Community Profile

# Peter O

### Automotive Industry

Last seen: Today Active since 2011

Primarily specializing in electrical systems and optimization for MATLAB and Simulink.

Programming Languages:
Python, C++, C, Javascript, MATLAB, HTML, CSS, Arduino, Shell, Fortran

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Why does differentiating PID feedback break the system?
Numerical differentiation is a very tricky thing to get right for a lot of controls cases. The reason is because unless you have...

How to use python code with numpy in Matlab?
To my knowledge, the Anaconda distribution remains an unsupported version of Python for MATLAB. Numpy fails with Anaconda becaus...

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In wind turbine with induction generator system, I keep getting NAN EM torque. How to fix this?
So you're generating, fixing the rotor speed of the machine to 1.09 per unit and supplying the machine from an infinite 3-phase ...

convert 12 hour data to 24 hour datetime data for timetable
Once imported, you could query the AM/PM column, and if the answer is PM, add 12 hours to the value, and then delete the AM/PM c...

How to stop simulink from terminating with position violation error?
Wrap it in a try catch block? %for loop try % set_param calls and stuff... outs = sim('model', ...) catch disp...

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write a Program to model random motion of electron
You can use randi to place the 'electrons' at random points on the grid by picking the grid indexes at random. The distribution ...

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To confirm, you're saying that result of importing the file as UINT8 is double the array size as importing as UINT16? That's to ...

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Solved

The Piggy Bank Problem
Given a cylindrical piggy bank with radius g and height y, return the bank's volume. [ g is first input argument.] Bonus though...

ungefär ett år ago

How to plot recursive definition in Matlab/Simulink?
Sure. Use a while loop and call functions for each. However, for this problem, consider using a for loop. It will be much more e...

mer än ett år ago | 0

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How to simulate a limit switch in SIMULINK?
Try something like this. It's a little quickly done, so I'm sure there's room for optimization or elegance, but this works. You...

mer än ett år ago | 1

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How to create pulsed sine waves in SIMULINK - that turns off at intervals?
Assuming that the sine wave is allowed to restart at an arbitrary position, I think the cleanest way might be route the sine wav...

mer än ett år ago | 0

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random select n elements from n arrays
With a little programming and a for loop you can handle all possible combinations. If you want to be able to draw repeated ele...

mer än ett år ago | 0

I am not able to understand how to implement this into simulink.
Fortunately, that current map looks very smooth. Consider using the 2D lookup block: https://www.mathworks.com/help/simulink/slr...

mer än ett år ago | 0

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how to do model prediction using python in matlab
So it looks like it's launching into Python fine. A couple things to try: Standard Python or Anaconda? Sometimes Anaconda doesn...

mer än ett år ago | 0

Derivative of state '1' in block 'model4/PMSM /Integrator' at time 1.09996 is not finite
This error can occur when the feedback loop creates positive feedback. As you step through time your derivative input into the i...

mer än ett år ago | 0

Multi phase motor with more than one FEM-Parameterized Rotary Actuator ?!?
Federico. A two or three phase machine is better expressed using a machine model such as the ones found in the Simscape Electri...

mer än ett år ago | 0

Problem with fmincon in case of using variables have various order
Ghost, Good observations. Yes, c has the greatest sensitivity. Sometimes it's possible to get a better fit by massaging the in...

mer än ett år ago | 0

Segmentaion fault while calling Python script using system()
A couple thoughts: Regarding your python call: are you on a recent version of MATLAB? You can call the script directly using MA...

mer än ett år ago | 0

How to fit integral function
Hi, A couple things I notice: integral2 expects max and min bounds, but you're passing it the entire grid. Instead of x and y,...

mer än ett år ago | 0

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store data from different structures into one variable
Hi, Yes this is very possible to do. Are are 320 values stored as a vector in the acc field? If so, try using the arrayfun to l...

mer än ett år ago | 0

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Move diary in file to newfolder
Hi Armin, Try this at the start of your code. You may need to ensure the path exists before creating the diary file. You should...

mer än ett år ago | 0

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Start Simulink Simulation non-blocking with outputs
Hi, Yes sim is a blocking command. You can configure a simulation to dump its output to the workspace and access it from there....

mer än ett år ago | 0

Detecting a local minima within a specific splice of data
I'm very unfamiliar with ECGs. Two ideas: Is the Q peak always the "lowest"? Flip/Invert the signal to search for the peak of Q...

mer än ett år ago | 0

Hi, I'm having trouble solving a non-liner 2nd order ODE, could someone help me? I'm not able to assemble the code.
Ah, this is a nice heat transfer homework problem! The function you're looking for in MATLAB for coding up the solution is calle...

mer än ett år ago | 0

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Increasing datatip display precision (MATLAB 2019a)
Quick and dirty way (works in 2021, I think should still work in 2019): Create a data tip and right-click on it. Edit content a...

mer än ett år ago | 2

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missing parameter to change fixed step size via code
CurrentTimeStep = get_param(gcs, 'FixedStep'); set_param(gcs,'FixedStep','0.1') gcs is a MATLAB call for "get current system"....

mer än ett år ago | 0

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From workspace does not receive data properly.
Are you using the auto solver? What is the smallest timestep taken at the start? It's possible that the solver needs to be confi...

mer än ett år ago | 0

Accessing specific values in every matrix in a cell array
Sure, use cellfun: A = {[1,2,3],[4,5,6],[7,8,9];[10,11,12],[13,14,15],[16,17,18]}; B = cellfun(@(x) x(3), A) disp(B)

mer än ett år ago | 1