Community Profile

photo

Sebastian Castro


MathWorks

852 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/

Sebastian Castro's Badges

  • Thankful Level 1
  • 12 Month Streak
  • Guiding Light
  • Revival Level 3
  • Knowledgeable Level 4
  • First Answer
  • Modeling And Simulation Challenge Master
  • Commenter
  • Leader
  • Solver

View details...

Contributions in
View by

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...

5 days 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...

1 month 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 ...

1 month 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...

1 month 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...

1 month ago | 0

| accepted

Answered
Defining time on Ev3 Robot in matlab
If you're using the MATLAB - LEGO interface, then you're not really deploying any code, right? If so, then I would recommend usi...

1 month ago | 0

Answered
Measurement data as source for Simulink model
Try a "From Workspace" block: <https://www.mathworks.com/help/simulink/slref/fromworkspace.html> Or in general, you can e...

1 month ago | 0

Answered
Is it possible to pass outputs from one model to be the inputs of another model using simulink?
You could try model referencing to connect these two models inside one bigger "parent" model. It's a very common thing when you ...

1 month ago | 1

| accepted

Answered
please what are the names of the different types of neural network available in matlab?
There are for sure Convolutional and Recurrent Neural Networks in release 2018b of MATLAB. * Convolutional: <https://www.math...

1 month ago | 0

Answered
This function does not fully set the dimensions of output port 2 error in matlab?
Hi Najmeh Eskandari, I would highly recommend running this code in MATLAB and debugging it yourself. I just did the same and ...

1 month ago | 0

| accepted

Answered
i made a quarter car suspension using simulink . but the output is always 0. why? i need help!
You either need a forcing function or some nonzero initial conditions in the Integrator blocks... otherwise, you should expect t...

1 month ago | 1

| accepted

Answered
Converting double array to struct array for generalized inverse kinematics
Instead of converting back and forth, it's easier to stick to a consistent format -- either all structs or all numeric. If yo...

1 month ago | 0

Answered
show command from robotics
Yes -- you have to disable the |PreservePlot| property as follows: show(robot,qWaypoints(k,:)','PreservePlot',false); - ...

1 month ago | 0

Answered
How can i send image using UDP in Matlab code ?
If you have Instrument Control Toolbox, you can use this functionality: <https://www.mathworks.com/help/instrument/tcp-ip-and...

1 month ago | 0

| accepted

Answered
how to create topic ?
With |rospublisher|: <https://www.mathworks.com/help/robotics/ref/robotics.publisher.html> - Sebastian

1 month ago | 2

Answered
Why should I choose matlab deep learning toolbox over other opensource frameworks like caffe, onnx, pytorch, torch etc?
This is a fun and tough question... *DISCLAIMER: Even though I currently work at MathWorks, I am answering with my personal o...

2 months ago | 5

Answered
import robot as a rigidbody tree from simscape model
Actually, if you look at the Robotics System Toolbox release notes, the ability to use |importrobot| on a model is only out in R...

2 months ago | 0

| accepted

Answered
Trouble Coding Kinematics Problem
You probably want to convert from degrees to radians, since the |sin| and |cos| functions accept radians. That, or you can us...

2 months ago | 0

| accepted

Answered
Plotting quadratic f(t) = t^3
Yes. % 1001 samples from -2pi to 2pi t = linspace(-2*pi, 2*pi, 1001); % Element-wise multiplication f = t.^3; ...

2 months ago | 1

| accepted

Answered
How do I import XACRO files as Rigid Body Trees in Robotics System Toolbox?
You can use the ROS |xacro| utility to convert your XACRO files to URDF before importing into MATLAB. In a ROS enabled termin...

2 months ago | 0

Question


How do I import XACRO files as Rigid Body Trees in Robotics System Toolbox?
I am trying to import a robot description model from a XACRO file as a Rigid Body Tree from Robotics System Toolbox. robot ...

2 months ago | 1 answer | 0

1

answer

Answered
How can i use color image segmentation using threshold base edge detection improving through weiner filter and hormonic filter?
Hi Muhammad, Without knowing the exact problem you're facing, here are some general resources to help you get started. * ...

2 months ago | 0

| accepted

Answered
hi sebastian, how i can choice spring stiffness and damping coefficient of the motor for walking robot?
The email answer here for reference, in case others run into this question: There are actually two sources of stiffness and d...

2 months ago | 0

Answered
Linearization problem in Simulink
Do you also have the "Known" checkbox enabled in the "Inputs" tab? Because if so, you should uncheck either that one or the outp...

2 months ago | 0

Answered
How to limit the revolute joint
The solution you presented is correct -- if you use the Simscape Multibody Multiphysics Library, you can apply a penalty torque ...

2 months ago | 0

Answered
Why switch in the attached simulink file not working?
This seems right. The open switch behaves as a large resistor, so voltage should be (almost) the same as the DC voltage supply, ...

2 months ago | 0

| accepted

Answered
No action when using Simulink ROS Publish block
In the Simulink-ROS interface, all arrays are treated like C arrays. You need both the content and the length of the array to su...

2 months ago | 0

| accepted

Answered
ROS Gazebo vision.BlobAnalysis Error
Are you trying this in a version earlier than R2016b, by any chance? If so, replace the problematic line with: [centroid...

3 months ago | 1

| accepted

Answered
matlab guide to operate turtlebot 3
TurtleBot3 just uses ROS, so if you're not familiar with ROS you can look at some "getting started" content on MATLAB and ROS. ...

3 months ago | 0

Answered
How to estimate the Euler Angles (or the corresponding homogeneous 4x4 tform) by use of a known 3x3 projective tform?
Assuming the projective2d transform is doing a rotation about Z and translation about XY, you can probably do the following: ...

3 months ago | 0

Load more