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Andreas Apostolatos

Last seen: Today Active since 2020

Andreas holds a diploma in Applied Mathematics with specialization in Applied Mechanics and Statistics from the National Technical University of Athens. Andreas spent his semester abroad in Prague, Czechia, where he wrote his Diploma Thesis at the Chair of Mathematical Modeling at the Charles University in Prague. Due to his passion about numerical methods in engineering, Andreas completed master studies with honors in Computational Mechanics and doctoral studies with highest distinction in Computational Engineering at the Technical University of Munich. Andreas currently works as a Senior Application Engineer in Education at MathWorks and he is specialist for the preparation of courseware in science and engineering. On the same time, Andreas teaches as visiting lecturer at the Technical University of Munich about data-driven computational engineering.

Spoken Languages:
English
Professional Interests:

Statistics

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Answered
calculate the classification accuracy after training a "pretrained model"
Hi Rayan, From the code snippet you share it appears that you are training a neural network for classification while you are ...

3 months ago | 1

| accepted

Answered
how can i validate my optimization algorithm?
Hi Harsh, From your description I understand that your cost function f depends on (x,y), namely f = f(x,y) and that f(10, 20)...

5 months ago | 0

Answered
Can matlab work with rosetta?
Hi, MATLAB interfaces smoothly to Python, see the following documentation page, https://www.mathworks.com/products/matlab/...

5 months ago | 0

Answered
Configure Matlab for GIT on Windows
Hi Rocco, The step of installing Cygwin and adding it to the MATLAB library path is just an optional step in case you want to...

5 months ago | 1

| accepted

Answered
Eig Argument Command Error
Hi, The issue here is that you are defining matrices K and M as symbolic matrices, whos K M Name Size B...

5 months ago | 0

Answered
Not Enough Input Argument Error
Hi, It is yet not clear what kind of error you are receiving, since you have not shared it with us. However I understand that...

7 months ago | 0

| accepted

Answered
Why program shows Unrecognized function or variable 'g'.
Hi, In the following call of your code snippet, plot(x,y,'bd-',x,h,'g:',x,w,'ro-',x,g,'c^-'); you are trying to plot va...

7 months ago | 1

| accepted

Answered
I would like to run Matlab on Centos 8. is there any way?
Hi, Please refer also to the following MATLAB Answers post accordingly, https://de.mathworks.com/matlabcentral/answers/452...

7 months ago | 0

Answered
Regression Learner and 1 layer Neural Network Model parameters
Hi, The source of the discrepancy in this case comes from the fact, that you are performing the "manual" forward pass without...

9 months ago | 1

| accepted

Answered
Interactive brushing across multiple scatter-plots on the same dataset (data relation given not by a common x-axis but just by the dataset)
Hello, You can use the following code snippet for your needs, %% Just some viusally instructive, artificial sample data n...

10 months ago | 1

| accepted

Answered
weird latex-interpreter problem in annotation when adding one line to table
Hello everyone, This post is already a little bit old, but I would like to provide with some information in case somebody els...

11 months ago | 0

| accepted

Answered
Matlab Coder Code check fails with "Error calling ... This call-site expects more outputs than this function can supply"
As mentioned above, the issue gets resolved if you remove the declaration of the optimization options variable as 'persistent'. ...

11 months ago | 0

| accepted

Answered
NATIVE-DECLARATION generated by embedded coder wrong
Hi, I would like to follow-up on this question, in case someone else stumbles upon the same issue. For the <NATIVE-DECLARA...

12 months ago | 0

Answered
Error solving piecewise system of equations
Hi Jeremy, Adding to the excellent recommendation of Walter, there is also the possibility to use function 'fsolve()' to solv...

12 months ago | 0

Answered
How can I use a probability distribution object in a Stateflow chart?
Hi, Firstly please note that Simulink is under the hood generating and compiling code when you build and run a model. The Cod...

1 year ago | 0

Answered
How to install matlab in Manjaro Linux?
Hello, Each MATLAB release is only supported for a subset of Linux distributions. For instance, the list of the Linux distrib...

1 year ago | 0

| accepted

Answered
Solve 2D Navier stokes Equation Deep Learning
Dear Chris, Function 'fullyconnect' returns only a single output argument, see the following documentation page for more info...

1 year ago | 1

| accepted

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...

1 year 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...

1 year 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...

1 year 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...

1 year ago | 0

| accepted

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...

1 year 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...

1 year 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 ...

1 year 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://...

1 year ago | 1

| accepted

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...

1 year ago | 0

| accepted

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....

1 year ago | 1

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...

1 year ago | 2

| accepted

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...

1 year ago | 1

| accepted

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

1 year ago | 1

| accepted

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