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Sam McDonald

MathWorks

Last seen: 5 years ago |  Active since 2016

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I'm an Application Support Engineer at MathWorks and a Mechanical Engineer by education.

I enjoy recording/mixing new music and outdoor exploration.
Professional Interests: MATLAB and Simulink

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I have to simulations runing side by side one as a simulation and other on a real time PLC so the problem I am facing is to run both the simulation simultaneously. Is there any way to do it?
If you are interested in real-time testing using your PLC target hardware, we recommend using Simulink Real-Time to deploy your ...

7 years ago | 0

Solved


Add two numbers
Given a and b, return the sum a+b in c.

7 years ago

Answered
Animating collision GUI - changing position
There are a few techniques for creating animations in MATLAB. Refer to these links for examples: <https://www.mathworks.com/h...

7 years ago | 0

Answered
Trimming multiple plots down to same time frame
I see two options. You can either 1) plot all the data and simply set the axis limits to only show the data you want to, or 2) t...

7 years ago | 0

Answered
How to find dc motor parameters
I am not positive on how you convert the motor specifications to the needed DC motor parameters in the Driveline example. There ...

7 years ago | 1

Answered
Multi-mass, damper, spring system in matlab
A solver like "ode45" would be the correct choice for a problem like this. It takes a function handle as its first argument of t...

7 years ago | 0

Answered
Error in SOR function.
I am able to execute the code you provided with no errors. You may have another function called "SOR" on your MATLAB path tha...

7 years ago | 0

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Answered
the dialog box "getting started"
You can always navigate to the Getting Started page in the MATLAB documentation, which can be found on the MathWorks website or ...

7 years ago | 0

Answered
Undefined function 'trapmf' for input arguments of type 'double'.
Installation of thrid-party software may have currupted the MATLAB installation. A re-installation of MATLAB solves this issue

7 years ago | 0

Answered
Looking for the correct way to go about a Differential Equation in Matlab
If you want to solve this numerically, you will want to use a numerical solver like "ode45" instead of a symbolic solver like "d...

7 years ago | 0

Answered
Undefined function 'trapmf' for input arguments of type 'double'.
From what you have described, it does appear that your trial has expired, or at least MATLAB registers that the trial has expire...

7 years ago | 0

Answered
TwinCopter modeling // DOF regarding quad frame
You will need to place a 6-DOF Joint block connecting the World Frame and the body of the TwinCopter. The reference frame on the...

7 years ago | 0

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Answered
How to fix an error when trying to create a geometry for PDE?
Use geometry functions to define the geometry as stated in the documentation: <https://www.mathworks.com/help/pde/ug/create-g...

7 years ago | 0

Answered
Matlab/ Simulink support for AUTOSAR naming convention
As mentioned in the <https://www.mathworks.com/help/ecoder/autosar/autosar.api.validatemodel.html documentation page>, the "auto...

7 years ago | 0

Answered
ginput turning off cursor R2016a
The cursor does disappear, but you should be able to see the crosshairs that appear once you move the mouse. If those are not be...

7 years ago | 0

Answered
How can I make the labels of components in appdesigner use the latex interpreter?
This is a limitation of App Designer. There is currently no way of setting a latex interpreter for text boxes. As somewhat of...

7 years ago | 2

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Answered
Matlab very slow to startup in SCIF with no network access
Here are a few steps you can try: 1. Use the "timing" run-time option to get more information about which specific portion of...

7 years ago | 0

Answered
How to access the derivative of my Simulink states through the command model(t,x,u,'derivs')
You will need to compute the outputs of the model prior to computing the derivatives. The is likely the cause of you seeing the ...

7 years ago | 0

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Answered
how can i create RMS and frequency detector?
The following links may be useful for you: Documentation page for RMS block in the DSP System Toolbox: <https://www.mathworks...

7 years ago | 0

Answered
Plot a bifurcation diagram for a 2 parameter family of 1D maps
I will address the plotting issues. There are two reasons for not seeing anything plotted. 1. Your data is outside the x and ...

7 years ago | 0

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Answered
Simscape Multibody 2G // Change the direction of the axis of a joint primitive
The 2nd Generation joint blocks in Simscape Multibody define the primitive along one direction. For example, the Revolute Joint ...

7 years ago | 0

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Answered
GUI figure doesn't move
Assuming you are using GUIDE to build your GUI, this may simply be a limitation of GUIDE or using MATLAB on multiple monitors. A...

7 years ago | 0

Answered
I am using Simscape multibody and would like to limit revolute joint movement between 0 and 90 degrees. How can I do this?
A similar question has been addressed in a previous post concerning this functionality in SimMechanics. The same workaround must...

7 years ago | 1

Answered
Maximum sampling frequency of ANALOG INPUT through Arduino UNO
Although the maximum reading rate for the analog pin is 10 kHz, this speed cannot be guaranteed with serial communication via Ar...

7 years ago | 0

Answered
Graphing the intensity to ultimately integrate and find the area of circles
If you want to extract data out of the image and plot the intensity on your own, I would suggest using the "improfile" function....

7 years ago | 1

Answered
Raspberry Pi Simulink Port Problem
Most error messages in Simulink try to point you to the cause of the issue and give you hints or suggestions to try. Have you tr...

7 years ago | 0

Answered
Plotting function over multiple periods
Since the "fplot" function accepts a symbol expression, you can simply add more symbolic data to it before calling the function....

7 years ago | 0

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Answered
How, in Matlab, can i traverse a tree and save node numbers in a separate matrix in required order?
The code that was attached in the comment does perform the required calculations to construct each M matrix as described in the ...

7 years ago | 0

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Solved


Sort a list of complex numbers based on far they are from the origin.
Given a list of complex numbers z, return a list zSorted such that the numbers that are farthest from the origin (0+0i) appear f...

8 years ago

Solved


Is my wife right?
Regardless of input, output the string 'yes'.

8 years ago

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