# Mitsu

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**Content Feed**

Question

Why do EOPs affect both ECI and ECEF in the Orbit Propagator simulink block?

I am using an Orbit Propagator (https://au.mathworks.com/help/aeroblks/orbitpropagator.html) in Simulink. According to the docu...

10 months ago | 0 answers | 0

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answersQuestion

Why does num2str() of 138.97 return 138.96999999999999886?

I use num2str to set parameters into a Simulink model via set_param. The parameters are sometimes irrational fractions (hence ...

10 months ago | 1 answer | 0

### 1

answerQuestion

How does using same variables for both objective and constraints affect optimization results?

I am running problems with fmincon. I usually work with 3 variables ceq = [a,b,c] as constraints that I want to be zero. While ...

11 months ago | 1 answer | 0

### 1

answerQuestion

Recommended approach to "resetting" the workers for each new parallel computation?

Every time I run a script, I want the parallel computation to be ran smoothly, regardless of any previous tasks the workers were...

11 months ago | 1 answer | 1

### 1

answerQuestion

Difference between SQP and Active Set? I thought active set was a method used within SQP

I believe SQP is a method that iteratively solves QP subproblems. When solving QP problems, one has to deal with inequality con...

12 months ago | 1 answer | 1

### 1

answerQuestion

What is the sample time of discrete blocks that inherit from a 0-sample-time continuous signal block?

Picture a simple Simulink model with a sine wave function of sample time set to 0. This is connected to a Unit Delay block with...

12 months ago | 0 answers | 0

### 0

answersMatlab and SPICE toolkit and parfor

When using SPICE libraries, I run the cspice_furnsh function for each parallel thread before the parfor loop where they will be ...

1 year ago | 2

Question

Count instances of subarray inside array

For an array A = [2,2,2,2]; I would like to count how many times [2,2] appears in A, using each value only in one possible pa...

1 year ago | 1 answer | 0

### 1

answerQuestion

How to store 2D arrays in a for loop inside a parfor loop?

I compute e.g. a 3x1 array inside the inner for-loop. In each iteration of this loop, the 3x1 array is saved in a matrix. At th...

1 year ago | 1 answer | 0

### 1

answerQuestion

Is this combination of parfor and global variables prone to errors?

In the main script mainScript.m, a parfor loop goes through N cases. In each case of the parfor loop, the function principalFu...

1 year ago | 1 answer | 0

### 1

answerwhy are my graphs not publishing?

Firstly, For problem 3 and problem 4, you can solve your issue by adding hold on after you define the figure. So instead of f...

1 year ago | 0

Question

Is there a way to overlap two markers on the same legend label?

In the plot, I resort to plot(x, y, 'bx' , 'DisplayName', 'Data label'); plot(x, y, 'bo' , 'HandleVisiblity'); In the legend,...

1 year ago | 0 answers | 0

### 0

answersQuestion

Open .m files in current MATLAB instance from Windows Powershell

I am trying to open matlab files via matlab file.m from Windows PowerShell, so that I can proceed to edit them in MATLAB. Howeve...

1 year ago | 1 answer | 0

### 1

answerQuestion

How to deal with two ode events triggered together?

I run an ode() with an event function that contains multiple conditions. Sometimes, event 1 is triggered alone, sometimes event...

2 years ago | 0 answers | 0

### 0

answersQuestion

How to prevent plotted contents to spill outside of the axes lines

Using set(gca, 'Layer', 'top') I end up with this: Is there a way to completely hide plotted contents that appear beyond t...

2 years ago | 1 answer | 0

### 1

answerQuestion

Is there a one-line code for this?

% I would like to go from A = [1 1;2 2;3 3;4 4;5 5] % to A = [1 1;2 2;3 3;4 4;5 5;1 2;2 3;3 4;4 5;5 6]; ...

2 years ago | 1 answer | 0

### 1

answerQuestion

Why does the Simulink point-mass high-precission orbit propagator increase semi-major axis over time?

I am using the "Orbit Propagator High precision" built-in Simulink block. I have set the gravity model to point-mass, and the i...

2 years ago | 0 answers | 0

### 0

answersQuestion

Simulink: Is there a difference between Keplerian propagator and point-mass high precision propagator?

In order to see the difference between the fast yet simple propagator and the high-precision propagator of Simulink, I created a...

2 years ago | 0 answers | 0

### 0

answersSolved

Is my wife right? Now with even more wrong husband

Again, as in "Is my wife right?" ( <http://www.mathworks.com/matlabcentral/cody/problems/149-is-my-wife-right> ), answer 'yes' r...

2 years ago

Solved

Back to basics 9 - Indexed References

Covering some basic topics I haven't seen elsewhere on Cody. Given an input matrix and row and column, output the index of th...

2 years ago

Solved

Times 2 - START HERE

Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

2 years ago

Question

Record best solution in each GA generation running with UseParallel=true

Hello, Is there a way to record the best solution at each generation running with parallelization? (that is, with UseParallel=1...

2 years ago | 1 answer | 1

### 1

answerQuestion

How can one pass arguments to a custom CrossoverFunction in ga?

Hello, I am implementing a custom crossover function following the documentation. I need to pass 2 additional variables along ...

2 years ago | 1 answer | 0

### 1

answerQuestion

Is it bad practice to have nonlinear constraints array change size depending on the input solution in a genetic algorithm?

In a nonlinear ga, the nonlin constraint function is evaluated with each solution, and the output is [c,ceq]. These arrays conta...

2 years ago | 1 answer | 0

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answerQuestion

Is slicing one big matrix more efficient than storing smaller matrices in a struct?

An example of the former would be: % allcases = % % +---------+------------+------------+------------+-----+-------------+ ...

2 years ago | 1 answer | 0

### 1

answerQuestion

Efficient way/best practice to slice array under a logical condition as well as other conditions

I did not know how to properly title this question, so please bear with me. Simply put, with the following two arrays: A = [0 ...

2 years ago | 1 answer | 0

### 1

answerQuestion

How do MATLAB workers/PC cores divide the work in a parallelized optimization inside a parfor loop?

For example: parfor i = 1:20 options = optimoptions('ga','UseParallel',true,'UseVectorized',false); x = gamultiobj(Ob...

3 years ago | 1 answer | 0

### 1

answerQuestion

Polar plot points appear on wrong position

Hello, I am plotting values in an array of three parameters (angle, radius, and third parameter which is colored) points with a...

3 years ago | 1 answer | 1

### 1

answerQuestion

How can I show radial ticks and axis on top of a polar plot?

Although not a MWE, this is what the code looks like: figure; polaraxes; hold on; polarscatter(vara,varb,[],varc,'.'); c =...

3 years ago | 2 answers | 0