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Andreas Apostolatos

Last seen: 1日 前 2020 以来アクティブ

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 an 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.

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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 ...

8日 前 | 1

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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)...

2ヶ月 前 | 0

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

2ヶ月 前 | 0

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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...

2ヶ月 前 | 1

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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...

2ヶ月 前 | 0

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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...

4ヶ月 前 | 0

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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...

4ヶ月 前 | 1

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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...

4ヶ月 前 | 0

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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...

6ヶ月 前 | 1

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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...

7ヶ月 前 | 1

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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...

8ヶ月 前 | 0

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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'. ...

8ヶ月 前 | 0

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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...

9ヶ月 前 | 0

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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...

9ヶ月 前 | 0

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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...

9ヶ月 前 | 0

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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...

11ヶ月 前 | 0

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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...

11ヶ月 前 | 1

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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...

12ヶ月 前 | 1

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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...

約1年 前 | 0

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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...

約1年 前 | 0

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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...

約1年 前 | 0

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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...

約1年 前 | 1

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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...

約1年 前 | 1

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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 ...

約1年 前 | 0

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

約1年 前 | 1

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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年以上 前 | 0

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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年以上 前 | 1

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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年以上 前 | 2

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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年以上 前 | 1

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

1年以上 前 | 1

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