# George Papazafeiropoulos

Major, Infrastructure Engineer, Hellenic Air Force Civil Engineer, M.Sc., Ph.D.

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**Content Feed**

Can global optimization toolbox-GA 'ga'function optimization many values at the same time?

Please check the gamultiobj function

8 months ago | 0

How to apply neural networks for multiple experimental data

Dear Bharat, I have checked your code segment and I have assigned arbitrary values to the variables that are undefined in it. I...

4 years ago | 0

Run Abaqus cmd from MATLAB command line

You can execute the following Matlab code in Windows: try system(['abaqus cae noGUI=model.py interactive']) %...

6 years ago | 0

how to call abaqus using matlab for iterative process?

You should access the abaqus results (*.fil) file via MATLAB. In order to take your results into a fil file you should specify...

6 years ago | 0

Negative eigenvalues with frequency analysis related to ABAQUS

Dear Xiaohan, You can perform the eigenfrequency analysis in Abaqus as usual and then extract the analysis results using Abaq...

6 years ago | 0

How to call abaqus from matlab？

!abaqus job=job_1 without the extension (*.inp). If you want to obtain the results of this analysis back to Matlab, then you hav...

6 years ago | 0

Abaqus and Matlab (Optimising the simulation parameters in Matlab by calling Abaqus as external subroutine)

You can use the new toolbox developed to serve as an interface between Abaqus and Matlab, which is Abaqus2Matlab. With this tool...

6 years ago | 0

How to do this: Multivariate Interpolation with random data (non-gridded)

vq = griddata(x1,x2,y,x10,x20) hth, George Papazafeiropoulos

9 years ago | 0

how to write the nonlinear constraints in fmincon

Define the constraint function as follows: function [C,Ceq]=confun(x) F1=... F2=... F3=... F4=... F5=... ...

9 years ago | 1

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I have n points (x ,y coordinates known) of two parallel lines (not perfect straight ) want to draw lines from first boundary points to second boundary with proper slope . Also want to find min & max distance between the lines.

BOUN1=[ 191 220 189 221 188 222 186 223 186 224 185 225 185 226 185 227 185 228 186 229 187 230 187 231 187 232 187 233 187 23...

9 years ago | 0

How to solve linear and non linear equation system?

For 14 equations with 14 unknowns, try fsolve, or any other iterative solver (Newton-Raphson, Arc-Length, line search, etc...) ...

9 years ago | 0

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Defining a function (including vector dot product) for all the points in 3D

% data dx = 0.1; dy = 0.5; dz = 0.1; [x, y, z] = meshgrid( (1:100)*dx, (1:100)*dy, (1:100)*dz ); X = [x(:) y(:)...

9 years ago | 0

Remove NaN from a matrix

ind=sum(~isnan(B)); B(isnan(B))=0; mean=sum(B)./ind

9 years ago | 2

find min or max value element from more than two matrices

% data matrix1=rand(2); matrix2=rand(3); matrix3=rand(4); % engine c=nan(4,4,3); c(1:2,1:2,1)=matrix1; c(...

9 years ago | 1

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How to get the output to a variable

Try this after running your code: fit1.Constant fit1.GARCH{1} fit1.ARCH{1} fit1.Offset

9 years ago | 1

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how to select higher value in a matrix and change that by introducing an error?

Are you looking for something like this? a= [ 0.83 0.85 0.97 0.1 0.95 0.93 0.2; 0.2 0.12 0.12 0.76 0.77 0.78 0.25; ...

9 years ago | 1

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i want to save all the value of variable a from all iterations into a single matrix ?

% initial data f=[1 3 5 7 9 11; 2 4 6 8 10 12]; b=[1 2;3 4]; % engine b=b'; [nn,n]=size(f); [m,c]=size(b...

9 years ago | 0

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Draw a line on a 2D plot at a particular x and y values

x=linspace(0,4); y=x.^2; plot(x,y); line([3;3],[0;9],'linestyle','--'); line([0;3],[9;9],'linestyle','--');

9 years ago | 2

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how to use multiple linear equality constraints

Convert them into matrix form and look about the input arguments Aeq and Beq in the documentation of fmincon.

9 years ago | 1

Extend a vector by extending its elements

If X is a column vector: % initial data d=10; % engine X=(1:d)'; ind=ones(d^2,1); ind(d+1:d:d^2)=1-d; % r...

9 years ago | 0

How to detect if a line intersects with itself?

% initial data A = [1 1; 1 2; 2 2; 2 1; 3 1]; tour_order = [2; 1; 4; 3; 5; 2]; % engine sizeA=size(A,1); meanA=...

9 years ago | 0

Testing for an Integer and displaying that value.

% initial data ll=99; ul=500; f=5; % engine lb=floor(ll/f); if lb/2~=floor(lb/2) lb=lb+1; end r...

9 years ago | 0

Reduce dimensionality using indices

This is an alternative solution which does not contain external functions, thanks to Jos! % initial data A=ceil(10*rand(...

9 years ago | 1

Reduce dimensionality using indices

After specifying A... d=[1 2 3; 1 1 3; 2 1 1]; B=zeros(3,3,3); B(:,:,1)=(d==1); B(:,:,2)=2*(d==2); ...

9 years ago | 0

Multiple linear regression nonlinear constraints with fmincon

As an example for doing this, I give you an example. Define a function as follows: function er = objfun(a) global y x ...

9 years ago | 0

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Help me about the error with symsum function to calculate the sum of series ?

Maybe because there is not any analytical formula which gives this sum. Can this function be integrated in an analytic way? I su...

9 years ago | 0