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Sebastian Castro


MathWorks

876 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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Contributions in
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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...

17 days 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 ...

17 days ago

Solved


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

17 days 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...

17 days 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...

17 days 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...

17 days 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...

17 days 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...

17 days 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...

17 days 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...

17 days 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-...

24 days 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...

24 days 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...

24 days 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...

24 days 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...

1 month 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...

1 month 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...

2 months ago | 2

| 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...

2 months 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...

2 months 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...

2 months ago | 0

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

2 months 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...

2 months 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...

2 months 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 ...

2 months ago | 0

Answered
How to use MATLAB open the baxter robot's cameras?
The joint commands require publishing to the topic, as it's actuators. Cameras are sensors, so they would require subscribing to...

3 months ago | 1

| accepted

Answered
Problem with the .mltbx toolbox file in Matlab 2018a
I think this is because you're trying to install this on a folder that requires admin/root access. Try moving the .mltbx file s...

4 months ago | 0

Answered
Unable to connect rotational elements to lever block in simscape
The Lever block accepts 2 Translational ports, so the Rotational ones won't directly connect. In your diagram, this means you ca...

5 months ago | 0

Answered
Simulink - Constant as an argument to a MATLAB function block
Unfortunately, this is a documented limitation: <https://www.mathworks.com/help/signal/ref/upfirdn.html#d120e192101> (expand ...

5 months ago | 0

Answered
Error in determining the root folder
If you want the name of the current folder >> folderName = pwd; If you want the name of the file containing the MATLAB s...

5 months ago | 0

Answered
What to use for Semantic Segmentation
You can start with premade neural network architectures. The following example does this with the VGG-16 architecture: <https...

5 months ago | 0

| accepted

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