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Andreas Apostolatos

MathWorks

Last seen: 1 day ago Active since 2020

Born in Athens, Greece, Andreas completed his Diploma studies in Applied Mathematics with focus in Applied Mechanics and Statistics at the National Technical University of Athens having given the opportunity to complete his Diploma Thesis on Contact Mechanics at the Charles University in Prague, Czech Republic. He then completed master studies in Computational Mechanics and doctoral studies in Computational Engineering at the Technical University of Munich with focus on the integration of Design and Analysis for surface coupled problems. During his postdoctoral research Andreas was mainly occupied with uncertainty quantification and stochastic optimization for high-rise buildings subject to wind. In his free time, Andreas enjoys cycling, swimming and sailing.

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Answered
minimize tool bar lost
Hi Jose, Select the option "Layout" on the right of the toolstrip in the "HOME" tab, and then choose from the "SELECT LAYOUT...

4 days ago | 1

| accepted

Answered
How to multiply two symbolic matrices fully?
Hi Igor, I understand that you are seeking to have the components of the resulting matrix from the multiplication expanded. Y...

2 months ago | 0

| accepted

Answered
Objective function is returning undefined values at initial point. lsqcurvefit cannot continue.
Hi Eren, Welcome to the forum from me as well. The code snippet you shared cannot be executed because variable 'x' is nowh...

2 months ago | 0

Answered
Polyspace justifications added inside the code not available in generated polyspace reports
Hello everyone, The cause of the issue was that the code annotation was added one line above the line of code that resulted i...

2 months ago | 0

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Answered
problem using 'Solve' (return only 1 solution)
Hi Marco, It is not clear how you define expression 'equazione_gamma', but by reverse engineering your call to function 'root...

2 months ago | 1

| accepted

Answered
Pareto set for 2D functions
Hi Laura, You are on the right path, but I would have some recommendations for you accordingly: 1.) When using function 'f...

2 months ago | 1

| accepted

Answered
hs923a function for Monte Carlo Approx
Hello, Function 'halton' does not appear to be a built-in MATLAB function. However, there is below a link to a custom MATLAB ...

3 months ago | 0

Answered
plotting logarithmic and linear scale
Hello, You can use function 'semilogy' for your needs, please visit the following documentation page accordingly, https://...

3 months ago | 1

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Answered
Obtaining accurate derivatives using Symbolic Math Toolbox
Hello, The evaluations of symbolic expressions that represent analytic derivatives in MATLAB are only governed by round-off e...

4 months ago | 0

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Answered
Minimising coefficients using fminsearch, subject to normalisation condition
Hello, You have an optimization problem at hand, where the objective function is subject to two sets of equality constraints....

4 months ago | 0

Answered
How to substitute x by an integer in a derivative function
Hello, To evaluate symbolic expression 'a' at 'x = 1' you can use function 'subs', namely, a_at_1 = subs(a, 1); I am no...

4 months ago | 2

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Answered
monte carlo random number generation
Hello, It seems that what you are seeking for can be utilized using function 'randsample' when using the variant that takes a...

4 months ago | 1

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Answered
truss problems warning RCOND
Hello, As John mentioned before, your stiffness matrix 'T' is most likely incorrectly computed. Using the latter system th...

6 months ago | 1

| accepted

Answered
How to find indices of certain values from dataset using a loop
Hello, You can use the following code snippet for your purposes: clear; data = readtable('kNN_300_y_pred_wd XYZValue + la...

6 months ago | 0

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Answered
Why am I warned about defining variables in a nested function, when I don't?
Hello everyone, It appears so, that this warning does not persist for release R2019b and later releases when cell array 'ind...

10 months ago | 5

| accepted