Andreas Apostolatos

Last seen: en dag ago | 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.

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Courseware on Finite Element Methods
Courseware on the application of the Finite Element Method (FEM) for the numerical approximation of shear-deformable beams and p...

ungefär en månad ago | 40 downloads |

Answered
How do you take the partial derivative of a function relative to theta dot
Hi Cason, You can achieve this workflow by substituting the symbolic expression diff(theta1) with a symbolic variable theta1d...

6 månader ago | 1

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Gaussian quadrature with change of variables
Hi Melanie, There are serveral submissions on File Exchange that you can use to compute integrals using the Gauss Quadrature ...

6 månader ago | 0

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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 ...

11 månader ago | 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)...

ungefär ett år ago | 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/...

ungefär ett år ago | 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...

ungefär ett år ago | 2

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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...

ungefär ett år ago | 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...

ungefär ett år ago | 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...

ungefär ett år ago | 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...

ungefär ett år ago | 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...

mer än ett år ago | 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...

mer än ett år ago | 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...

mer än ett år ago | 0

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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'. ...

mer än ett år ago | 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...

mer än ett år ago | 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...

mer än ett år ago | 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...

mer än ett år ago | 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...

nästan 2 år ago | 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...

nästan 2 år ago | 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...

nästan 2 år ago | 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...

nästan 2 år ago | 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...

ungefär 2 år ago | 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...

ungefär 2 år ago | 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...

ungefär 2 år ago | 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...

ungefär 2 år ago | 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 ...

ungefär 2 år ago | 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://...

ungefär 2 år ago | 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...

ungefär 2 år ago | 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....

ungefär 2 år ago | 1