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Sebastian Castro


MathWorks

804 total contributions since 2012

Education Technical Evangelist at MathWorks, focusing on robotics student competitions. Formerly a Training Content Developer for modeling and simulation.

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

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Answered
when can I use a atomic subsystem in simulink model? (At what conditions we can use atomic subsystem in a model)
Virtual (or non-atomic) subsystems are simply a visual convenience, but Simulink treats the subsystems as if all the blocks exis...

2 months ago | 1

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Answered
Simulink Library Browser doesn´t show any blocks
Maybe your MATLAB install's path or toolbox cache got corrupted. If you try run the following commands in MATLAB and try opening...

3 months ago | 2

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Answered
How to form a simulink block for MATLAB code ?
There is a MATLAB Function block you can use to insert your code in there: <https://www.mathworks.com/help/simulink/ug/creati...

3 months ago | 0

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CAN bus unpack Big Endian Format
Hi Kyriakos, If you look at the <https://www.mathworks.com/help/vnt/ug/canpack.html block documentation>, you will see a diag...

3 months ago | 1

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Answered
How to create time varying inertia with Simscape Multibody?
EDIT: Variable solid blocks have been released in R2017b. _OLD ANSWER BELOW_ That object has fixed moments of inertia, so ...

3 months ago | 0

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Algebraic loop: PID control DC motor in Simscape
Check out this blog post -- I think it sums up pretty well how to address algebraic loops with continuous dynamics (like that PI...

3 months ago | 1

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Answered
How to translate a body in +Y direction?
You can use a Rigid Transform block to re-orient the Z axis before the Prismatic Joint block, so it is in the direction you want...

3 months ago | 0

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Answered
How to switch between plant on simulink
If all your plant models are linear, you could use a Linear Parameter-Varying (LPV) system. <https://www.mathworks.com/help/c...

3 months ago | 0

Answered
Plotting each iteration of a while loop
The easiest thing would be to use the |hold| command to prevent the plot being overwritten every time you call |plot|. The gener...

3 months ago | 0

Answered
How to create ROS message header time stamp?
I got this working with 2 updates. 1. The error message you have is because the ROS time object is being returned as this |mx...

3 months ago | 0

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Answered
Mapping and Navigation in Matlab
Have you seen the examples online? Building a map from sensor data, having known poses: <https://www.mathworks.com/help/robot...

3 months ago | 0

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Simulink parameters for Sensitivity Analysis
For Sensitivity Analysis to pick up a parameter, it needs to be a variable. For example, if you define myParam = 2; and ...

4 months ago | 0

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Answered
Cloud you help me.please (Detect pumpkin)
Have you tried using the Color Thresholder App? <https://www.mathworks.com/help/images/image-segmentation-using-the-color-the...

4 months ago | 0

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Why use intermediate terms in Simscape?
There is an efficiency/memory vs. traceability difference. If you defined |Re| explicitly as an intermediate variable, you ne...

4 months ago | 0

Answered
How to set parameters in Simulink outside of the Mask Initailize
How about the Model preload callback? The images in this blog are old, but things still work this way: <https://blogs.mathwor...

4 months ago | 0

Answered
Simulink of PWM-controlled dc motor
You need a Voltage Sensor block (connected in parallel). Then, the output of that block will connect to your PS-Simulink Convert...

4 months ago | 0

Answered
Using vision.Cas​cadeObject​Detector on Simulink
The issue here is that the |step| method of |vision.CascadeObjectDetector| can return a variable number of bounding boxes, from ...

4 months ago | 0

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Answered
Direct duty cycle control in MPPT
Yeah, the problem here is you're measuring Vdc incorrectly. Vdc isn't the measured DC link voltage on the output side... it's...

4 months ago | 0

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Answered
Set Parameter Block from Robotics System Toolbox doesn't change parameters in Gazebo. How should I make it work?
This is unfortunately not a MATLAB/Simulink specific problem. I have tried the same approach from a Linux terminal, where I ...

4 months ago | 0

Answered
ros subscriber is interrupted by ginput
This is expected, sorry to say. Recall that the MATLAB environment is single-threaded, with the exception of optimized math f...

4 months ago | 0

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Why my topic only send once?
This is because all the blocks (Blank Message and Constant) are using a "Constant" sample time. This means they will only update...

4 months ago | 0

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ROS stand alone node
You should be able to use |rosdevice| for this. <https://www.mathworks.com/help/robotics/ref/rosdevice-object.html> You ca...

4 months ago | 0

Answered
Call External C Function From Stateflow
If you go to the Model Configuration Parameters, there is a "Simulation Target" section where you specify the source files, head...

4 months ago | 0

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How matlab coder, simulink coder and embedded coder dependent on each other?
MATLAB Coder is needed to use Simulink Coder. Both are then needed to use Embedded Coder. If you want standalone execution fr...

4 months ago | 1

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Answered
I have problem with derivative of an Input to Simulink-PS Converter
The Derivative block is very sensitive to the time steps your simulation is taking, and is usually not recommended. I'd sugg...

4 months ago | 0

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How can I make the simulink model run autonomously on the card without the need to have it connected to my PC?
You should be able to do this with the <https://www.mathworks.com/hardware-support/raspberry-pi-simulink.html Simulink Support P...

4 months ago | 0

Answered
Variablen in Simulink definieren (ohne Matlab)
My answer is in English, I hope it is OK... Have you looked into the model callbacks of that model? This is typically where M...

4 months ago | 0

Answered
SImulink do not terminate
Yes. You should reduce the amount of logged data in the Data Import/Export section of the model's configuration parameters. Ther...

4 months ago | 0

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Answered
Where are the other equations in my simscape block?
As your error message states: Node TemperatureIncrease.B is possibly missing a branch statement for domain variable ...

5 months ago | 0

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Answered
I am trying to start parpool with 4 workers but when I execute parpool(4) it only connects me to one worker. Can you provide help regarding this?
You can check the maximum number of computational threads by typing the following in MATLAB. >> maxNumCompThreads Is the...

5 months ago | 0

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