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# Gifari Zulkarnaen

### Korea University

39 total contributions since 2019

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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)...

12 dagar 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...

22 dagar ago | 1

| accepted

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...

25 dagar ago | 0

gaplotpareto not supported for this algorithm

28 dagar ago | 0

| accepted

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...

### 0

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...

ungefär en månad 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...

ungefär en månad 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...

ungefär 2 månader ago | 0

Submitted

OpenSees-Matlab Interaction of Truss Example
This is example code on how to interact between OpenSees and Matlab

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...

ungefär 2 månader 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 ...

| accepted

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 ...

Submitted

Linear Dynamic Analysis of MDOF system using ODE
Response computation of linear dynamic (time history) analysis of multi-degree of freedom system using ordinary differential equ...

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....

### 1

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...

### 1

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...

| accepted

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...

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;...

| accepted

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...

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...

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...

| accepted

Nonlinear constraint function with the optimization toolbox
Seems you have extra parameters beside the optimization input variables. See these explanation: https://www.mathworks.com/help...

| accepted

Submitted

Plot Frame Structure
Function for plotting frame/bar structure from node coordinate and element connectivity matrix

Question

How to call variable (with index) using string?
Suppose I have many variables with arbitrary names in my workspace with all same size. I also have an identical logical index fo...

### 3

Question

How to delete axes and tick in figure?
I make a contour plot, and then add another line plot in the same figure. For example: contour(x,y,z) hold on plot(xx,yy) ho...

### 1

The variable Edj appears to change size consider preallocating
The size of your matrix changes at every iteration. Make zero matrix before looping. For example: Edj = zeros(d,n); *edited fo...

| accepted

Solved

Vector creation
Create a vector using square brackets going from 1 to the given value x in steps on 1. Hint: use increment.

Solved

Doubling elements in a vector
Given the vector A, return B in which all numbers in A are doubling. So for: A = [ 1 5 8 ] then B = [ 1 1 5 ...

Solved

Create a vector
Create a vector from 0 to n by intervals of 2.