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Sebastian Castro


MathWorks

880 total contributions since 2012

Education Technical Evangelist at MathWorks, focusing on robotics student competitions.

Co-host of the MATLAB and Simulink Robotics Arena.

Professional Interests: Education, Robotics, Simulation, Controls, Algorithms, Physical Modeling, Model-Based Design, Computer Vision, Machine Learning, Software Engineering

Non-professional Interests: Running, beer, and heavy metal \m/

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Answered
ROS Publish Msg - DJI ROS OSDK
Instead of using a Bus Creator block, use a Blank Message block with the right message type (sensor_msgs/joy), and then use a Bu...

circa 8 ore ago | 0

Answered
No visualisation shown in mechanics explorer
You might want to check that the folder containing the mesh files (the .STL or .STEP) files is on your MATLAB path. Else, the si...

circa 8 ore ago | 0

Answered
In PRM algorithm how much the Minimum number of nodes needs to find the path
You don't! Probabilistic planning approaches have no guarantees, so you just have to pick something that succeeds most of the ti...

circa 8 ore ago | 0

| accepted

Answered
What is the best desktop configuration/parts to run Matlab?
MathWorks has a system requirements page you can look at! https://www.mathworks.com/support/requirements/matlab-system-requirem...

circa 2 mesi ago | 1

| accepted

Answered
Perform Safe Trajectory Tracking Control on Baxter robot
I'd suggest starting by computing the inverse kinematics/dynamics for each arm independently and seeing if you can place both ma...

circa 2 mesi ago | 0

| accepted

Answered
System Identification of MIMO
You can perform System Identification on a MIMO system, as shown in this example. If you already have a model in SimMechanics, ...

circa 2 mesi ago | 0

Solved


Pose from bearing angles in 2D
A robot moving on the plane has a sensor that measures the bearing angle to two mapped landmarks, that is, the world frame coord...

3 mesi ago

Solved


Twists in 2D
So far we have represented the pose of an object in the plane using a homogeneous transformation, a 3x3 matrix belonging to the ...

3 mesi ago

Solved


Pose interpolation in 2D
Consider two poses represented by homogeneous transformation matrices: |T1| and |T2|. Write an algorithm to interpolate between...

3 mesi ago

Solved


Composing relative poses in 2D: problem 2
We consider a world reference frame denoted by {0} which has its x-axis pointing east and its y-axis pointing north. There i...

3 mesi ago

Solved


Composing relative poses in 2D: problem 1
We consider a world reference frame denoted by {0} which has its x-axis pointing east and its y-axis pointing north. There i...

3 mesi ago

Solved


Relative points in 2D: problem 3
The 2D pose of a robot, with respect to a world coordinate frame {O}, is described by a 3x3 homogenous transform matrix T. A la...

3 mesi ago

Solved


Relative points in 2D: problem 2
The 2D pose of a robot, with respect to a world coordinate frame {O}, is described by a 3x3 homogenous transform matrix T. A la...

3 mesi ago

Solved


Relative points in 2D: problem 1
The 2D pose of a robot, with respect to a world coordinate frame {O}, is described by a 3x3 homogenous transform matrix T. A la...

3 mesi ago

Solved


Relative pose in 2D: problem 2
We consider a world reference frame denoted by {0} which has its x-axis pointing east and its y-axis pointing north. There is a...

3 mesi ago

Solved


Relative pose in 2D: problem 1
We consider a world reference frame denoted by {0} which has its x-axis pointing east and its y-axis pointing north. There is a...

3 mesi ago

Answered
Subscribing to a topic with our own defined message type in ROS through Simulink
There is an example in the documentation for setting up custom ROS messages: https://www.mathworks.com/help/robotics/ug/create-...

3 mesi ago | 0

Answered
Path Following for a Differential Drive Robot
Do you mean the exact code that is shown in the documentation page? Because it's all there... https://www.mathworks.com/help/ro...

3 mesi ago | 0

| accepted

Answered
Cannot connect to ROS device
Hi An, Have you installed openssh-server on your Ubuntu machine? This is needed for the tests to succeed, far as I recall. htt...

3 mesi ago | 0

| accepted

Answered
Mobile robotics training toolbox
This means you don't have a Robotics System Toolbox license. If you are able to get one, this issue should be resolved. - Seba...

3 mesi ago | 1

| accepted

Answered
Custom ROS msg type does not get added to rosmsg list even after MATLAB restart
Hi An, Pretty sure the ROS package requires your .msg file to be inside a subfolder called msg. So your folder structure shoul...

3 mesi ago | 2

| accepted

Answered
ROS create PointCloud2 from MATLAB pointCloud
Hello Connor, It's almost been a year since you asked, but I just learned about this question! I've written MATLAB and Simulin...

3 mesi ago | 0

| accepted

Answered
Difference between Simulink Coder and Embedded Coder
Both Simulink Coder generate C code from Simulink models, and both of them can put that C code in a C++ wrapper to be effectivel...

4 mesi ago | 3

| accepted

Answered
arduino uno simulink matlab Simulink does not permit you to modify the MATLAB installation area.
"Please change to a working folder that is not in the MATLAB installation area and re-try the previous command." So... as the e...

5 mesi ago | 0

Answered
Variable resistor in Simscape Specialized Technology
You can build one fairly quickly using the approach discussed here: https://www.mathworks.com/help/physmod/sps/powersys/ug/buil...

5 mesi ago | 0

Answered
is turtlebot 2i also opera table using matlab?
You can control a TurtleBot2 from MATLAB using ROS: https://www.mathworks.com/help/robotics/examples/get-started-with-a-real-tu...

5 mesi ago | 0

Answered
Abc to dq0 transformation
In Simscape Electrical (previously Simscape Power Systems) https://www.mathworks.com/help/physmod/sps/powersys/ref/abctodq0dq0t...

5 mesi ago | 0

Answered
Circular trajectory on Parrot minidrone
If the X trajectory is a sine and the Y trajectory is a cosine, that's a circle! https://www.mathopenref.com/coordparamcircle.h...

5 mesi ago | 0

| accepted

Answered
Custom activation functions for Deep Learning Toolbox?
Sure you can! Here is an example: https://www.mathworks.com/help/deeplearning/ug/define-custom-deep-learning-layer.html - Seba...

5 mesi ago | 0

Answered
Please suggest me how I can stop the charging of battery at 80% by using simulink?
If you open that switch, those 12A of constant current have no choice but to all go into the battery, so it makes sense that it ...

5 mesi ago | 0

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