# Peter O

### Automotive Industry

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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**Content Feed**

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...

ungefär ett år ago | 0

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...

ungefär ett år ago | 1

| accepted

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 ...

ungefär ett år ago | 0

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...

ungefär ett år ago | 0

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...

ungefär ett år ago | 0

| accepted

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 ...

ungefär ett år ago | 0

| accepted

fread function for reading 10 bit raw file.

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 ...

ungefär ett år ago | 0

| accepted

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...

mer än 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...

nästan 2 år ago | 0

| accepted

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...

nästan 2 år ago | 1

| accepted

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...

nästan 2 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...

nästan 2 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...

nästan 2 år ago | 0

| accepted

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...

nästan 2 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...

nästan 2 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...

nästan 2 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...

nästan 2 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...

nästan 2 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,...

nästan 2 år ago | 0

| accepted

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...

nästan 2 år ago | 0

| accepted

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...

nästan 2 år ago | 1

| accepted

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....

nästan 2 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...

nästan 2 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...

nästan 2 år ago | 0

| accepted

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...

nästan 2 år ago | 3

| accepted

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"....

nästan 2 år ago | 0

| accepted

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...

nästan 2 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)

nästan 2 år ago | 1

Use EV Battery Cooling System

It sounds like the file is not on MATLABs search path. https://www.mathworks.com/help/matlab/matlab_env/what-is-the-matlab-searc...

nästan 2 år ago | 0

How do you create a matrix Aij where each value is determined by a formula?

It sounds like a for loop would build your matrix nicely: n = 2000; sz_i = n; sz_j = n; A = zeros(sz_i, sz_j); % Preallocate...

nästan 2 år ago | 0