Gifari Zulkarnaen

Korea University

Last seen: plus de 2 ans il y a | Actif depuis 2019

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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...

plus de 3 ans il y a | 1 réponse | 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.

plus de 3 ans il y a | 1

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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...

plus de 3 ans il y a | 1

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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...

presque 4 ans il y a | 0

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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...

presque 4 ans il y a | 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...

presque 4 ans il y a | 0

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

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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,:);

presque 4 ans il y a | 0

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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...

presque 4 ans il y a | 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...

presque 4 ans il y a | 1 réponse | 0

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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 ...

presque 4 ans il y a | 0

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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)...

presque 4 ans il y a | 1

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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...

presque 4 ans il y a | 2

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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...

presque 4 ans il y a | 0

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gaplotpareto not supported for this algorithm
Have you tried this advice? https://www.mathworks.com/matlabcentral/answers/63086-gaplotpareto-for-3-objective-functions

presque 4 ans il y a | 0

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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...

environ 4 ans il y a | 1 réponse | 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...

environ 4 ans il y a | 0

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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...

environ 4 ans il y a | 0

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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...

environ 4 ans il y a | 0

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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...

environ 4 ans il y a | 0

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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 ...

environ 4 ans il y a | 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 ...

environ 4 ans il y a | 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....

environ 4 ans il y a | 1 réponse | 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...

environ 4 ans il y a | 1 réponse | 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...

environ 4 ans il y a | 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...

environ 4 ans il y a | 1

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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;...

environ 4 ans il y a | 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...

environ 4 ans il y a | 0

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Add legend to each figure()???
You need to make the x and y data separately, like this: figure(1) plot(x,P1) hold on plot(x,P2) plot(x,P3) plot(x,TotalDe...

environ 4 ans il y a | 0

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Summing up the answers in for loop that meets criteria
Try this criteria=zeros(220,1) for n = 1:220 pfc = A(combi(n,1),1:270); fef = B(combi(n,2),1:270); zpfc = zscore(pfc); zf...

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Gifari Zulkarnaen

Korea University

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