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# Gifari Zulkarnaen

### Korea University

Last seen: 約1年 前 2019 年からアクティブ

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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...

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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.

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...

2年以上 前 | 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...

2年以上 前 | 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...

2年以上 前 | 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...

2年以上 前 | 0

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

2年以上 前 | 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,:);

2年以上 前 | 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...

2年以上 前 | 0

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...

2年以上 前 | 1 件の回答 | 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 ...

2年以上 前 | 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)...

2年以上 前 | 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...

2年以上 前 | 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...

2年以上 前 | 0

gaplotpareto not supported for this algorithm

2年以上 前 | 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...

2年以上 前 | 0 件の回答 | 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...

2年以上 前 | 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...

2年以上 前 | 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...

2年以上 前 | 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...

2年以上 前 | 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 ...

2年以上 前 | 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 ...

3年弱 前 | 0

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....

3年弱 前 | 1 件の回答 | 0

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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...

3年弱 前 | 1 件の回答 | 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...

3年弱 前 | 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...

3年弱 前 | 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;...

3年弱 前 | 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...

3年弱 前 | 0