for AllVariableSizeArrays, but needed for ROS code gen
Hello Matthew, Since the "step" function does not want "unbounded" input, one idea that worth trying is to create an empty fixe...

10 månader ago | 0

Answered
Simulink Ros, code generation
Hello Nicolas, In R2019a, not all codes will be generated into the *_ert_rtw folder. Instead, they were packed in the *.tgz fil...

10 månader ago | 0

Answered
WSL2/Docker container/ROS from Matlab in Win10
Hello @Goupil56, The key for enabling the communication between WSL2 ROS and MATLAB/Simulink is to make sure the environment va...

12 månader ago | 0

Answered
Convert Struct to Pointcloud using ROS2
Hello Manuel, The function pointCloud takes 3-D coordinate points as input argument. However, the variable 'a' here in the scre...

ungefär ett år ago | 0

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Answered
Simulink/ROS Publishing pose of a 7 DOF arm using moveit_msgs/MoveGroupActionGoal
Hello Hasan, In Simulink, each string is represented as an array of uint8 values. As so, when assigning string fields in a mess...

mer än ett år ago | 0

Answered
Generate custom ROS messages in Matlab R2021a running on MacOS 11.4 with CMake 3.20.5. Error: Could not find CMake in your system
Hello Sriharsha, This seems to be an issue with MATLAB custom LD_LIBRARY_PATH. To confirm this, could you please try running th...

mer än ett år ago | 1

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Answered
Publishing on a ROS Topic Simulink
Hello Hassan, In Simulink when creating a bus, it requires more information than MATLAB to lock down the message you want to se...

mer än ett år ago | 3

Answered
Fail to create a ROS publisher/ subcriber for individual project
Hi Van, Based on your reply, it did seem that you are missing custom message definition in MATLAB. So MATLAB has a set of prede...

nästan 2 år ago | 1

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Answered
how to run rosinit in Matlab
Hello Van, Based on the error message, it looks like MATLAB cannot find an available python executable on your computer. rosini...

nästan 2 år ago | 2

Answered
How to use String array in a custom Message in Simulink?
Hello David, It seems that the the message you are assigning here is of type "std_msgs/String", have you tried to change the ma...

nästan 2 år ago | 0

Answered
Setup of an /trajectory_msgs/JointTrajectory message in Simulink
Hello Martin, The message trajectory_msgs/JointTrajectory contains variable-length arrays such as the 'Points' here shown on th...

ungefär 2 år ago | 0

| accepted

Answered
Manage Ros Custom Message with Variable-Length array
Hi Marco, For WaypointArray.msg, are you referring to rsm_msgs/Waypoint? It's a bit difficult to see the full picture without ...

ungefär 2 år ago | 0

Answered
How do I enter a string into a ROS message in Simulink?
Hello Harry, Since ROS strings in Simulink have to be fixed-length uint8 array, normally there are two ways of entering a strin...

ungefär 2 år ago | 0

| accepted

Answered
How can I create standalone application while using Robotics System Toolbox's rosgenmsg function?
Hello Dandanakan, It is possible to use custom ROS messages in MATLAB Compiler with the following workaround. Since "rosgenmsg"...

ungefär 2 år ago | 0

| accepted