Community Profile # Gifari Zulkarnaen

### Korea University

Last seen: 3 months ago Active since 2019

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Question

Is there a way to speed up the time for calling external program?
I am doing optimization problem. The objective function requires to call external program. But time for calling the program (0.1...

1 year ago | 0 answers | 0

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Help !! How to use Genetic Algorithm for maximisation process as it is used for minimisation process?
Make the fitness function to be 1/f(x) where f(x) is your original maximization.

1 year ago | 1

poisson regression using genetics algorithm
I dont really understand statistics and PR, but I think you can define the objective function as a function of PR variables whic...

1 year ago | 1

Error when I run ODE45 function
You might see my example here to solve equation of motion using ODE: https://www.mathworks.com/matlabcentral/fileexchange/74348...

1 year ago | 0

Is there a way to obtain the indices of the training, validation and test datasets in NN pattern recognition?
You can see those indices in the ouput data of train command. [net,tr] = train(net,x,t); % net is trained network, tr in traini...

1 year ago | 0

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What did I do wrong here?
In your function RK4 line 8 to 11, you have two inputs for f function while the f function has only one input value, thus "too m...

1 year ago | 0

how to use reshape ?
try this: B = reshape(A,339,[]); % A is the original matrix, B is the reshaped matrix

1 year ago | 0

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Extract a row from a 2D matrix if any of its element matches with elements in other 1D matrix
Try this: idx = []; for i = 1:size(A,1) if any(ismember(A(i,:),B)) idx = [idx i]; end end C = A(idx,:);

1 year ago | 0

How do I implement multi objective optimization using the default in-built 'particleswarm' function in Matlab ?
https://www.mathworks.com/matlabcentral/fileexchange/62074-multi-objective-particle-swarm-optimization-mopso All credits to the...

1 year ago | 0

Question

Does Matlab has an adaptive Neural Network (architecture and functions)?
In standard learning, we usually do multiple attempts to find the most optimum ANN architecture (nodes and layers) and functions...

1 year ago | 1 answer | 0

### 1

How to solve mass spring damper over frequency (differential equation)?
Equation of motion is time-dependant equation. Perhaps what you mean is Response Spectrum (frequency-based response data)? This ...

1 year ago | 0

Writing an Optimization Problem
I am not sure why yours doesnt work, but it works if the functions are written in array form like this: clear fun = @(x) (x(1)...

1 year ago | 1

exitFlag meaning in GA solver
As I know, good solution is when it converges, the change of few last iteration does not improves (exit flag 1, 3). Or when so...

1 year ago | 1

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Find indexs of minimum in 4-D matrix.
Maybe linear means the index ordered in from high dimension to one dimension. For example, for 2D matrix with 2 rows and 3 colum...

1 year ago | 0

gaplotpareto not supported for this algorithm

1 year ago | 0

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Question

Add new line in middle of line of a text file
I have a bug in my text file. There should be new line at this blue line: I have tried to code to fix this: subdir = 'TCLFil...

1 year ago | 0 answers | 0

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How to fix timestep in this code?
You can check your equation part by part to check whether your code or calculation is correct. For example, for n=2: Ve*dm = 22...

1 year ago | 0

How do I solve an eigenvector for the amplitude matrix 'A' mode
Are you trying to make eigendecomposition of mass & stiffness matrix? Try this: [U,Omega2] = eig(inv(M)*K); % Eigen decomp...

1 year ago | 0

Finding Angle between 2 points
Is this what you mean? P1 = [10 210]; P2 = [140 210]; Z0 = [(P1(1)+P2(1))/2 225]; % Reference point, assuming it is in the m...

1 year ago | 0

Saving / Showing Value of Variables in Genetic Algorithms
This guy here give an example output function to obtain variable in each iteration on a pattern search optimization. Maybe it is...

1 year ago | 0

why points examined in Pattern Search exceed the lower or Upper bounds and is there any way to avoid this?
What is your initial point and initial mesh size? Perhaps these already exceeds your bounds. Edit: Hmm, what if you normalize ...

1 year ago | 0

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How to skip paretosearch iteration
In the objective function, you can put a large penalty or result to make it like a bad result, so pattern search won't consider ...

2 years ago | 0

Question

fprintf can't make new line
I want to edit a line of a text file (tcl file actually). I tried with following code: A = 5; tcl = regexp(fileread('old_file....

2 years ago | 1 answer | 0

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Question

Rotate 3D surface matrices
I have three matrices for surf command: X, Y, Z. I need to rotate the matrices along z-axis by some degrees. I remember there is...

2 years ago | 1 answer | 0

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Finding Rest of Row
Do you mean like vlookup in excel? Try this: data = randi(1,4,5); % Just an example matrix first = data(randi(4),1); % Example...

2 years ago | 0

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Battery charging profile - Most efficient way of plotting
I have suggestion for your long repetitive elseif, try to use this instead: z = randi(100); zLim = [logspace(0,2,9) Inf]; % li...

2 years ago | 1

How to plot graph from equation
I'm not sure what do you want, is it like this? x3 = [1 0.1 0.01 0.001]; x2 = zeros(3,4); for i=1:4 x1 = [-2 1 0;1 -2 1;...

2 years ago | 0

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Error using optimization tool bx
Try this [x,fval] = ga(@objective,6); function f = objective(x) f = -2.84.*x(:,1)+0.22.*x(:,2)+3.33.*x(:,3)-1.09.*x(:,4...

2 years ago | 0