# 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**

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...

5 days 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...

1 month 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...

1 month 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...

2 months ago | 0

| accepted

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...

2 months 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...

2 months 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...

2 months 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...

2 months 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...

2 months 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...

2 months 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...

2 months 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,...

2 months 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...

2 months 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...

2 months ago | 0

| 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....

2 months 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...

2 months 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...

3 months 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...

3 months ago | 0

| 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"....

3 months 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...

3 months 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)

3 months 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...

3 months 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...

3 months ago | 0

Simulink asynchronous generator voltage input clarification

Hi Abd, For an induction machine to operate, you must be able to generate a rotating field on both the rotor and stator. The fi...

3 months ago | 1

| accepted

What is the difference between in64, int32, and int8. Are there anymore 'int' functions? (int means integer right?)

Difference between %d, %f, or any other %? These are formatting control codes. %d prints a number in decimal (base 10) format, ...

11 months ago | 0

| accepted

How to display a Y value

For interactive use of the graph, consider use of the datatips functionality. In R2018 and above, if you hover your cursor over ...

11 months ago | 0

| accepted

index exceeds matrix dimensions and the toolbox code error

I'd guess that n is larger than the size of P. In the first couple lines it seems that P only gets allocated if the swing angle ...

11 months ago | 0

How to apply modifiers to error messages

You've almost got it. The TeX formatting is correct. You need to include the interpreter and modality of the window in a struct ...

11 months ago | 1

| accepted

How to impulse response including unit step function

The Heaviside step function is defined Substitute a logical check on t for u(t). Should be extendable to a shifted step fu...

11 months ago | 0

How Do I Determine which Group Variables Correspond to the Results of SplitApply

Consider using the second argument output from findgroups? [G,ID] = findgroups(A) also returns the unique values for each group...

11 months ago | 0

| accepted