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Sebastian Castro


MathWorks

895 total contributions since 2012

Robotics and AI educator at MathWorks. 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, wine, and heavy metal \m/

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Answered
How do I make an autonomous line following program and also have driver control
Have you seen this new video of ours? https://www.mathworks.com/videos/switching-between-driver-and-autonomous-control-of-vex-r...

11 days ago | 0

Answered
Hor to make a URDF file?
URDF is a file format used externally to MATLAB. It just happens that MATLAB has a URDF importer. Here are the official tutoria...

11 days ago | 0

Answered
Simulink 3D Animation vs. Mechanics Explorer
Simulink 3D Animation requires you to simulate the robot dynamics separately, and then whatever positions you get from your simu...

11 days ago | 1

| accepted

Answered
Robotsimulator is undefined function
That was from a demo, and not a shipping product feature. The closest thing I can think of in the latest version is the basic M...

11 days ago | 0

Answered
I have no 'Build Model' button on my Simulink model Toolbar.
Do you have MATLAB Coder and Simulink Coder in your license? If you type in >> ver in MATLAB, do those toolboxes show up? - ...

11 days ago | 0

Answered
Error using RoboticsPlayground app while running a sample simulation
Do you have a Simscape Multibody license? If you type in >> ver in MATLAB, does that toolbox show up? - Sebastian

11 days ago | 0

Answered
frames not appearing using robotics system toolbox
Maybe the frames have a default size that is much smaller than the robot. If you divide the distance values of the DH parameters...

11 days ago | 0

| accepted

Answered
Mobile Robotics Simulation Toolbox: Map Issues
The toolbox will accept any binaryOccupancyMap or occupancyMap variable as the map (or robotics.BinaryOccupancyGrid and robotics...

11 days ago | 0

Submitted


Using MATLAB with Python
Files demonstrating MATLAB and Python interoperability

15 days ago | 19 downloads |

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Answered
Issue: Create ROS master on Matlab
Two things. First, if all you want to do is create a ROS master on the localhost, all you need is the following rosinit Secon...

2 months ago | 0

Answered
Is it possible to use PRM and sequentially findpath function in Simulink?
It's doable in the sense that you can put the code in a MATLAB Function block (or as a MATLAB Function in Stateflow). It has its...

2 months ago | 0

| accepted

Answered
Simulation Map Generator issues
The error you linked is a common one that happens when you input a grayscale (M x N) image instead of a color (M x N x 3) image....

3 months ago | 1

| accepted

Answered
Trajectory plotting of manipulator path in Simscape
Hi Gautami, Simscape Multibody has a "Spline" block that lets you display a curve if you pass in the XYZ points. You have to di...

4 months ago | 0

Answered
Empty thermal liquid tank
Have you looked into Simscape Fluids? They have a built in Thermal Liquid tank block you can parameterize based on specs like th...

4 months ago | 0

Answered
Feeding knees angle to the walking robot
Thanks for tagging this post with roboticsarena so we got that notification! Much appreciated. In Simscape Multibody, you can c...

5 months ago | 2

| accepted

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...

5 months 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...

5 months 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...

5 months 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...

7 months 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...

7 months 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, ...

7 months 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...

8 months 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 ...

8 months ago

Solved


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

8 months 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...

8 months 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...

8 months 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...

8 months 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...

8 months 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...

8 months 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...

8 months ago

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